503DESCRIPTION

503.01 DESCRIPTION. This section specifies requirements for the

certification of asphalt concrete plants and paving equipment. It includes methods and equipment for handling and storing materials, producing asphalt concrete, and transporting and placing asphalt concrete at the job site. The Department's publication e ntitled “Application of Quality Assurance Specifications for Asphalt Concrete Mixtures” is hereby made a part of this specification by reference.

503.02 Plant Equipment.

503.02.1 General: Provide equipment and processes to proportion

aggregates, additives and asphalt cement in accordance with the approved Job Mix Formula (JMF). When the automatic adjustments or other critical control and shutoff devices are not functioning, do not operate t he plant. Operate the plant with clean, easily accessible, and accurate thermometers, scales and meters. Immediately repair, replace, or recalibrate equipment when faulty operation is detected. Provide a system with positive weight control of cold aggreg ates fed by a belt scale or other device interlocked with the asphalt measuring system to maintain required proportions of combined aggregates and asphalt cement. Heat, dry and mix aggregates with asphalt cement to produce a homogeneous mixture in which al l aggregate particles are uniformly coated. Use approved methods to discard the first and last output of the plant after each interruption. Place discarded material in a separate dedicated area. Digitally display the total quantities and the rates of prod uction of every material used on a DOTD project.

503.02.2 Certification and Calibrations: The Department will

certify plants furnishing asphalt mixtures every two years with current Departmental procedures or when any major component is repaired, replaced or up graded. The plant owner is required to report any major component upgrades to the District Laboratory Engineer. Forward all documentation available upon request by the Department. All plant components and processes are subject at any time to inspection a nd approval by the District Laboratory Engineer. The plant owner is required Asphalt Concrete Equipment and Processes

503.01 DESCRIPTION. This section specifies requirements for the

certification of asphalt concrete plants and paving equipment. It includes methods and equipment for handling and storing materials, producing asphalt concrete, and transporting and placing asphalt concrete at the job site. The Department's publication e ntitled “Application of Quality Assurance Specifications for Asphalt Concrete Mixtures” is hereby made a part of this specification by reference.

503.02 Plant Equipment.

503.02.1 General: Provide equipment and processes to proportion

aggregates, additives and asphalt cement in accordance with the approved Job Mix Formula (JMF). When the automatic adjustments or other critical control and shutoff devices are not functioning, do not operate t he plant. Operate the plant with clean, easily accessible, and accurate thermometers, scales and meters. Immediately repair, replace, or recalibrate equipment when faulty operation is detected. Provide a system with positive weight control of cold aggreg ates fed by a belt scale or other device interlocked with the asphalt measuring system to maintain required proportions of combined aggregates and asphalt cement. Heat, dry and mix aggregates with asphalt cement to produce a homogeneous mixture in which al l aggregate particles are uniformly coated. Use approved methods to discard the first and last output of the plant after each interruption. Place discarded material in a separate dedicated area. Digitally display the total quantities and the rates of prod uction of every material used on a DOTD project.

503.02.2 Certification and Calibrations: The Department will

certify plants furnishing asphalt mixtures every two years with current Departmental procedures or when any major component is repaired, replaced or up graded. The plant owner is required to report any major component upgrades to the District Laboratory Engineer. Forward all documentation available upon request by the Department. All plant components and processes are subject at any time to inspection a nd approval by the District Laboratory Engineer. The plant owner is required Asphalt Concrete Equipment and Processes

503.01 DESCRIPTION. This section specifies requirements for the

certification of asphalt concrete plants and paving equipment. It includes methods and equipment for handling and storing materials, producing asphalt concrete, and transporting and placing asphalt concrete at the job site. The Department's publication e ntitled “Application of Quality Assurance Specifications for Asphalt Concrete Mixtures” is hereby made a part of this specification by reference.

503.02 Plant Equipment.

503.02.1 General: Provide equipment and processes to proportion

aggregates, additives and asphalt cement in accordance with the approved Job Mix Formula (JMF). When the automatic adjustments or other critical control and shutoff devices are not functioning, do not operate t he plant. Operate the plant with clean, easily accessible, and accurate thermometers, scales and meters. Immediately repair, replace, or recalibrate equipment when faulty operation is detected. Provide a system with positive weight control of cold aggreg ates fed by a belt scale or other device interlocked with the asphalt measuring system to maintain required proportions of combined aggregates and asphalt cement. Heat, dry and mix aggregates with asphalt cement to produce a homogeneous mixture in which al l aggregate particles are uniformly coated. Use approved methods to discard the first and last output of the plant after each interruption. Place discarded material in a separate dedicated area. Digitally display the total quantities and the rates of prod uction of every material used on a DOTD project.

503.02.2 Certification and Calibrations: The Department will

certify plants furnishing asphalt mixtures every two years with current Departmental procedures or when any major component is repaired, replaced or up graded. The plant owner is required to report any major component upgrades to the District Laboratory Engineer. Forward all documentation available upon request by the Department. All plant components and processes are subject at any time to inspection a nd approval by the District Laboratory Engineer. The plant owner is required Asphalt Concrete Equipment and Processes

503.01 DESCRIPTION. This section specifies requirements for the

certification of asphalt concrete plants and paving equipment. It includes methods and equipment for handling and storing materials, producing asphalt concrete, and transporting and placing asphalt concrete at the job site. The Department's publication e ntitled “Application of Quality Assurance Specifications for Asphalt Concrete Mixtures” is hereby made a part of this specification by reference.

503.02 Plant Equipment.

503.02.1 General: Provide equipment and processes to proportion

aggregates, additives and asphalt cement in accordance with the approved Job Mix Formula (JMF). When the automatic adjustments or other critical control and shutoff devices are not functioning, do not operate t he plant. Operate the plant with clean, easily accessible, and accurate thermometers, scales and meters. Immediately repair, replace, or recalibrate equipment when faulty operation is detected. Provide a system with positive weight control of cold aggreg ates fed by a belt scale or other device interlocked with the asphalt measuring system to maintain required proportions of combined aggregates and asphalt cement. Heat, dry and mix aggregates with asphalt cement to produce a homogeneous mixture in which al l aggregate particles are uniformly coated. Use approved methods to discard the first and last output of the plant after each interruption. Place discarded material in a separate dedicated area. Digitally display the total quantities and the rates of prod uction of every material used on a DOTD project.

503.02.2 Certification and Calibrations: The Department will

certify plants furnishing asphalt mixtures every two years with current Departmental procedures or when any major component is repaired, replaced or up graded. The plant owner is required to report any major component upgrades to the District Laboratory Engineer. Forward all documentation available upon request by the Department. All plant components and processes are subject at any time to inspection a nd approval by the District Laboratory Engineer. The plant owner is required every 90 days to have the laboratory gram scales, ignition oven scales, truck platform scales, and weight batchers tested, inspected, and calibrated by a qualified independent sca le service or the Weights and Measures Division, Louisiana Department of Agriculture and Forestry. Within 10 working days of the 90 days plant scale recalibration, the Certified Asphalt Concrete Plant Technician, in accordance with 503.09 , will verify calibration of the plant’s cold feed bins, RAP feed bins, weight bridges, asphalt pump, and additives measuring devices to stated DOTD standards. The Certified Asphalt Concrete Plant Technician shall notify the DOTD certifying District Laborat ory two days prior to plant calibration. Provide a plant site laboratory conforming to 722.02 as a part of the plant facilities at no direct pay, except as modifie d herein. Each plant laboratory shall have a minimum floor space of 400 square feet. Laboratories are to be provided for all Quality Assurance testing. Calibrate, verify and document all laboratory equipment according to the procedures, test methods, an d frequency in accordance with the current “LADOTD Laboratory Equipment Manual.”

503.03 Aggregates.

503.03.1 Stockpiles: Store aggregates at the plant site so that no

intermixing, segregation, pooling of water or contamination will occur. Ensure that gradation and oth er properties of aggregate in stockpiles are combined in proper proportions so that the resulting combined gradation will meet the requirements of the approved JMF.

503.03.2 Cold Feed Bins: Blend and proportion all aggregates in

cold feed bins. Provide cold aggr egate bins of sufficient size to store the amount of aggregates required for continuous plant operation. Provide a cold bin feed system capable of uniformly delivering the maximum number of required aggregate sizes in their proper proportion. Extend part itions between bins a minimum of 1 foot above the top of bins sufficient to prevent intermixing of aggregate sizes. Do not use the partition as part of the bin. Calibrate the cold feed system based on the weight of bin material. Feed material from a bi n through the individual orifice and bypass to a container to be weighed, or over the calibrated weigh bridge. Calibrate material from each bin separately. Calibrate with manufacturer’s recommended procedures and keep records on file. The calibration proc ess shall be part of the contractor's quality control. every 90 days to have the laboratory gram scales, ignition oven scales, truck platform scales, and weight batchers tested, inspected, and calibrated by a qualified independent sca le service or the Weights and Measures Division, Louisiana Department of Agriculture and Forestry. Within 10 working days of the 90 days plant scale recalibration, the Certified Asphalt Concrete Plant Technician, in accordance with 503.09 , will verify calibration of the plant’s cold feed bins, RAP feed bins, weight bridges, asphalt pump, and additives measuring devices to stated DOTD standards. The Certified Asphalt Concrete Plant Technician shall notify the DOTD certifying District Laborat ory two days prior to plant calibration. Provide a plant site laboratory conforming to 722.02 as a part of the plant facilities at no direct pay, except as modifie d herein. Each plant laboratory shall have a minimum floor space of 400 square feet. Laboratories are to be provided for all Quality Assurance testing. Calibrate, verify and document all laboratory equipment according to the procedures, test methods, an d frequency in accordance with the current “LADOTD Laboratory Equipment Manual.”

503.03 Aggregates.

503.03.1 Stockpiles: Store aggregates at the plant site so that no

intermixing, segregation, pooling of water or contamination will occur. Ensure that gradation and oth er properties of aggregate in stockpiles are combined in proper proportions so that the resulting combined gradation will meet the requirements of the approved JMF.

503.03.2 Cold Feed Bins: Blend and proportion all aggregates in

cold feed bins. Provide cold aggr egate bins of sufficient size to store the amount of aggregates required for continuous plant operation. Provide a cold bin feed system capable of uniformly delivering the maximum number of required aggregate sizes in their proper proportion. Extend part itions between bins a minimum of 1 foot above the top of bins sufficient to prevent intermixing of aggregate sizes. Do not use the partition as part of the bin. Calibrate the cold feed system based on the weight of bin material. Feed material from a bi n through the individual orifice and bypass to a container to be weighed, or over the calibrated weigh bridge. Calibrate material from each bin separately. Calibrate with manufacturer’s recommended procedures and keep records on file. The calibration proc ess shall be part of the contractor's quality control. every 90 days to have the laboratory gram scales, ignition oven scales, truck platform scales, and weight batchers tested, inspected, and calibrated by a qualified independent sca le service or the Weights and Measures Division, Louisiana Department of Agriculture and Forestry. Within 10 working days of the 90 days plant scale recalibration, the Certified Asphalt Concrete Plant Technician, in accordance with 503.09 , will verify calibration of the plant’s cold feed bins, RAP feed bins, weight bridges, asphalt pump, and additives measuring devices to stated DOTD standards. The Certified Asphalt Concrete Plant Technician shall notify the DOTD certifying District Laborat ory two days prior to plant calibration. Provide a plant site laboratory conforming to 722.02 as a part of the plant facilities at no direct pay, except as modifie d herein. Each plant laboratory shall have a minimum floor space of 400 square feet. Laboratories are to be provided for all Quality Assurance testing. Calibrate, verify and document all laboratory equipment according to the procedures, test methods, an d frequency in accordance with the current “LADOTD Laboratory Equipment Manual.”

503.03 Aggregates.

503.03.1 Stockpiles: Store aggregates at the plant site so that no

intermixing, segregation, pooling of water or contamination will occur. Ensure that gradation and oth er properties of aggregate in stockpiles are combined in proper proportions so that the resulting combined gradation will meet the requirements of the approved JMF.

503.03.2 Cold Feed Bins: Blend and proportion all aggregates in

cold feed bins. Provide cold aggr egate bins of sufficient size to store the amount of aggregates required for continuous plant operation. Provide a cold bin feed system capable of uniformly delivering the maximum number of required aggregate sizes in their proper proportion. Extend part itions between bins a minimum of 1 foot above the top of bins sufficient to prevent intermixing of aggregate sizes. Do not use the partition as part of the bin. Calibrate the cold feed system based on the weight of bin material. Feed material from a bi n through the individual orifice and bypass to a container to be weighed, or over the calibrated weigh bridge. Calibrate material from each bin separately. Calibrate with manufacturer’s recommended procedures and keep records on file. The calibration proc ess shall be part of the contractor's quality control. every 90 days to have the laboratory gram scales, ignition oven scales, truck platform scales, and weight batchers tested, inspected, and calibrated by a qualified independent sca le service or the Weights and Measures Division, Louisiana Department of Agriculture and Forestry. Within 10 working days of the 90 days plant scale recalibration, the Certified Asphalt Concrete Plant Technician, in accordance with 503.09 , will verify calibration of the plant’s cold feed bins, RAP feed bins, weight bridges, asphalt pump, and additives measuring devices to stated DOTD standards. The Certified Asphalt Concrete Plant Technician shall notify the DOTD certifying District Laborat ory two days prior to plant calibration. Provide a plant site laboratory conforming to 722.02 as a part of the plant facilities at no direct pay, except as modifie d herein. Each plant laboratory shall have a minimum floor space of 400 square feet. Laboratories are to be provided for all Quality Assurance testing. Calibrate, verify and document all laboratory equipment according to the procedures, test methods, an d frequency in accordance with the current “LADOTD Laboratory Equipment Manual.”

503.03 Aggregates.

503.03.1 Stockpiles: Store aggregates at the plant site so that no

intermixing, segregation, pooling of water or contamination will occur. Ensure that gradation and oth er properties of aggregate in stockpiles are combined in proper proportions so that the resulting combined gradation will meet the requirements of the approved JMF.

503.03.2 Cold Feed Bins: Blend and proportion all aggregates in

cold feed bins. Provide cold aggr egate bins of sufficient size to store the amount of aggregates required for continuous plant operation. Provide a cold bin feed system capable of uniformly delivering the maximum number of required aggregate sizes in their proper proportion. Extend part itions between bins a minimum of 1 foot above the top of bins sufficient to prevent intermixing of aggregate sizes. Do not use the partition as part of the bin. Calibrate the cold feed system based on the weight of bin material. Feed material from a bi n through the individual orifice and bypass to a container to be weighed, or over the calibrated weigh bridge. Calibrate material from each bin separately. Calibrate with manufacturer’s recommended procedures and keep records on file. The calibration proc ess shall be part of the contractor's quality control. Provide an automatic plant no flow alarm and shutoff to cease operations when any aggregate bin becomes empty or flow is interrupted for 20 seconds. If repeated no flow indications are evident, cease operations until continuous flow can be maintained. Provide belt scales for conveyor systems and calibrate accordingly. When more than one cold bin feeder is used, operate each as a separate unit. Integrate the individual controls with a master control fo r all materials.

503.03.3 Moisture: Make provisions for introducing the latest

moisture content of the cold feed aggregates into the belt weighing system, thereby correcting the conversion of wet aggregate weight to dry aggregate weight. Digitally display dry wei ght of the aggregate flow in appropriate units.

503.03.4 Screens: Provide a static screen system on top of the fine

sand cold feed bin system and the RAP bin system, to ensure removal of objectionable material. When a belt scale is used, provide a vibrating scal ping screen between the cold bin system discharge and the belt scale. Size the screens to remove all oversize aggregate and other objectionable material.

503.03.5 Reclaimed Asphalt Pavement (RAP): If RAP is used,

provide a separate cold feed system. Include a scalping screen, bin, feeder belt, and weigh bridge which is fully integrated with the cold feed system and asphalt cement supply system. Calibrate this system in accordance with 503.02.2 and 503.03.2 . Add RAP to the dryer in a location as recommended by the manufacturer so that it does not expose the material to direct flame.

503.04 Asphalt Cement.

503.04.1 Working Tank: Provide an asphalt cement working tank

capable of uniformly heating the material, under positive control, to the required temperature as recommended by the supplier by methods approved by the District Laboratory Engineer. Provide an asphalt circulating system of adequate size to e nsure proper and continuous circulation (except while asphalt is being measured). Equip new tanks with paddle -type mixers or agitators which keep the material in motion and minimize prolonged exposure to the heating source. Maintain the proper mixing temp erature of the asphalt. Heat and insulate pipelines and fittings. Provide a sampling spigot in each tank and/or the supply line. Place strainers or screens between the working tank and mixing unit to filter Provide an automatic plant no flow alarm and shutoff to cease operations when any aggregate bin becomes empty or flow is interrupted for 20 seconds. If repeated no flow indications are evident, cease operations until continuous flow can be maintained. Provide belt scales for conveyor systems and calibrate accordingly. When more than one cold bin feeder is used, operate each as a separate unit. Integrate the individual controls with a master control fo r all materials.

503.03.3 Moisture: Make provisions for introducing the latest

moisture content of the cold feed aggregates into the belt weighing system, thereby correcting the conversion of wet aggregate weight to dry aggregate weight. Digitally display dry wei ght of the aggregate flow in appropriate units.

503.03.4 Screens: Provide a static screen system on top of the fine

sand cold feed bin system and the RAP bin system, to ensure removal of objectionable material. When a belt scale is used, provide a vibrating scal ping screen between the cold bin system discharge and the belt scale. Size the screens to remove all oversize aggregate and other objectionable material.

503.03.5 Reclaimed Asphalt Pavement (RAP): If RAP is used,

provide a separate cold feed system. Include a scalping screen, bin, feeder belt, and weigh bridge which is fully integrated with the cold feed system and asphalt cement supply system. Calibrate this system in accordance with 503.02.2 and 503.03.2 . Add RAP to the dryer in a location as recommended by the manufacturer so that it does not expose the material to direct flame.

503.04 Asphalt Cement.

503.04.1 Working Tank: Provide an asphalt cement working tank

capable of uniformly heating the material, under positive control, to the required temperature as recommended by the supplier by methods approved by the District Laboratory Engineer. Provide an asphalt circulating system of adequate size to e nsure proper and continuous circulation (except while asphalt is being measured). Equip new tanks with paddle -type mixers or agitators which keep the material in motion and minimize prolonged exposure to the heating source. Maintain the proper mixing temp erature of the asphalt. Heat and insulate pipelines and fittings. Provide a sampling spigot in each tank and/or the supply line. Place strainers or screens between the working tank and mixing unit to filter Provide an automatic plant no flow alarm and shutoff to cease operations when any aggregate bin becomes empty or flow is interrupted for 20 seconds. If repeated no flow indications are evident, cease operations until continuous flow can be maintained. Provide belt scales for conveyor systems and calibrate accordingly. When more than one cold bin feeder is used, operate each as a separate unit. Integrate the individual controls with a master control fo r all materials.

503.03.3 Moisture: Make provisions for introducing the latest

moisture content of the cold feed aggregates into the belt weighing system, thereby correcting the conversion of wet aggregate weight to dry aggregate weight. Digitally display dry wei ght of the aggregate flow in appropriate units.

503.03.4 Screens: Provide a static screen system on top of the fine

sand cold feed bin system and the RAP bin system, to ensure removal of objectionable material. When a belt scale is used, provide a vibrating scal ping screen between the cold bin system discharge and the belt scale. Size the screens to remove all oversize aggregate and other objectionable material.

503.03.5 Reclaimed Asphalt Pavement (RAP): If RAP is used,

provide a separate cold feed system. Include a scalping screen, bin, feeder belt, and weigh bridge which is fully integrated with the cold feed system and asphalt cement supply system. Calibrate this system in accordance with 503.02.2 and 503.03.2 . Add RAP to the dryer in a location as recommended by the manufacturer so that it does not expose the material to direct flame.

503.04 Asphalt Cement.

503.04.1 Working Tank: Provide an asphalt cement working tank

capable of uniformly heating the material, under positive control, to the required temperature as recommended by the supplier by methods approved by the District Laboratory Engineer. Provide an asphalt circulating system of adequate size to e nsure proper and continuous circulation (except while asphalt is being measured). Equip new tanks with paddle -type mixers or agitators which keep the material in motion and minimize prolonged exposure to the heating source. Maintain the proper mixing temp erature of the asphalt. Heat and insulate pipelines and fittings. Provide a sampling spigot in each tank and/or the supply line. Place strainers or screens between the working tank and mixing unit to filter Provide an automatic plant no flow alarm and shutoff to cease operations when any aggregate bin becomes empty or flow is interrupted for 20 seconds. If repeated no flow indications are evident, cease operations until continuous flow can be maintained. Provide belt scales for conveyor systems and calibrate accordingly. When more than one cold bin feeder is used, operate each as a separate unit. Integrate the individual controls with a master control fo r all materials.

503.03.3 Moisture: Make provisions for introducing the latest

moisture content of the cold feed aggregates into the belt weighing system, thereby correcting the conversion of wet aggregate weight to dry aggregate weight. Digitally display dry wei ght of the aggregate flow in appropriate units.

503.03.4 Screens: Provide a static screen system on top of the fine

sand cold feed bin system and the RAP bin system, to ensure removal of objectionable material. When a belt scale is used, provide a vibrating scal ping screen between the cold bin system discharge and the belt scale. Size the screens to remove all oversize aggregate and other objectionable material.

503.03.5 Reclaimed Asphalt Pavement (RAP): If RAP is used,

provide a separate cold feed system. Include a scalping screen, bin, feeder belt, and weigh bridge which is fully integrated with the cold feed system and asphalt cement supply system. Calibrate this system in accordance with 503.02.2 and 503.03.2 . Add RAP to the dryer in a location as recommended by the manufacturer so that it does not expose the material to direct flame.

503.04 Asphalt Cement.

503.04.1 Working Tank: Provide an asphalt cement working tank

capable of uniformly heating the material, under positive control, to the required temperature as recommended by the supplier by methods approved by the District Laboratory Engineer. Provide an asphalt circulating system of adequate size to e nsure proper and continuous circulation (except while asphalt is being measured). Equip new tanks with paddle -type mixers or agitators which keep the material in motion and minimize prolonged exposure to the heating source. Maintain the proper mixing temp erature of the asphalt. Heat and insulate pipelines and fittings. Provide a sampling spigot in each tank and/or the supply line. Place strainers or screens between the working tank and mixing unit to filter Provide an automatic plant no flow alarm and shutoff to cease operations when any aggregate bin becomes empty or flow is interrupted for 20 seconds. If repeated no flow indications are evident, cease operations until continuous flow can be maintained. Provide belt scales for conveyor systems and calibrate accordingly. When more than one cold bin feeder is used, operate each as a separate unit. Integrate the individual controls with a master control fo r all materials.

503.03.3 Moisture: Make provisions for introducing the latest

moisture content of the cold feed aggregates into the belt weighing system, thereby correcting the conversion of wet aggregate weight to dry aggregate weight. Digitally display dry wei ght of the aggregate flow in appropriate units.

503.03.4 Screens: Provide a static screen system on top of the fine

sand cold feed bin system and the RAP bin system, to ensure removal of objectionable material. When a belt scale is used, provide a vibrating scal ping screen between the cold bin system discharge and the belt scale. Size the screens to remove all oversize aggregate and other objectionable material.

503.03.5 Reclaimed Asphalt Pavement (RAP): If RAP is used,

provide a separate cold feed system. Include a scalping screen, bin, feeder belt, and weigh bridge which is fully integrated with the cold feed system and asphalt cement supply system. Calibrate this system in accordance with 503.02.2 and 503.03.2 . Add RAP to the dryer in a location as recommended by the manufacturer so that it does not expose the material to direct flame.

503.04 Asphalt Cement.

503.04.1 Working Tank: Provide an asphalt cement working tank

capable of uniformly heating the material, under positive control, to the required temperature as recommended by the supplier by methods approved by the District Laboratory Engineer. Provide an asphalt circulating system of adequate size to e nsure proper and continuous circulation (except while asphalt is being measured). Equip new tanks with paddle -type mixers or agitators which keep the material in motion and minimize prolonged exposure to the heating source. Maintain the proper mixing temp erature of the asphalt. Heat and insulate pipelines and fittings. Provide a sampling spigot in each tank and/or the supply line. Place strainers or screens between the working tank and mixing unit to filter Provide an automatic plant no flow alarm and shutoff to cease operations when any aggregate bin becomes empty or flow is interrupted for 20 seconds. If repeated no flow indications are evident, cease operations until continuous flow can be maintained. Provide belt scales for conveyor systems and calibrate accordingly. When more than one cold bin feeder is used, operate each as a separate unit. Integrate the individual controls with a master control fo r all materials.

503.03.3 Moisture: Make provisions for introducing the latest

moisture content of the cold feed aggregates into the belt weighing system, thereby correcting the conversion of wet aggregate weight to dry aggregate weight. Digitally display dry wei ght of the aggregate flow in appropriate units.

503.03.4 Screens: Provide a static screen system on top of the fine

sand cold feed bin system and the RAP bin system, to ensure removal of objectionable material. When a belt scale is used, provide a vibrating scal ping screen between the cold bin system discharge and the belt scale. Size the screens to remove all oversize aggregate and other objectionable material.

503.03.5 Reclaimed Asphalt Pavement (RAP): If RAP is used,

provide a separate cold feed system. Include a scalping screen, bin, feeder belt, and weigh bridge which is fully integrated with the cold feed system and asphalt cement supply system. Calibrate this system in accordance with 503.02.2 and 503.03.2 . Add RAP to the dryer in a location as recommended by the manufacturer so that it does not expose the material to direct flame.

503.04 Asphalt Cement.

503.04.1 Working Tank: Provide an asphalt cement working tank

capable of uniformly heating the material, under positive control, to the required temperature as recommended by the supplier by methods approved by the District Laboratory Engineer. Provide an asphalt circulating system of adequate size to e nsure proper and continuous circulation (except while asphalt is being measured). Equip new tanks with paddle -type mixers or agitators which keep the material in motion and minimize prolonged exposure to the heating source. Maintain the proper mixing temp erature of the asphalt. Heat and insulate pipelines and fittings. Provide a sampling spigot in each tank and/or the supply line. Place strainers or screens between the working tank and mixing unit to filter undesirable material. Fix a thermometer gradua ted in 5°F increments and having an accuracy of ±5°F in the asphalt feed line at an approved location near the discharge valve at the mixer unit to indicate the temperature of asphalt from storage.

503.04.2 Measurement: Measure the asphalt cement either by

weight or volume. Ensure that all scales and meters are calibrated and accurate to 0.5 percent. Display by percent the rate of flow of asphalt cement and the total quantity used .

503.04.2 1 Weight Measurement: Provide scales reading to the

nearest pound.

503.04.2 2 Volum e Measurement: Measure the asphalt cement

by volume using a positive displacement pump and record in digital form to the nearest gallon. Periodically check by weight the quantity of asphalt cement delivered. Continuously display in digital form the cor rected rate of asphalt cement delivery and the total quantity delivered. Ensure measurement during production is accurate to within 1.0 percent.

503.05 ADDITIVES. When additives are used, digitally display the rate

of flow and the total quantity used for eac h. Provide meters accurate to 0.5 percent.

503.05.1 Anti-Strip: Provide a recirculation anti -strip additive

storage tank producing uniform heat with an indicating thermometer at an approved location near the tank discharge point. Place a thermometer graduated in 5°F increments and having an accuracy of ±5°F at an approved point near the anti -stripping tank discharge point before the meter. Disperse anti -strip additive directly into the asphalt feed line at a location between the asphalt control valve and the end of the asphalt discharge line. Ensure that the anti -strip delivery system continuously delivers the proper amount of material and in correct proportion to the asphalt cement. This system must be equipped with a no -flow indicator, which triggers a lig ht or alarm in the control room and an alarm in the plant lab when the anti -strip material is not flowing. If the anti -strip flow is stopped or interrupted for more than 5 minutes, discontinue production until the system is repaired. The equipment shall include a positive displacement accumulating meter which accumulates and displays materials used, and reads to the nearest 0.25 gallon. Additionally, provide a measuring dip stick and a chart correlating tank quantity with the height of anti-strip liquid. undesirable material. Fix a thermometer gradua ted in 5°F increments and having an accuracy of ±5°F in the asphalt feed line at an approved location near the discharge valve at the mixer unit to indicate the temperature of asphalt from storage.

503.04.2 Measurement: Measure the asphalt cement either by

weight or volume. Ensure that all scales and meters are calibrated and accurate to 0.5 percent. Display by percent the rate of flow of asphalt cement and the total quantity used .

503.04.2 1 Weight Measurement: Provide scales reading to the

nearest pound.

503.04.2 2 Volum e Measurement: Measure the asphalt cement

by volume using a positive displacement pump and record in digital form to the nearest gallon. Periodically check by weight the quantity of asphalt cement delivered. Continuously display in digital form the cor rected rate of asphalt cement delivery and the total quantity delivered. Ensure measurement during production is accurate to within 1.0 percent.

503.05 ADDITIVES. When additives are used, digitally display the rate

of flow and the total quantity used for eac h. Provide meters accurate to 0.5 percent.

503.05.1 Anti-Strip: Provide a recirculation anti -strip additive

storage tank producing uniform heat with an indicating thermometer at an approved location near the tank discharge point. Place a thermometer graduated in 5°F increments and having an accuracy of ±5°F at an approved point near the anti -stripping tank discharge point before the meter. Disperse anti -strip additive directly into the asphalt feed line at a location between the asphalt control valve and the end of the asphalt discharge line. Ensure that the anti -strip delivery system continuously delivers the proper amount of material and in correct proportion to the asphalt cement. This system must be equipped with a no -flow indicator, which triggers a lig ht or alarm in the control room and an alarm in the plant lab when the anti -strip material is not flowing. If the anti -strip flow is stopped or interrupted for more than 5 minutes, discontinue production until the system is repaired. The equipment shall include a positive displacement accumulating meter which accumulates and displays materials used, and reads to the nearest 0.25 gallon. Additionally, provide a measuring dip stick and a chart correlating tank quantity with the height of anti-strip liquid. undesirable material. Fix a thermometer gradua ted in 5°F increments and having an accuracy of ±5°F in the asphalt feed line at an approved location near the discharge valve at the mixer unit to indicate the temperature of asphalt from storage.

503.04.2 Measurement: Measure the asphalt cement either by

weight or volume. Ensure that all scales and meters are calibrated and accurate to 0.5 percent. Display by percent the rate of flow of asphalt cement and the total quantity used .

503.04.2 1 Weight Measurement: Provide scales reading to the

nearest pound.

503.04.2 2 Volum e Measurement: Measure the asphalt cement

by volume using a positive displacement pump and record in digital form to the nearest gallon. Periodically check by weight the quantity of asphalt cement delivered. Continuously display in digital form the cor rected rate of asphalt cement delivery and the total quantity delivered. Ensure measurement during production is accurate to within 1.0 percent.

503.05 ADDITIVES. When additives are used, digitally display the rate

of flow and the total quantity used for eac h. Provide meters accurate to 0.5 percent.

503.05.1 Anti-Strip: Provide a recirculation anti -strip additive

storage tank producing uniform heat with an indicating thermometer at an approved location near the tank discharge point. Place a thermometer graduated in 5°F increments and having an accuracy of ±5°F at an approved point near the anti -stripping tank discharge point before the meter. Disperse anti -strip additive directly into the asphalt feed line at a location between the asphalt control valve and the end of the asphalt discharge line. Ensure that the anti -strip delivery system continuously delivers the proper amount of material and in correct proportion to the asphalt cement. This system must be equipped with a no -flow indicator, which triggers a lig ht or alarm in the control room and an alarm in the plant lab when the anti -strip material is not flowing. If the anti -strip flow is stopped or interrupted for more than 5 minutes, discontinue production until the system is repaired. The equipment shall include a positive displacement accumulating meter which accumulates and displays materials used, and reads to the nearest 0.25 gallon. Additionally, provide a measuring dip stick and a chart correlating tank quantity with the height of anti-strip liquid. undesirable material. Fix a thermometer gradua ted in 5°F increments and having an accuracy of ±5°F in the asphalt feed line at an approved location near the discharge valve at the mixer unit to indicate the temperature of asphalt from storage.

503.04.2 Measurement: Measure the asphalt cement either by

weight or volume. Ensure that all scales and meters are calibrated and accurate to 0.5 percent. Display by percent the rate of flow of asphalt cement and the total quantity used .

503.04.2 1 Weight Measurement: Provide scales reading to the

nearest pound.

503.04.2 2 Volum e Measurement: Measure the asphalt cement

by volume using a positive displacement pump and record in digital form to the nearest gallon. Periodically check by weight the quantity of asphalt cement delivered. Continuously display in digital form the cor rected rate of asphalt cement delivery and the total quantity delivered. Ensure measurement during production is accurate to within 1.0 percent.

503.05 ADDITIVES. When additives are used, digitally display the rate

of flow and the total quantity used for eac h. Provide meters accurate to 0.5 percent.

503.05.1 Anti-Strip: Provide a recirculation anti -strip additive

storage tank producing uniform heat with an indicating thermometer at an approved location near the tank discharge point. Place a thermometer graduated in 5°F increments and having an accuracy of ±5°F at an approved point near the anti -stripping tank discharge point before the meter. Disperse anti -strip additive directly into the asphalt feed line at a location between the asphalt control valve and the end of the asphalt discharge line. Ensure that the anti -strip delivery system continuously delivers the proper amount of material and in correct proportion to the asphalt cement. This system must be equipped with a no -flow indicator, which triggers a lig ht or alarm in the control room and an alarm in the plant lab when the anti -strip material is not flowing. If the anti -strip flow is stopped or interrupted for more than 5 minutes, discontinue production until the system is repaired. The equipment shall include a positive displacement accumulating meter which accumulates and displays materials used, and reads to the nearest 0.25 gallon. Additionally, provide a measuring dip stick and a chart correlating tank quantity with the height of anti-strip liquid. undesirable material. Fix a thermometer gradua ted in 5°F increments and having an accuracy of ±5°F in the asphalt feed line at an approved location near the discharge valve at the mixer unit to indicate the temperature of asphalt from storage.

503.04.2 Measurement: Measure the asphalt cement either by

weight or volume. Ensure that all scales and meters are calibrated and accurate to 0.5 percent. Display by percent the rate of flow of asphalt cement and the total quantity used .

503.04.2 1 Weight Measurement: Provide scales reading to the

nearest pound.

503.04.2 2 Volum e Measurement: Measure the asphalt cement

by volume using a positive displacement pump and record in digital form to the nearest gallon. Periodically check by weight the quantity of asphalt cement delivered. Continuously display in digital form the cor rected rate of asphalt cement delivery and the total quantity delivered. Ensure measurement during production is accurate to within 1.0 percent.

503.05 ADDITIVES. When additives are used, digitally display the rate

of flow and the total quantity used for eac h. Provide meters accurate to 0.5 percent.

503.05.1 Anti-Strip: Provide a recirculation anti -strip additive

storage tank producing uniform heat with an indicating thermometer at an approved location near the tank discharge point. Place a thermometer graduated in 5°F increments and having an accuracy of ±5°F at an approved point near the anti -stripping tank discharge point before the meter. Disperse anti -strip additive directly into the asphalt feed line at a location between the asphalt control valve and the end of the asphalt discharge line. Ensure that the anti -strip delivery system continuously delivers the proper amount of material and in correct proportion to the asphalt cement. This system must be equipped with a no -flow indicator, which triggers a lig ht or alarm in the control room and an alarm in the plant lab when the anti -strip material is not flowing. If the anti -strip flow is stopped or interrupted for more than 5 minutes, discontinue production until the system is repaired. The equipment shall include a positive displacement accumulating meter which accumulates and displays materials used, and reads to the nearest 0.25 gallon. Additionally, provide a measuring dip stick and a chart correlating tank quantity with the height of anti-strip liquid. undesirable material. Fix a thermometer gradua ted in 5°F increments and having an accuracy of ±5°F in the asphalt feed line at an approved location near the discharge valve at the mixer unit to indicate the temperature of asphalt from storage.

503.04.2 Measurement: Measure the asphalt cement either by

weight or volume. Ensure that all scales and meters are calibrated and accurate to 0.5 percent. Display by percent the rate of flow of asphalt cement and the total quantity used .

503.04.2 1 Weight Measurement: Provide scales reading to the

nearest pound.

503.04.2 2 Volum e Measurement: Measure the asphalt cement

by volume using a positive displacement pump and record in digital form to the nearest gallon. Periodically check by weight the quantity of asphalt cement delivered. Continuously display in digital form the cor rected rate of asphalt cement delivery and the total quantity delivered. Ensure measurement during production is accurate to within 1.0 percent.

503.05 ADDITIVES. When additives are used, digitally display the rate

of flow and the total quantity used for eac h. Provide meters accurate to 0.5 percent.

503.05.1 Anti-Strip: Provide a recirculation anti -strip additive

storage tank producing uniform heat with an indicating thermometer at an approved location near the tank discharge point. Place a thermometer graduated in 5°F increments and having an accuracy of ±5°F at an approved point near the anti -stripping tank discharge point before the meter. Disperse anti -strip additive directly into the asphalt feed line at a location between the asphalt control valve and the end of the asphalt discharge line. Ensure that the anti -strip delivery system continuously delivers the proper amount of material and in correct proportion to the asphalt cement. This system must be equipped with a no -flow indicator, which triggers a lig ht or alarm in the control room and an alarm in the plant lab when the anti -strip material is not flowing. If the anti -strip flow is stopped or interrupted for more than 5 minutes, discontinue production until the system is repaired. The equipment shall include a positive displacement accumulating meter which accumulates and displays materials used, and reads to the nearest 0.25 gallon. Additionally, provide a measuring dip stick and a chart correlating tank quantity with the height of anti-strip liquid.

503.05.2 Plant Blending: Equipment required to introduce crumb

rubber modifier, latex, or warm mix additives is described herein. Submit a proposed plant equipment diagram to the District Laboratory Engineer for review and forward a copy to the Materials Engin eer. Provide written confirmation from the equipment manufacturer that the quantity and type of mixers are appropriate for the proposed materials and flow rates. When modifying asphalt liquid binder at the contractor’s plant to meet a new grade of asphal t, provide a Dynamic Shear Rheometer (DSR) for on -site quality control testing. The District Laboratory Engineer will inspect the plant facilities.

503.05.2 1 In-Line Blending: Provide a sampling spigot in line

after the point of mixing and prior to anti -stripping introduction. When modifying the binder with additives, use a totalizing meter to measure the quantity of additive in a similar manner as anti -strip.

503.05.2 2 Single Tank Batch Blending: A single tank system

consists of a single blending tank used to blend cru mb rubber modifiers. Provide a 20,000 -gallon capacity tank or greater, which serves as both a mixing liquid tank and working liquid tank. Continuously mix the liquid and crumb rubber or other additive with paddle type mixers, auger type mixers, or shear mills to properly blend and maintain suspension. Provide a safe and easily accessible sampling spigot.

503.05.2 3 Multiple Tank System: A multiple tank system

consists of a blending tank feeding into a working tank used to blend crumb rubber modifiers. The blend ing tank may be batch or continuous with metered feed controls to accurately maintain proper ratios of crumb rubber or other additive to neat asphalt binder liquid. Properly agitate the mixture in the working tank with paddle type mixers or auger type mix ers to maintain suspension of the modified liquid. Provide a safe and easily accessible sampling spigot.

503.05.3 Warm Mix Additives: Provide necessary equipment in

accordance with the manufacturer’s recommendations and submit a proposed plant equipment diagram to the District Laboratory Engineer for review. Forward a copy to the Materials Engineer.

503.05.3 1 Foaming Using Water Injection: Provide an

approved foamed asphalt injection system flow diagram upon request. Provide a control room indicator when using the water injection system.

503.05.3 2 Chemical Additives: Chemical additives are

supplied by the liquid supplier, by mixing in the working tank, by in -line

503.05.2 Plant Blending: Equipment required to introduce crumb

rubber modifier, latex, or warm mix additives is described herein. Submit a proposed plant equipment diagram to the District Laboratory Engineer for review and forward a copy to the Materials Engin eer. Provide written confirmation from the equipment manufacturer that the quantity and type of mixers are appropriate for the proposed materials and flow rates. When modifying asphalt liquid binder at the contractor’s plant to meet a new grade of asphal t, provide a Dynamic Shear Rheometer (DSR) for on -site quality control testing. The District Laboratory Engineer will inspect the plant facilities.

503.05.2 1 In-Line Blending: Provide a sampling spigot in line

after the point of mixing and prior to anti -stripping introduction. When modifying the binder with additives, use a totalizing meter to measure the quantity of additive in a similar manner as anti -strip.

503.05.2 2 Single Tank Batch Blending: A single tank system

consists of a single blending tank used to blend cru mb rubber modifiers. Provide a 20,000 -gallon capacity tank or greater, which serves as both a mixing liquid tank and working liquid tank. Continuously mix the liquid and crumb rubber or other additive with paddle type mixers, auger type mixers, or shear mills to properly blend and maintain suspension. Provide a safe and easily accessible sampling spigot.

503.05.2 3 Multiple Tank System: A multiple tank system

consists of a blending tank feeding into a working tank used to blend crumb rubber modifiers. The blend ing tank may be batch or continuous with metered feed controls to accurately maintain proper ratios of crumb rubber or other additive to neat asphalt binder liquid. Properly agitate the mixture in the working tank with paddle type mixers or auger type mix ers to maintain suspension of the modified liquid. Provide a safe and easily accessible sampling spigot.

503.05.3 Warm Mix Additives: Provide necessary equipment in

accordance with the manufacturer’s recommendations and submit a proposed plant equipment diagram to the District Laboratory Engineer for review. Forward a copy to the Materials Engineer.

503.05.3 1 Foaming Using Water Injection: Provide an

approved foamed asphalt injection system flow diagram upon request. Provide a control room indicator when using the water injection system.

503.05.3 2 Chemical Additives: Chemical additives are

supplied by the liquid supplier, by mixing in the working tank, by in -line

503.05.2 Plant Blending: Equipment required to introduce crumb

rubber modifier, latex, or warm mix additives is described herein. Submit a proposed plant equipment diagram to the District Laboratory Engineer for review and forward a copy to the Materials Engin eer. Provide written confirmation from the equipment manufacturer that the quantity and type of mixers are appropriate for the proposed materials and flow rates. When modifying asphalt liquid binder at the contractor’s plant to meet a new grade of asphal t, provide a Dynamic Shear Rheometer (DSR) for on -site quality control testing. The District Laboratory Engineer will inspect the plant facilities.

503.05.2 1 In-Line Blending: Provide a sampling spigot in line

after the point of mixing and prior to anti -stripping introduction. When modifying the binder with additives, use a totalizing meter to measure the quantity of additive in a similar manner as anti -strip.

503.05.2 2 Single Tank Batch Blending: A single tank system

consists of a single blending tank used to blend cru mb rubber modifiers. Provide a 20,000 -gallon capacity tank or greater, which serves as both a mixing liquid tank and working liquid tank. Continuously mix the liquid and crumb rubber or other additive with paddle type mixers, auger type mixers, or shear mills to properly blend and maintain suspension. Provide a safe and easily accessible sampling spigot.

503.05.2 3 Multiple Tank System: A multiple tank system

consists of a blending tank feeding into a working tank used to blend crumb rubber modifiers. The blend ing tank may be batch or continuous with metered feed controls to accurately maintain proper ratios of crumb rubber or other additive to neat asphalt binder liquid. Properly agitate the mixture in the working tank with paddle type mixers or auger type mix ers to maintain suspension of the modified liquid. Provide a safe and easily accessible sampling spigot.

503.05.3 Warm Mix Additives: Provide necessary equipment in

accordance with the manufacturer’s recommendations and submit a proposed plant equipment diagram to the District Laboratory Engineer for review. Forward a copy to the Materials Engineer.

503.05.3 1 Foaming Using Water Injection: Provide an

approved foamed asphalt injection system flow diagram upon request. Provide a control room indicator when using the water injection system.

503.05.3 2 Chemical Additives: Chemical additives are

supplied by the liquid supplier, by mixing in the working tank, by in -line

503.05.2 Plant Blending: Equipment required to introduce crumb

rubber modifier, latex, or warm mix additives is described herein. Submit a proposed plant equipment diagram to the District Laboratory Engineer for review and forward a copy to the Materials Engin eer. Provide written confirmation from the equipment manufacturer that the quantity and type of mixers are appropriate for the proposed materials and flow rates. When modifying asphalt liquid binder at the contractor’s plant to meet a new grade of asphal t, provide a Dynamic Shear Rheometer (DSR) for on -site quality control testing. The District Laboratory Engineer will inspect the plant facilities.

503.05.2 1 In-Line Blending: Provide a sampling spigot in line

after the point of mixing and prior to anti -stripping introduction. When modifying the binder with additives, use a totalizing meter to measure the quantity of additive in a similar manner as anti -strip.

503.05.2 2 Single Tank Batch Blending: A single tank system

consists of a single blending tank used to blend cru mb rubber modifiers. Provide a 20,000 -gallon capacity tank or greater, which serves as both a mixing liquid tank and working liquid tank. Continuously mix the liquid and crumb rubber or other additive with paddle type mixers, auger type mixers, or shear mills to properly blend and maintain suspension. Provide a safe and easily accessible sampling spigot.

503.05.2 3 Multiple Tank System: A multiple tank system

consists of a blending tank feeding into a working tank used to blend crumb rubber modifiers. The blend ing tank may be batch or continuous with metered feed controls to accurately maintain proper ratios of crumb rubber or other additive to neat asphalt binder liquid. Properly agitate the mixture in the working tank with paddle type mixers or auger type mix ers to maintain suspension of the modified liquid. Provide a safe and easily accessible sampling spigot.

503.05.3 Warm Mix Additives: Provide necessary equipment in

accordance with the manufacturer’s recommendations and submit a proposed plant equipment diagram to the District Laboratory Engineer for review. Forward a copy to the Materials Engineer.

503.05.3 1 Foaming Using Water Injection: Provide an

approved foamed asphalt injection system flow diagram upon request. Provide a control room indicator when using the water injection system.

503.05.3 2 Chemical Additives: Chemical additives are

supplied by the liquid supplier, by mixing in the working tank, by in -line

503.05.2 Plant Blending: Equipment required to introduce crumb

rubber modifier, latex, or warm mix additives is described herein. Submit a proposed plant equipment diagram to the District Laboratory Engineer for review and forward a copy to the Materials Engin eer. Provide written confirmation from the equipment manufacturer that the quantity and type of mixers are appropriate for the proposed materials and flow rates. When modifying asphalt liquid binder at the contractor’s plant to meet a new grade of asphal t, provide a Dynamic Shear Rheometer (DSR) for on -site quality control testing. The District Laboratory Engineer will inspect the plant facilities.

503.05.2 1 In-Line Blending: Provide a sampling spigot in line

after the point of mixing and prior to anti -stripping introduction. When modifying the binder with additives, use a totalizing meter to measure the quantity of additive in a similar manner as anti -strip.

503.05.2 2 Single Tank Batch Blending: A single tank system

consists of a single blending tank used to blend cru mb rubber modifiers. Provide a 20,000 -gallon capacity tank or greater, which serves as both a mixing liquid tank and working liquid tank. Continuously mix the liquid and crumb rubber or other additive with paddle type mixers, auger type mixers, or shear mills to properly blend and maintain suspension. Provide a safe and easily accessible sampling spigot.

503.05.2 3 Multiple Tank System: A multiple tank system

consists of a blending tank feeding into a working tank used to blend crumb rubber modifiers. The blend ing tank may be batch or continuous with metered feed controls to accurately maintain proper ratios of crumb rubber or other additive to neat asphalt binder liquid. Properly agitate the mixture in the working tank with paddle type mixers or auger type mix ers to maintain suspension of the modified liquid. Provide a safe and easily accessible sampling spigot.

503.05.3 Warm Mix Additives: Provide necessary equipment in

accordance with the manufacturer’s recommendations and submit a proposed plant equipment diagram to the District Laboratory Engineer for review. Forward a copy to the Materials Engineer.

503.05.3 1 Foaming Using Water Injection: Provide an

approved foamed asphalt injection system flow diagram upon request. Provide a control room indicator when using the water injection system.

503.05.3 2 Chemical Additives: Chemical additives are

supplied by the liquid supplier, by mixing in the working tank, by in -line

503.05.2 Plant Blending: Equipment required to introduce crumb

rubber modifier, latex, or warm mix additives is described herein. Submit a proposed plant equipment diagram to the District Laboratory Engineer for review and forward a copy to the Materials Engin eer. Provide written confirmation from the equipment manufacturer that the quantity and type of mixers are appropriate for the proposed materials and flow rates. When modifying asphalt liquid binder at the contractor’s plant to meet a new grade of asphal t, provide a Dynamic Shear Rheometer (DSR) for on -site quality control testing. The District Laboratory Engineer will inspect the plant facilities.

503.05.2 1 In-Line Blending: Provide a sampling spigot in line

after the point of mixing and prior to anti -stripping introduction. When modifying the binder with additives, use a totalizing meter to measure the quantity of additive in a similar manner as anti -strip.

503.05.2 2 Single Tank Batch Blending: A single tank system

consists of a single blending tank used to blend cru mb rubber modifiers. Provide a 20,000 -gallon capacity tank or greater, which serves as both a mixing liquid tank and working liquid tank. Continuously mix the liquid and crumb rubber or other additive with paddle type mixers, auger type mixers, or shear mills to properly blend and maintain suspension. Provide a safe and easily accessible sampling spigot.

503.05.2 3 Multiple Tank System: A multiple tank system

consists of a blending tank feeding into a working tank used to blend crumb rubber modifiers. The blend ing tank may be batch or continuous with metered feed controls to accurately maintain proper ratios of crumb rubber or other additive to neat asphalt binder liquid. Properly agitate the mixture in the working tank with paddle type mixers or auger type mix ers to maintain suspension of the modified liquid. Provide a safe and easily accessible sampling spigot.

503.05.3 Warm Mix Additives: Provide necessary equipment in

accordance with the manufacturer’s recommendations and submit a proposed plant equipment diagram to the District Laboratory Engineer for review. Forward a copy to the Materials Engineer.

503.05.3 1 Foaming Using Water Injection: Provide an

approved foamed asphalt injection system flow diagram upon request. Provide a control room indicator when using the water injection system.

503.05.3 2 Chemical Additives: Chemical additives are

supplied by the liquid supplier, by mixing in the working tank, by in -line

503.05.2 Plant Blending: Equipment required to introduce crumb

rubber modifier, latex, or warm mix additives is described herein. Submit a proposed plant equipment diagram to the District Laboratory Engineer for review and forward a copy to the Materials Engin eer. Provide written confirmation from the equipment manufacturer that the quantity and type of mixers are appropriate for the proposed materials and flow rates. When modifying asphalt liquid binder at the contractor’s plant to meet a new grade of asphal t, provide a Dynamic Shear Rheometer (DSR) for on -site quality control testing. The District Laboratory Engineer will inspect the plant facilities.

503.05.2 1 In-Line Blending: Provide a sampling spigot in line

after the point of mixing and prior to anti -stripping introduction. When modifying the binder with additives, use a totalizing meter to measure the quantity of additive in a similar manner as anti -strip.

503.05.2 2 Single Tank Batch Blending: A single tank system

consists of a single blending tank used to blend cru mb rubber modifiers. Provide a 20,000 -gallon capacity tank or greater, which serves as both a mixing liquid tank and working liquid tank. Continuously mix the liquid and crumb rubber or other additive with paddle type mixers, auger type mixers, or shear mills to properly blend and maintain suspension. Provide a safe and easily accessible sampling spigot.

503.05.2 3 Multiple Tank System: A multiple tank system

consists of a blending tank feeding into a working tank used to blend crumb rubber modifiers. The blend ing tank may be batch or continuous with metered feed controls to accurately maintain proper ratios of crumb rubber or other additive to neat asphalt binder liquid. Properly agitate the mixture in the working tank with paddle type mixers or auger type mix ers to maintain suspension of the modified liquid. Provide a safe and easily accessible sampling spigot.

503.05.3 Warm Mix Additives: Provide necessary equipment in

accordance with the manufacturer’s recommendations and submit a proposed plant equipment diagram to the District Laboratory Engineer for review. Forward a copy to the Materials Engineer.

503.05.3 1 Foaming Using Water Injection: Provide an

approved foamed asphalt injection system flow diagram upon request. Provide a control room indicator when using the water injection system.

503.05.3 2 Chemical Additives: Chemical additives are

supplied by the liquid supplier, by mixing in the working tank, by in -line

503.05.2 Plant Blending: Equipment required to introduce crumb

rubber modifier, latex, or warm mix additives is described herein. Submit a proposed plant equipment diagram to the District Laboratory Engineer for review and forward a copy to the Materials Engin eer. Provide written confirmation from the equipment manufacturer that the quantity and type of mixers are appropriate for the proposed materials and flow rates. When modifying asphalt liquid binder at the contractor’s plant to meet a new grade of asphal t, provide a Dynamic Shear Rheometer (DSR) for on -site quality control testing. The District Laboratory Engineer will inspect the plant facilities.

503.05.2 1 In-Line Blending: Provide a sampling spigot in line

after the point of mixing and prior to anti -stripping introduction. When modifying the binder with additives, use a totalizing meter to measure the quantity of additive in a similar manner as anti -strip.

503.05.2 2 Single Tank Batch Blending: A single tank system

consists of a single blending tank used to blend cru mb rubber modifiers. Provide a 20,000 -gallon capacity tank or greater, which serves as both a mixing liquid tank and working liquid tank. Continuously mix the liquid and crumb rubber or other additive with paddle type mixers, auger type mixers, or shear mills to properly blend and maintain suspension. Provide a safe and easily accessible sampling spigot.

503.05.2 3 Multiple Tank System: A multiple tank system

consists of a blending tank feeding into a working tank used to blend crumb rubber modifiers. The blend ing tank may be batch or continuous with metered feed controls to accurately maintain proper ratios of crumb rubber or other additive to neat asphalt binder liquid. Properly agitate the mixture in the working tank with paddle type mixers or auger type mix ers to maintain suspension of the modified liquid. Provide a safe and easily accessible sampling spigot.

503.05.3 Warm Mix Additives: Provide necessary equipment in

accordance with the manufacturer’s recommendations and submit a proposed plant equipment diagram to the District Laboratory Engineer for review. Forward a copy to the Materials Engineer.

503.05.3 1 Foaming Using Water Injection: Provide an

approved foamed asphalt injection system flow diagram upon request. Provide a control room indicator when using the water injection system.

503.05.3 2 Chemical Additives: Chemical additives are

supplied by the liquid supplier, by mixing in the working tank, by in -line blending, or by introducing as an anti -strip. Provide a system that continuously records the quantity of additive used.

503.05.4 Mineral Filler: Proportion mineral filler separately from a

bin equipped with an adjustable feed in accordance with Subsection

503.03.2 , which can be accurately and conveniently calibrated and be

interlocked with the aggregate. The feeder shall accurately proportion the mineral filler and provide a constant flow of material. For continuous drum mixer plants introduce the mineral filler, if used, to the mix at an approved location sufficiently in advance of the addition of the asphalt cement.

503.05.5 Hydrated Lime : When hydrated lime additive is mixed

with aggregate on the belt feed, interlock and synchronize the hydrated lime additive equipment with cold feed controls. Equip the system with an automatic no flow indicator that will automatically shut the plant down when a malfunction causes an improper supply of additive or water. Equip the hydrated lime additive system with the following:

503.05.6 Fibers: Use a separate feed system to accurately proportion

and uniformly distribute the required quantity of mineral fibers into the mixture. Interlock the proportioning device with the aggregate feed or weigh system to maintain the correct proportions for all rates o f production. Control the fiber proportion to within ±10 percent of the amount of fibers blending, or by introducing as an anti -strip. Provide a system that continuously records the quantity of additive used.

503.05.4 Mineral Filler: Proportion mineral filler separately from a

bin equipped with an adjustable feed in accordance with Subsection

503.03.2 , which can be accurately and conveniently calibrated and be

interlocked with the aggregate. The feeder shall accurately proportion the mineral filler and provide a constant flow of material. For continuous drum mixer plants introduce the mineral filler, if used, to the mix at an approved location sufficiently in advance of the addition of the asphalt cement.

503.05.5 Hydrated Lime : When hydrated lime additive is mixed

with aggregate on the belt feed, interlock and synchronize the hydrated lime additive equipment with cold feed controls. Equip the system with an automatic no flow indicator that will automatically shut the plant down when a malfunction causes an improper supply of additive or water. Equip the hydrated lime additive system with the following:

503.05.6 Fibers: Use a separate feed system to accurately proportion

and uniformly distribute the required quantity of mineral fibers into the mixture. Interlock the proportioning device with the aggregate feed or weigh system to maintain the correct proportions for all rates o f production. Control the fiber proportion to within ±10 percent of the amount of fibers blending, or by introducing as an anti -strip. Provide a system that continuously records the quantity of additive used.

503.05.4 Mineral Filler: Proportion mineral filler separately from a

bin equipped with an adjustable feed in accordance with Subsection

503.03.2 , which can be accurately and conveniently calibrated and be

interlocked with the aggregate. The feeder shall accurately proportion the mineral filler and provide a constant flow of material. For continuous drum mixer plants introduce the mineral filler, if used, to the mix at an approved location sufficiently in advance of the addition of the asphalt cement.

503.05.5 Hydrated Lime : When hydrated lime additive is mixed

with aggregate on the belt feed, interlock and synchronize the hydrated lime additive equipment with cold feed controls. Equip the system with an automatic no flow indicator that will automatically shut the plant down when a malfunction causes an improper supply of additive or water. Equip the hydrated lime additive system with the following:

503.05.6 Fibers: Use a separate feed system to accurately proportion

and uniformly distribute the required quantity of mineral fibers into the mixture. Interlock the proportioning device with the aggregate feed or weigh system to maintain the correct proportions for all rates o f production. Control the fiber proportion to within ±10 percent of the amount of fibers blending, or by introducing as an anti -strip. Provide a system that continuously records the quantity of additive used.

503.05.4 Mineral Filler: Proportion mineral filler separately from a

bin equipped with an adjustable feed in accordance with Subsection

503.03.2 , which can be accurately and conveniently calibrated and be

interlocked with the aggregate. The feeder shall accurately proportion the mineral filler and provide a constant flow of material. For continuous drum mixer plants introduce the mineral filler, if used, to the mix at an approved location sufficiently in advance of the addition of the asphalt cement.

503.05.5 Hydrated Lime : When hydrated lime additive is mixed

with aggregate on the belt feed, interlock and synchronize the hydrated lime additive equipment with cold feed controls. Equip the system with an automatic no flow indicator that will automatically shut the plant down when a malfunction causes an improper supply of additive or water. Equip the hydrated lime additive system with the following:

503.05.6 Fibers: Use a separate feed system to accurately proportion

and uniformly distribute the required quantity of mineral fibers into the mixture. Interlock the proportioning device with the aggregate feed or weigh system to maintain the correct proportions for all rates o f production. Control the fiber proportion to within ±10 percent of the amount of fibers required. Equip the system with an automatic no flow indicator that will automatically shut the plant down when a malfunction causes an improper supply of fiber. For drum plants, add the fiber adjacent to the asphalt cement discharge location.

503.06 DRUM. Equip the drum with automatic burner controls that

continuously agitate aggregates during heating and drying. Provide equipment capable of heating and drying aggrega tes to meet specifications in the necessary quantities to supply the mixing unit continuously at its operating capacity and at a specified temperature and acceptable moisture content. Slope the drum and maintain flights in accordance with manufacturer’s r ecommendations. Produce a uniform blend at the specified production rate, with rapid and complete asphalt coating of aggregate. As a minimum, completely coat 95 percent of the coarse aggregate particles retained on the No. 4 sieve when tested in accordanc e with DOTD TR 328. Process the mixture at the temperature specified on the approved JMF and within ±25°F of the optimum mixing temperature at the discharge. Equip the drum with a thermometer or other temperature device to monitor the discharge temperatur e of the mix. Use temperature recording device or thermometers graduated in maximum 10°F increments with an accuracy of ±5°F and a sensitivity capable of detecting a change of at least 10°F per minute .

503.07 DUST COLLECTION SYST EM. Return the fines from the d ust

collection system at a uniform and regulated rate near the asphalt cement discharge.

503.08 Storage and Loading of Asphalt Concrete

MIXTURES.

503.08.1 Mix Conveyors: Transport the mix directly from plant to

the storage silos or surge bin system by means of an enc losed continuous type conveyor system designed to prevent spillage and match the production rate of the plant. Deliver the mixture to the storage silo or surge bin within ±15°F of plant discharge temperature.

503.08.2 Storage Silos and Surge Bins: Use approved storage

silos or surge bins for storing asphalt concrete mixtures. required. Equip the system with an automatic no flow indicator that will automatically shut the plant down when a malfunction causes an improper supply of fiber. For drum plants, add the fiber adjacent to the asphalt cement discharge location.

503.06 DRUM. Equip the drum with automatic burner controls that

continuously agitate aggregates during heating and drying. Provide equipment capable of heating and drying aggrega tes to meet specifications in the necessary quantities to supply the mixing unit continuously at its operating capacity and at a specified temperature and acceptable moisture content. Slope the drum and maintain flights in accordance with manufacturer’s r ecommendations. Produce a uniform blend at the specified production rate, with rapid and complete asphalt coating of aggregate. As a minimum, completely coat 95 percent of the coarse aggregate particles retained on the No. 4 sieve when tested in accordanc e with DOTD TR 328. Process the mixture at the temperature specified on the approved JMF and within ±25°F of the optimum mixing temperature at the discharge. Equip the drum with a thermometer or other temperature device to monitor the discharge temperatur e of the mix. Use temperature recording device or thermometers graduated in maximum 10°F increments with an accuracy of ±5°F and a sensitivity capable of detecting a change of at least 10°F per minute .

503.07 DUST COLLECTION SYST EM. Return the fines from the d ust

collection system at a uniform and regulated rate near the asphalt cement discharge.

503.08 Storage and Loading of Asphalt Concrete

MIXTURES.

503.08.1 Mix Conveyors: Transport the mix directly from plant to

the storage silos or surge bin system by means of an enc losed continuous type conveyor system designed to prevent spillage and match the production rate of the plant. Deliver the mixture to the storage silo or surge bin within ±15°F of plant discharge temperature.

503.08.2 Storage Silos and Surge Bins: Use approved storage

silos or surge bins for storing asphalt concrete mixtures. required. Equip the system with an automatic no flow indicator that will automatically shut the plant down when a malfunction causes an improper supply of fiber. For drum plants, add the fiber adjacent to the asphalt cement discharge location.

503.06 DRUM. Equip the drum with automatic burner controls that

continuously agitate aggregates during heating and drying. Provide equipment capable of heating and drying aggrega tes to meet specifications in the necessary quantities to supply the mixing unit continuously at its operating capacity and at a specified temperature and acceptable moisture content. Slope the drum and maintain flights in accordance with manufacturer’s r ecommendations. Produce a uniform blend at the specified production rate, with rapid and complete asphalt coating of aggregate. As a minimum, completely coat 95 percent of the coarse aggregate particles retained on the No. 4 sieve when tested in accordanc e with DOTD TR 328. Process the mixture at the temperature specified on the approved JMF and within ±25°F of the optimum mixing temperature at the discharge. Equip the drum with a thermometer or other temperature device to monitor the discharge temperatur e of the mix. Use temperature recording device or thermometers graduated in maximum 10°F increments with an accuracy of ±5°F and a sensitivity capable of detecting a change of at least 10°F per minute .

503.07 DUST COLLECTION SYST EM. Return the fines from the d ust

collection system at a uniform and regulated rate near the asphalt cement discharge.

503.08 Storage and Loading of Asphalt Concrete

MIXTURES.

503.08.1 Mix Conveyors: Transport the mix directly from plant to

the storage silos or surge bin system by means of an enc losed continuous type conveyor system designed to prevent spillage and match the production rate of the plant. Deliver the mixture to the storage silo or surge bin within ±15°F of plant discharge temperature.

503.08.2 Storage Silos and Surge Bins: Use approved storage

silos or surge bins for storing asphalt concrete mixtures. required. Equip the system with an automatic no flow indicator that will automatically shut the plant down when a malfunction causes an improper supply of fiber. For drum plants, add the fiber adjacent to the asphalt cement discharge location.

503.06 DRUM. Equip the drum with automatic burner controls that

continuously agitate aggregates during heating and drying. Provide equipment capable of heating and drying aggrega tes to meet specifications in the necessary quantities to supply the mixing unit continuously at its operating capacity and at a specified temperature and acceptable moisture content. Slope the drum and maintain flights in accordance with manufacturer’s r ecommendations. Produce a uniform blend at the specified production rate, with rapid and complete asphalt coating of aggregate. As a minimum, completely coat 95 percent of the coarse aggregate particles retained on the No. 4 sieve when tested in accordanc e with DOTD TR 328. Process the mixture at the temperature specified on the approved JMF and within ±25°F of the optimum mixing temperature at the discharge. Equip the drum with a thermometer or other temperature device to monitor the discharge temperatur e of the mix. Use temperature recording device or thermometers graduated in maximum 10°F increments with an accuracy of ±5°F and a sensitivity capable of detecting a change of at least 10°F per minute .

503.07 DUST COLLECTION SYST EM. Return the fines from the d ust

collection system at a uniform and regulated rate near the asphalt cement discharge.

503.08 Storage and Loading of Asphalt Concrete

MIXTURES.

503.08.1 Mix Conveyors: Transport the mix directly from plant to

the storage silos or surge bin system by means of an enc losed continuous type conveyor system designed to prevent spillage and match the production rate of the plant. Deliver the mixture to the storage silo or surge bin within ±15°F of plant discharge temperature.

503.08.2 Storage Silos and Surge Bins: Use approved storage

silos or surge bins for storing asphalt concrete mixtures. required. Equip the system with an automatic no flow indicator that will automatically shut the plant down when a malfunction causes an improper supply of fiber. For drum plants, add the fiber adjacent to the asphalt cement discharge location.

503.06 DRUM. Equip the drum with automatic burner controls that

continuously agitate aggregates during heating and drying. Provide equipment capable of heating and drying aggrega tes to meet specifications in the necessary quantities to supply the mixing unit continuously at its operating capacity and at a specified temperature and acceptable moisture content. Slope the drum and maintain flights in accordance with manufacturer’s r ecommendations. Produce a uniform blend at the specified production rate, with rapid and complete asphalt coating of aggregate. As a minimum, completely coat 95 percent of the coarse aggregate particles retained on the No. 4 sieve when tested in accordanc e with DOTD TR 328. Process the mixture at the temperature specified on the approved JMF and within ±25°F of the optimum mixing temperature at the discharge. Equip the drum with a thermometer or other temperature device to monitor the discharge temperatur e of the mix. Use temperature recording device or thermometers graduated in maximum 10°F increments with an accuracy of ±5°F and a sensitivity capable of detecting a change of at least 10°F per minute .

503.07 DUST COLLECTION SYST EM. Return the fines from the d ust

collection system at a uniform and regulated rate near the asphalt cement discharge.

503.08 Storage and Loading of Asphalt Concrete

MIXTURES.

503.08.1 Mix Conveyors: Transport the mix directly from plant to

the storage silos or surge bin system by means of an enc losed continuous type conveyor system designed to prevent spillage and match the production rate of the plant. Deliver the mixture to the storage silo or surge bin within ±15°F of plant discharge temperature.

503.08.2 Storage Silos and Surge Bins: Use approved storage

silos or surge bins for storing asphalt concrete mixtures. required. Equip the system with an automatic no flow indicator that will automatically shut the plant down when a malfunction causes an improper supply of fiber. For drum plants, add the fiber adjacent to the asphalt cement discharge location.

503.06 DRUM. Equip the drum with automatic burner controls that

continuously agitate aggregates during heating and drying. Provide equipment capable of heating and drying aggrega tes to meet specifications in the necessary quantities to supply the mixing unit continuously at its operating capacity and at a specified temperature and acceptable moisture content. Slope the drum and maintain flights in accordance with manufacturer’s r ecommendations. Produce a uniform blend at the specified production rate, with rapid and complete asphalt coating of aggregate. As a minimum, completely coat 95 percent of the coarse aggregate particles retained on the No. 4 sieve when tested in accordanc e with DOTD TR 328. Process the mixture at the temperature specified on the approved JMF and within ±25°F of the optimum mixing temperature at the discharge. Equip the drum with a thermometer or other temperature device to monitor the discharge temperatur e of the mix. Use temperature recording device or thermometers graduated in maximum 10°F increments with an accuracy of ±5°F and a sensitivity capable of detecting a change of at least 10°F per minute .

503.07 DUST COLLECTION SYST EM. Return the fines from the d ust

collection system at a uniform and regulated rate near the asphalt cement discharge.

503.08 Storage and Loading of Asphalt Concrete

MIXTURES.

503.08.1 Mix Conveyors: Transport the mix directly from plant to

the storage silos or surge bin system by means of an enc losed continuous type conveyor system designed to prevent spillage and match the production rate of the plant. Deliver the mixture to the storage silo or surge bin within ±15°F of plant discharge temperature.

503.08.2 Storage Silos and Surge Bins: Use approved storage

silos or surge bins for storing asphalt concrete mixtures. Ensure that the use of storage silos or surge bins conform to the limitations on retention time, type of mixture, heater operation, bin atmosphere, bin level or other characteristics set f orth in these specifications and other requirements stated in granting approval of these facilities. Affix an indicator device to each bin, visible to the loading operator, which is activated when material in the bin drops below the top of the sloped port ion. Maintain mixtures above this level during production, except when the plant is not in operation. When the mixture is placed into a silo or bins through a surge device, provide an automatic warning system to audibly warn the operator of a gate malfunction. Ensure silo or bin unloading gates are either clam shell gates operating under gravity feed or other approved gates that will not cause segregation or be detrimental to the mix.

503.08.2 1 Storage Silos: Maintain a uniform mixture

temperature without loc alized heating. Maximum allowable overnight storage time is 18 hours, provided the silo has an oil sealed discharge gate. The Department may approve additional storage time provided test results and other data indicate that the additional storage time is not detrimental to the mix.

503.08.2 2 Surge Bins: Maintain the mixture at a temperature

not less than 25°F below the optimum mixing temperature on the JMF. Do not store the mixture over night.

503.08.2 3 Loading and Sampling: Use haul trucks

conforming to 503.11 . Provide a sturdy secured metal sampling platform, with protective rails, at least 30 square feet in area, and set at the proper height to easily obtain a sample. Protect the sampling platform from loaded trucks with barrier rail. Equip the plant with an approved pressurized system capable of spraying a uniform coating of an approved asphalt mix release agent into the haul unit bed prior to loading. Do not u se diesel as a mix release agent.

503.09 Scales and Meters.

503.09.1 Scales: Provide scales and meters accurate to ±0.5 percent

of the indicated load. Design, construct and install scales and meters so that operations do not affect their accuracy. Calibrate in acco rdance with

503.02.2 Measure all asphalt concrete mixtures by weigh hoppers or truck

platform scales to determine weight for pay. Ensure that the use of storage silos or surge bins conform to the limitations on retention time, type of mixture, heater operation, bin atmosphere, bin level or other characteristics set f orth in these specifications and other requirements stated in granting approval of these facilities. Affix an indicator device to each bin, visible to the loading operator, which is activated when material in the bin drops below the top of the sloped port ion. Maintain mixtures above this level during production, except when the plant is not in operation. When the mixture is placed into a silo or bins through a surge device, provide an automatic warning system to audibly warn the operator of a gate malfunction. Ensure silo or bin unloading gates are either clam shell gates operating under gravity feed or other approved gates that will not cause segregation or be detrimental to the mix.

503.08.2 1 Storage Silos: Maintain a uniform mixture

temperature without loc alized heating. Maximum allowable overnight storage time is 18 hours, provided the silo has an oil sealed discharge gate. The Department may approve additional storage time provided test results and other data indicate that the additional storage time is not detrimental to the mix.

503.08.2 2 Surge Bins: Maintain the mixture at a temperature

not less than 25°F below the optimum mixing temperature on the JMF. Do not store the mixture over night.

503.08.2 3 Loading and Sampling: Use haul trucks

conforming to 503.11 . Provide a sturdy secured metal sampling platform, with protective rails, at least 30 square feet in area, and set at the proper height to easily obtain a sample. Protect the sampling platform from loaded trucks with barrier rail. Equip the plant with an approved pressurized system capable of spraying a uniform coating of an approved asphalt mix release agent into the haul unit bed prior to loading. Do not u se diesel as a mix release agent.

503.09 Scales and Meters.

503.09.1 Scales: Provide scales and meters accurate to ±0.5 percent

of the indicated load. Design, construct and install scales and meters so that operations do not affect their accuracy. Calibrate in acco rdance with

503.02.2 Measure all asphalt concrete mixtures by weigh hoppers or truck

platform scales to determine weight for pay. Ensure that the use of storage silos or surge bins conform to the limitations on retention time, type of mixture, heater operation, bin atmosphere, bin level or other characteristics set f orth in these specifications and other requirements stated in granting approval of these facilities. Affix an indicator device to each bin, visible to the loading operator, which is activated when material in the bin drops below the top of the sloped port ion. Maintain mixtures above this level during production, except when the plant is not in operation. When the mixture is placed into a silo or bins through a surge device, provide an automatic warning system to audibly warn the operator of a gate malfunction. Ensure silo or bin unloading gates are either clam shell gates operating under gravity feed or other approved gates that will not cause segregation or be detrimental to the mix.

503.08.2 1 Storage Silos: Maintain a uniform mixture

temperature without loc alized heating. Maximum allowable overnight storage time is 18 hours, provided the silo has an oil sealed discharge gate. The Department may approve additional storage time provided test results and other data indicate that the additional storage time is not detrimental to the mix.

503.08.2 2 Surge Bins: Maintain the mixture at a temperature

not less than 25°F below the optimum mixing temperature on the JMF. Do not store the mixture over night.

503.08.2 3 Loading and Sampling: Use haul trucks

conforming to 503.11 . Provide a sturdy secured metal sampling platform, with protective rails, at least 30 square feet in area, and set at the proper height to easily obtain a sample. Protect the sampling platform from loaded trucks with barrier rail. Equip the plant with an approved pressurized system capable of spraying a uniform coating of an approved asphalt mix release agent into the haul unit bed prior to loading. Do not u se diesel as a mix release agent.

503.09 Scales and Meters.

503.09.1 Scales: Provide scales and meters accurate to ±0.5 percent

of the indicated load. Design, construct and install scales and meters so that operations do not affect their accuracy. Calibrate in acco rdance with

503.02.2 Measure all asphalt concrete mixtures by weigh hoppers or truck

platform scales to determine weight for pay. Ensure that the use of storage silos or surge bins conform to the limitations on retention time, type of mixture, heater operation, bin atmosphere, bin level or other characteristics set f orth in these specifications and other requirements stated in granting approval of these facilities. Affix an indicator device to each bin, visible to the loading operator, which is activated when material in the bin drops below the top of the sloped port ion. Maintain mixtures above this level during production, except when the plant is not in operation. When the mixture is placed into a silo or bins through a surge device, provide an automatic warning system to audibly warn the operator of a gate malfunction. Ensure silo or bin unloading gates are either clam shell gates operating under gravity feed or other approved gates that will not cause segregation or be detrimental to the mix.

503.08.2 1 Storage Silos: Maintain a uniform mixture

temperature without loc alized heating. Maximum allowable overnight storage time is 18 hours, provided the silo has an oil sealed discharge gate. The Department may approve additional storage time provided test results and other data indicate that the additional storage time is not detrimental to the mix.

503.08.2 2 Surge Bins: Maintain the mixture at a temperature

not less than 25°F below the optimum mixing temperature on the JMF. Do not store the mixture over night.

503.08.2 3 Loading and Sampling: Use haul trucks

conforming to 503.11 . Provide a sturdy secured metal sampling platform, with protective rails, at least 30 square feet in area, and set at the proper height to easily obtain a sample. Protect the sampling platform from loaded trucks with barrier rail. Equip the plant with an approved pressurized system capable of spraying a uniform coating of an approved asphalt mix release agent into the haul unit bed prior to loading. Do not u se diesel as a mix release agent.

503.09 Scales and Meters.

503.09.1 Scales: Provide scales and meters accurate to ±0.5 percent

of the indicated load. Design, construct and install scales and meters so that operations do not affect their accuracy. Calibrate in acco rdance with

503.02.2 Measure all asphalt concrete mixtures by weigh hoppers or truck

platform scales to determine weight for pay. Ensure that the use of storage silos or surge bins conform to the limitations on retention time, type of mixture, heater operation, bin atmosphere, bin level or other characteristics set f orth in these specifications and other requirements stated in granting approval of these facilities. Affix an indicator device to each bin, visible to the loading operator, which is activated when material in the bin drops below the top of the sloped port ion. Maintain mixtures above this level during production, except when the plant is not in operation. When the mixture is placed into a silo or bins through a surge device, provide an automatic warning system to audibly warn the operator of a gate malfunction. Ensure silo or bin unloading gates are either clam shell gates operating under gravity feed or other approved gates that will not cause segregation or be detrimental to the mix.

503.08.2 1 Storage Silos: Maintain a uniform mixture

temperature without loc alized heating. Maximum allowable overnight storage time is 18 hours, provided the silo has an oil sealed discharge gate. The Department may approve additional storage time provided test results and other data indicate that the additional storage time is not detrimental to the mix.

503.08.2 2 Surge Bins: Maintain the mixture at a temperature

not less than 25°F below the optimum mixing temperature on the JMF. Do not store the mixture over night.

503.08.2 3 Loading and Sampling: Use haul trucks

conforming to 503.11 . Provide a sturdy secured metal sampling platform, with protective rails, at least 30 square feet in area, and set at the proper height to easily obtain a sample. Protect the sampling platform from loaded trucks with barrier rail. Equip the plant with an approved pressurized system capable of spraying a uniform coating of an approved asphalt mix release agent into the haul unit bed prior to loading. Do not u se diesel as a mix release agent.

503.09 Scales and Meters.

503.09.1 Scales: Provide scales and meters accurate to ±0.5 percent

of the indicated load. Design, construct and install scales and meters so that operations do not affect their accuracy. Calibrate in acco rdance with

503.02.2 Measure all asphalt concrete mixtures by weigh hoppers or truck

platform scales to determine weight for pay. Ensure that the use of storage silos or surge bins conform to the limitations on retention time, type of mixture, heater operation, bin atmosphere, bin level or other characteristics set f orth in these specifications and other requirements stated in granting approval of these facilities. Affix an indicator device to each bin, visible to the loading operator, which is activated when material in the bin drops below the top of the sloped port ion. Maintain mixtures above this level during production, except when the plant is not in operation. When the mixture is placed into a silo or bins through a surge device, provide an automatic warning system to audibly warn the operator of a gate malfunction. Ensure silo or bin unloading gates are either clam shell gates operating under gravity feed or other approved gates that will not cause segregation or be detrimental to the mix.

503.08.2 1 Storage Silos: Maintain a uniform mixture

temperature without loc alized heating. Maximum allowable overnight storage time is 18 hours, provided the silo has an oil sealed discharge gate. The Department may approve additional storage time provided test results and other data indicate that the additional storage time is not detrimental to the mix.

503.08.2 2 Surge Bins: Maintain the mixture at a temperature

not less than 25°F below the optimum mixing temperature on the JMF. Do not store the mixture over night.

503.08.2 3 Loading and Sampling: Use haul trucks

conforming to 503.11 . Provide a sturdy secured metal sampling platform, with protective rails, at least 30 square feet in area, and set at the proper height to easily obtain a sample. Protect the sampling platform from loaded trucks with barrier rail. Equip the plant with an approved pressurized system capable of spraying a uniform coating of an approved asphalt mix release agent into the haul unit bed prior to loading. Do not u se diesel as a mix release agent.

503.09 Scales and Meters.

503.09.1 Scales: Provide scales and meters accurate to ±0.5 percent

of the indicated load. Design, construct and install scales and meters so that operations do not affect their accuracy. Calibrate in acco rdance with

503.02.2 Measure all asphalt concrete mixtures by weigh hoppers or truck

platform scales to determine weight for pay.

503.09.2 Weigh Hoppers: Provide weigh hoppers to weigh the

mixture or individual material components. Provide hoppers that do not leak or cause segregation. Suspend weigh hoppers from calibrated springless dial scales or load cell scales. Equip the weigh hopper with an approved automatic printer system that will print the certified tare weight of the truck, each batch weight, and total weight of mixture loaded into the truck

503.09.3 Platform Scales: Provide truck platform scales of

sufficient length to weigh the entire unit transporting the mix. Weigh the truck empty to determine tare weight prior to mixture loading. Equip scales with an approved automatic printer system that will print the tare weight as well as the total weight of the unit and the mix.

503.09.4 Printers: Inform the Department in the event of a

breakdown of the printing mechanism. Discontinue operations until the printer is repaired or replaced.

503.10 PAVING EQUIPMENT. The Department will i nspect primary

roadway equipment, including Material Transfer Vehicle (MTV), asphalt distributors, pavers, and rollers, at the start of each project.

503.11 HAUL TRUCKS. The Department will certify haul truck and

trailers with a maximum of three trailer combin ations for legal payload and volume. Comply with load restrictions in accordance with 105.14 . Use trucks having tight, clean, and smooth beds. Spray beds daily or as often as directed with an approved asphalt mix release agent. Provide a canvas or vinyl cover large enough to completely cover the top and extend over the sides of the bed to protect the mixture from the weather or loss of heat. Use sufficient tie -downs to hold the cover. Discharge the mixture in a continuous manner so the spreader apron of the paver or MTV will not be overloaded. If the truck or paver is causing surface tolerance penalties or excessive bumps, discontinue its use. Change equipment or operations when size, speed and condition of trucks interfere with orderly paving operations. Equip haul trucks used for asphalt surface treatments with a mechanism to provide a positive connection to the aggregate spreader.

503.12 ASPHALT MILLING MACHINE. Use an approved self -

propelled milling machine or grinder equipment for milling asphalt surfacing. Provide equipment with sufficient power, traction and stability

503.09.2 Weigh Hoppers: Provide weigh hoppers to weigh the

mixture or individual material components. Provide hoppers that do not leak or cause segregation. Suspend weigh hoppers from calibrated springless dial scales or load cell scales. Equip the weigh hopper with an approved automatic printer system that will print the certified tare weight of the truck, each batch weight, and total weight of mixture loaded into the truck

503.09.3 Platform Scales: Provide truck platform scales of

sufficient length to weigh the entire unit transporting the mix. Weigh the truck empty to determine tare weight prior to mixture loading. Equip scales with an approved automatic printer system that will print the tare weight as well as the total weight of the unit and the mix.

503.09.4 Printers: Inform the Department in the event of a

breakdown of the printing mechanism. Discontinue operations until the printer is repaired or replaced.

503.10 PAVING EQUIPMENT. The Department will i nspect primary

roadway equipment, including Material Transfer Vehicle (MTV), asphalt distributors, pavers, and rollers, at the start of each project.

503.11 HAUL TRUCKS. The Department will certify haul truck and

trailers with a maximum of three trailer combin ations for legal payload and volume. Comply with load restrictions in accordance with 105.14 . Use trucks having tight, clean, and smooth beds. Spray beds daily or as often as directed with an approved asphalt mix release agent. Provide a canvas or vinyl cover large enough to completely cover the top and extend over the sides of the bed to protect the mixture from the weather or loss of heat. Use sufficient tie -downs to hold the cover. Discharge the mixture in a continuous manner so the spreader apron of the paver or MTV will not be overloaded. If the truck or paver is causing surface tolerance penalties or excessive bumps, discontinue its use. Change equipment or operations when size, speed and condition of trucks interfere with orderly paving operations. Equip haul trucks used for asphalt surface treatments with a mechanism to provide a positive connection to the aggregate spreader.

503.12 ASPHALT MILLING MACHINE. Use an approved self -

propelled milling machine or grinder equipment for milling asphalt surfacing. Provide equipment with sufficient power, traction and stability

503.09.2 Weigh Hoppers: Provide weigh hoppers to weigh the

mixture or individual material components. Provide hoppers that do not leak or cause segregation. Suspend weigh hoppers from calibrated springless dial scales or load cell scales. Equip the weigh hopper with an approved automatic printer system that will print the certified tare weight of the truck, each batch weight, and total weight of mixture loaded into the truck

503.09.3 Platform Scales: Provide truck platform scales of

sufficient length to weigh the entire unit transporting the mix. Weigh the truck empty to determine tare weight prior to mixture loading. Equip scales with an approved automatic printer system that will print the tare weight as well as the total weight of the unit and the mix.

503.09.4 Printers: Inform the Department in the event of a

breakdown of the printing mechanism. Discontinue operations until the printer is repaired or replaced.

503.10 PAVING EQUIPMENT. The Department will i nspect primary

roadway equipment, including Material Transfer Vehicle (MTV), asphalt distributors, pavers, and rollers, at the start of each project.

503.11 HAUL TRUCKS. The Department will certify haul truck and

trailers with a maximum of three trailer combin ations for legal payload and volume. Comply with load restrictions in accordance with 105.14 . Use trucks having tight, clean, and smooth beds. Spray beds daily or as often as directed with an approved asphalt mix release agent. Provide a canvas or vinyl cover large enough to completely cover the top and extend over the sides of the bed to protect the mixture from the weather or loss of heat. Use sufficient tie -downs to hold the cover. Discharge the mixture in a continuous manner so the spreader apron of the paver or MTV will not be overloaded. If the truck or paver is causing surface tolerance penalties or excessive bumps, discontinue its use. Change equipment or operations when size, speed and condition of trucks interfere with orderly paving operations. Equip haul trucks used for asphalt surface treatments with a mechanism to provide a positive connection to the aggregate spreader.

503.12 ASPHALT MILLING MACHINE. Use an approved self -

propelled milling machine or grinder equipment for milling asphalt surfacing. Provide equipment with sufficient power, traction and stability

503.09.2 Weigh Hoppers: Provide weigh hoppers to weigh the

mixture or individual material components. Provide hoppers that do not leak or cause segregation. Suspend weigh hoppers from calibrated springless dial scales or load cell scales. Equip the weigh hopper with an approved automatic printer system that will print the certified tare weight of the truck, each batch weight, and total weight of mixture loaded into the truck

503.09.3 Platform Scales: Provide truck platform scales of

sufficient length to weigh the entire unit transporting the mix. Weigh the truck empty to determine tare weight prior to mixture loading. Equip scales with an approved automatic printer system that will print the tare weight as well as the total weight of the unit and the mix.

503.09.4 Printers: Inform the Department in the event of a

breakdown of the printing mechanism. Discontinue operations until the printer is repaired or replaced.

503.10 PAVING EQUIPMENT. The Department will i nspect primary

roadway equipment, including Material Transfer Vehicle (MTV), asphalt distributors, pavers, and rollers, at the start of each project.

503.11 HAUL TRUCKS. The Department will certify haul truck and

trailers with a maximum of three trailer combin ations for legal payload and volume. Comply with load restrictions in accordance with 105.14 . Use trucks having tight, clean, and smooth beds. Spray beds daily or as often as directed with an approved asphalt mix release agent. Provide a canvas or vinyl cover large enough to completely cover the top and extend over the sides of the bed to protect the mixture from the weather or loss of heat. Use sufficient tie -downs to hold the cover. Discharge the mixture in a continuous manner so the spreader apron of the paver or MTV will not be overloaded. If the truck or paver is causing surface tolerance penalties or excessive bumps, discontinue its use. Change equipment or operations when size, speed and condition of trucks interfere with orderly paving operations. Equip haul trucks used for asphalt surface treatments with a mechanism to provide a positive connection to the aggregate spreader.

503.12 ASPHALT MILLING MACHINE. Use an approved self -

propelled milling machine or grinder equipment for milling asphalt surfacing. Provide equipment with sufficient power, traction and stability

503.09.2 Weigh Hoppers: Provide weigh hoppers to weigh the

mixture or individual material components. Provide hoppers that do not leak or cause segregation. Suspend weigh hoppers from calibrated springless dial scales or load cell scales. Equip the weigh hopper with an approved automatic printer system that will print the certified tare weight of the truck, each batch weight, and total weight of mixture loaded into the truck

503.09.3 Platform Scales: Provide truck platform scales of

sufficient length to weigh the entire unit transporting the mix. Weigh the truck empty to determine tare weight prior to mixture loading. Equip scales with an approved automatic printer system that will print the tare weight as well as the total weight of the unit and the mix.

503.09.4 Printers: Inform the Department in the event of a

breakdown of the printing mechanism. Discontinue operations until the printer is repaired or replaced.

503.10 PAVING EQUIPMENT. The Department will i nspect primary

roadway equipment, including Material Transfer Vehicle (MTV), asphalt distributors, pavers, and rollers, at the start of each project.

503.11 HAUL TRUCKS. The Department will certify haul truck and

trailers with a maximum of three trailer combin ations for legal payload and volume. Comply with load restrictions in accordance with 105.14 . Use trucks having tight, clean, and smooth beds. Spray beds daily or as often as directed with an approved asphalt mix release agent. Provide a canvas or vinyl cover large enough to completely cover the top and extend over the sides of the bed to protect the mixture from the weather or loss of heat. Use sufficient tie -downs to hold the cover. Discharge the mixture in a continuous manner so the spreader apron of the paver or MTV will not be overloaded. If the truck or paver is causing surface tolerance penalties or excessive bumps, discontinue its use. Change equipment or operations when size, speed and condition of trucks interfere with orderly paving operations. Equip haul trucks used for asphalt surface treatments with a mechanism to provide a positive connection to the aggregate spreader.

503.12 ASPHALT MILLING MACHINE. Use an approved self -

propelled milling machine or grinder equipment for milling asphalt surfacing. Provide equipment with sufficient power, traction and stability

503.09.2 Weigh Hoppers: Provide weigh hoppers to weigh the

mixture or individual material components. Provide hoppers that do not leak or cause segregation. Suspend weigh hoppers from calibrated springless dial scales or load cell scales. Equip the weigh hopper with an approved automatic printer system that will print the certified tare weight of the truck, each batch weight, and total weight of mixture loaded into the truck

503.09.3 Platform Scales: Provide truck platform scales of

sufficient length to weigh the entire unit transporting the mix. Weigh the truck empty to determine tare weight prior to mixture loading. Equip scales with an approved automatic printer system that will print the tare weight as well as the total weight of the unit and the mix.

503.09.4 Printers: Inform the Department in the event of a

breakdown of the printing mechanism. Discontinue operations until the printer is repaired or replaced.

503.10 PAVING EQUIPMENT. The Department will i nspect primary

roadway equipment, including Material Transfer Vehicle (MTV), asphalt distributors, pavers, and rollers, at the start of each project.

503.11 HAUL TRUCKS. The Department will certify haul truck and

trailers with a maximum of three trailer combin ations for legal payload and volume. Comply with load restrictions in accordance with 105.14 . Use trucks having tight, clean, and smooth beds. Spray beds daily or as often as directed with an approved asphalt mix release agent. Provide a canvas or vinyl cover large enough to completely cover the top and extend over the sides of the bed to protect the mixture from the weather or loss of heat. Use sufficient tie -downs to hold the cover. Discharge the mixture in a continuous manner so the spreader apron of the paver or MTV will not be overloaded. If the truck or paver is causing surface tolerance penalties or excessive bumps, discontinue its use. Change equipment or operations when size, speed and condition of trucks interfere with orderly paving operations. Equip haul trucks used for asphalt surface treatments with a mechanism to provide a positive connection to the aggregate spreader.

503.12 ASPHALT MILLING MACHINE. Use an approved self -

propelled milling machine or grinder equipment for milling asphalt surfacing. Provide equipment with sufficient power, traction and stability

503.09.2 Weigh Hoppers: Provide weigh hoppers to weigh the

mixture or individual material components. Provide hoppers that do not leak or cause segregation. Suspend weigh hoppers from calibrated springless dial scales or load cell scales. Equip the weigh hopper with an approved automatic printer system that will print the certified tare weight of the truck, each batch weight, and total weight of mixture loaded into the truck

503.09.3 Platform Scales: Provide truck platform scales of

sufficient length to weigh the entire unit transporting the mix. Weigh the truck empty to determine tare weight prior to mixture loading. Equip scales with an approved automatic printer system that will print the tare weight as well as the total weight of the unit and the mix.

503.09.4 Printers: Inform the Department in the event of a

breakdown of the printing mechanism. Discontinue operations until the printer is repaired or replaced.

503.10 PAVING EQUIPMENT. The Department will i nspect primary

roadway equipment, including Material Transfer Vehicle (MTV), asphalt distributors, pavers, and rollers, at the start of each project.

503.11 HAUL TRUCKS. The Department will certify haul truck and

trailers with a maximum of three trailer combin ations for legal payload and volume. Comply with load restrictions in accordance with 105.14 . Use trucks having tight, clean, and smooth beds. Spray beds daily or as often as directed with an approved asphalt mix release agent. Provide a canvas or vinyl cover large enough to completely cover the top and extend over the sides of the bed to protect the mixture from the weather or loss of heat. Use sufficient tie -downs to hold the cover. Discharge the mixture in a continuous manner so the spreader apron of the paver or MTV will not be overloaded. If the truck or paver is causing surface tolerance penalties or excessive bumps, discontinue its use. Change equipment or operations when size, speed and condition of trucks interfere with orderly paving operations. Equip haul trucks used for asphalt surface treatments with a mechanism to provide a positive connection to the aggregate spreader.

503.12 ASPHALT MILLING MACHINE. Use an approved self -

propelled milling machine or grinder equipment for milling asphalt surfacing. Provide equipment with sufficient power, traction and stability to remove the thickness of asphalt concrete necessary to provide profile grade a nd cross slope uniformly across the surface. Provide milling equipment capable of controlling grade or cross -slope from an erected stringline, shoe device or approved traveling reference plane that will accurately reflect the average grade of the surface on which it is to be operated and have an automatic system for controlling cross slope at a given rate. The drum shall be round and true with sufficient number of teeth to yield a uniform and fine textured surface. Equip the milling machine with means to control dust created by the cutting action. Provide adequate loading equipment to immediately remove materials cut from the surface and discharge the cuttings into a truck or on the shoulder as specified or directed.

503.13 ASPHALT DISTRIBUTORS . Provide equip ment that ensures

even distribution of the asphalt or asphalt emulsion across the entire pavement area at the specified rate as measured per ASTM D2995.

503.13.1 Distributors: The asphalt cement distributor shall be

capable of maintaining the allowable variation from any specified rate within ±0.02 gallons per square yard. Equip the distributor with a height adjustable spray bar with spray nozzles recommended by the manufacturer. Assure that the end nozzle over the roadway edge provides a sharp line of asphalt m aterial parallel to the direction of travel. Ensure nozzles remain clean and free from blockage. Provide means for an accurate and rapid determination of the control and amount of asphalt materials being applied per square yard of surface. Equip the distr ibutor with thermometers to indicate the temperature of the material in the tank. Equip the distributor with a hand -held spray attachment for applying asphalt materials to areas inaccessible with the spray bar. Within 12 months prior to use, calibrate the asphalt distributor in accordance with ASTM D 2995. Provide the ASTM calibration and furnish the engineer an accurate and satisfactory calibration record prior to beginning the work. The engineer may at any time require verification of calibration accuracy of the asphalt distributor in accordance with ASTM D 2995.

503.14 MATERIAL TRANSFER VE HICLE (MTV). When placing the

final two lifts of asphalt concrete on the roadway travel lanes, use a material transfer vehicle (MTV) or lightweight MTV to deliver mixtures to remove the thickness of asphalt concrete necessary to provide profile grade a nd cross slope uniformly across the surface. Provide milling equipment capable of controlling grade or cross -slope from an erected stringline, shoe device or approved traveling reference plane that will accurately reflect the average grade of the surface on which it is to be operated and have an automatic system for controlling cross slope at a given rate. The drum shall be round and true with sufficient number of teeth to yield a uniform and fine textured surface. Equip the milling machine with means to control dust created by the cutting action. Provide adequate loading equipment to immediately remove materials cut from the surface and discharge the cuttings into a truck or on the shoulder as specified or directed.

503.13 ASPHALT DISTRIBUTORS . Provide equip ment that ensures

even distribution of the asphalt or asphalt emulsion across the entire pavement area at the specified rate as measured per ASTM D2995.

503.13.1 Distributors: The asphalt cement distributor shall be

capable of maintaining the allowable variation from any specified rate within ±0.02 gallons per square yard. Equip the distributor with a height adjustable spray bar with spray nozzles recommended by the manufacturer. Assure that the end nozzle over the roadway edge provides a sharp line of asphalt m aterial parallel to the direction of travel. Ensure nozzles remain clean and free from blockage. Provide means for an accurate and rapid determination of the control and amount of asphalt materials being applied per square yard of surface. Equip the distr ibutor with thermometers to indicate the temperature of the material in the tank. Equip the distributor with a hand -held spray attachment for applying asphalt materials to areas inaccessible with the spray bar. Within 12 months prior to use, calibrate the asphalt distributor in accordance with ASTM D 2995. Provide the ASTM calibration and furnish the engineer an accurate and satisfactory calibration record prior to beginning the work. The engineer may at any time require verification of calibration accuracy of the asphalt distributor in accordance with ASTM D 2995.

503.14 MATERIAL TRANSFER VE HICLE (MTV). When placing the

final two lifts of asphalt concrete on the roadway travel lanes, use a material transfer vehicle (MTV) or lightweight MTV to deliver mixtures to remove the thickness of asphalt concrete necessary to provide profile grade a nd cross slope uniformly across the surface. Provide milling equipment capable of controlling grade or cross -slope from an erected stringline, shoe device or approved traveling reference plane that will accurately reflect the average grade of the surface on which it is to be operated and have an automatic system for controlling cross slope at a given rate. The drum shall be round and true with sufficient number of teeth to yield a uniform and fine textured surface. Equip the milling machine with means to control dust created by the cutting action. Provide adequate loading equipment to immediately remove materials cut from the surface and discharge the cuttings into a truck or on the shoulder as specified or directed.

503.13 ASPHALT DISTRIBUTORS . Provide equip ment that ensures

even distribution of the asphalt or asphalt emulsion across the entire pavement area at the specified rate as measured per ASTM D2995.

503.13.1 Distributors: The asphalt cement distributor shall be

capable of maintaining the allowable variation from any specified rate within ±0.02 gallons per square yard. Equip the distributor with a height adjustable spray bar with spray nozzles recommended by the manufacturer. Assure that the end nozzle over the roadway edge provides a sharp line of asphalt m aterial parallel to the direction of travel. Ensure nozzles remain clean and free from blockage. Provide means for an accurate and rapid determination of the control and amount of asphalt materials being applied per square yard of surface. Equip the distr ibutor with thermometers to indicate the temperature of the material in the tank. Equip the distributor with a hand -held spray attachment for applying asphalt materials to areas inaccessible with the spray bar. Within 12 months prior to use, calibrate the asphalt distributor in accordance with ASTM D 2995. Provide the ASTM calibration and furnish the engineer an accurate and satisfactory calibration record prior to beginning the work. The engineer may at any time require verification of calibration accuracy of the asphalt distributor in accordance with ASTM D 2995.

503.14 MATERIAL TRANSFER VE HICLE (MTV). When placing the

final two lifts of asphalt concrete on the roadway travel lanes, use a material transfer vehicle (MTV) or lightweight MTV to deliver mixtures to remove the thickness of asphalt concrete necessary to provide profile grade a nd cross slope uniformly across the surface. Provide milling equipment capable of controlling grade or cross -slope from an erected stringline, shoe device or approved traveling reference plane that will accurately reflect the average grade of the surface on which it is to be operated and have an automatic system for controlling cross slope at a given rate. The drum shall be round and true with sufficient number of teeth to yield a uniform and fine textured surface. Equip the milling machine with means to control dust created by the cutting action. Provide adequate loading equipment to immediately remove materials cut from the surface and discharge the cuttings into a truck or on the shoulder as specified or directed.

503.13 ASPHALT DISTRIBUTORS . Provide equip ment that ensures

even distribution of the asphalt or asphalt emulsion across the entire pavement area at the specified rate as measured per ASTM D2995.

503.13.1 Distributors: The asphalt cement distributor shall be

capable of maintaining the allowable variation from any specified rate within ±0.02 gallons per square yard. Equip the distributor with a height adjustable spray bar with spray nozzles recommended by the manufacturer. Assure that the end nozzle over the roadway edge provides a sharp line of asphalt m aterial parallel to the direction of travel. Ensure nozzles remain clean and free from blockage. Provide means for an accurate and rapid determination of the control and amount of asphalt materials being applied per square yard of surface. Equip the distr ibutor with thermometers to indicate the temperature of the material in the tank. Equip the distributor with a hand -held spray attachment for applying asphalt materials to areas inaccessible with the spray bar. Within 12 months prior to use, calibrate the asphalt distributor in accordance with ASTM D 2995. Provide the ASTM calibration and furnish the engineer an accurate and satisfactory calibration record prior to beginning the work. The engineer may at any time require verification of calibration accuracy of the asphalt distributor in accordance with ASTM D 2995.

503.14 MATERIAL TRANSFER VE HICLE (MTV). When placing the

final two lifts of asphalt concrete on the roadway travel lanes, use a material transfer vehicle (MTV) or lightweight MTV to deliver mixtures from the hauling equipment to the paving equipment, and to minimize thermal and material segregation of the hot mix asphalt concrete. Ensure that the MTV provides additional mixing of the asphalt concrete mixtures and then deposits the mixture into the pavi ng equipment hopper to reduce segregation and facilitate continuous production. At a minimum, provide an MTV with a high capacity truck unloading system, which will receive mixtures from the hauling equipment; a 20 ton storage bin in the MTV to continuous ly mix the mixture prior to discharge to a conveyor system; a discharge conveyor, with the ability to swivel, delivering the mixture to a paving equipment hopper while allowing the MTV to operate from an adjacent lane. If the weight of the MTV is determin ed by the engineer to cause settlement or movement in the base or sub -base, discontinue use. If the problem persists with the use of a lightweight MTV, discontinue use of the MTV. When a malfunction occurs in the MTV during lay-down operations, immediate ly discontinue plant operations and do not resume until the MTV malfunctions have been remedied. Mixtures in the silo (≤ 100 tons) or materials in transit may be placed. Due to the weight of the loaded MTV, apply the following restrictions at bridge cro ssings:

503.14.1 Lightweight MTV: The lightweight MTV has a smaller

capacity, is more fuel efficient and may be used in lieu of the MTV. Lightweight MTV’s must meet all requirements of the 503.14 MTV and as modified herein. Use a Thermal Profile system in accordance with section

503.14.3 at all times when a lightweight MTV is used in lieu of the MTV.

Discontinue use of lightweight MTV when thermal segregation is observed The requirement of the 20 ton storage hopper is waived for all lightweight MTVs. The approved re mixing methods for lightweight MTV’s are:

503.14.1 Lightweight MTV: The lightweight MTV has a smaller

capacity, is more fuel efficient and may be used in lieu of the MTV. Lightweight MTV’s must meet all requirements of the 503.14 MTV and as modified herein. Use a Thermal Profile system in accordance with section

503.14.3 at all times when a lightweight MTV is used in lieu of the MTV.

Discontinue use of lightweight MTV when thermal segregation is observed The requirement of the 20 ton storage hopper is waived for all lightweight MTVs. The approved re mixing methods for lightweight MTV’s are:

503.14.2 Windrow Paving: Windrow paving is allowed with the

use of an MTV and thermal profile system. Equip the MTV with a windrow head attachment capable of removing 95 percent of the mixture off the pavement. Use a thermal profile system meeting 503.14.3 .

503.14.3 Thermal Profile System: The thermal Profile System

may be used on all projects. The Thermal Profile System is a device capable of continuously recording the temperature of the full width of pavement as the mixture exits the paver with constant record of the GPS location and distance traveled. The thermal profi les system is required when using a lightweight MTV as described in section 503.13 .2. The system requirements include the capability to provide the engineer with t he thermal profile of every roadway sublot and roadway lot. Mount the system with a recording device to the back of the paver. Provide capability of instant review of data on project site at any time keeping permanent record of all temperature and locati on data daily.

503.15 PAVERS. Use pavers with an automatic grade control device

(dual grade may be required) and slope control devices for use with an approved traveling reference plane or erected stringline, as directed. Use pavers capable of placing mixtures within specified tolerances. Use a screed or strike -off assembly to distribute the mixture over the entire paving strip. The width of the paving strip must be acceptable to the engineer. Use screed, including screed extensions, to place mixtures that are uniform in appearance and quality. Adjust the screed assembly to provide the required cross section. Equip the screed (including screed extensions) with a heater and a vibrator. Use a paver insert hopper, in conjunction with the MTV, with a minimum capacity of 5 tons (5 mg). Equip pavers with hoppers adequately designed and maintained to prevent spillage. Equip pavers with augers to place the mix evenly in front of the screed, including extensions. Equip pavers with a quick and efficient steering device capable of traveling both forward and in reverse. Provide pavers capable of spreading mixes to required thickness without segregation or tearing. For shoulder construction or other incidental applications, use modified pavers or widening machines when permitted. A tracked or high flotation tires are required for the undercarriage of the MTV to facilitate low ground pressure (< 5 5 psi).

503.14.2 Windrow Paving: Windrow paving is allowed with the

use of an MTV and thermal profile system. Equip the MTV with a windrow head attachment capable of removing 95 percent of the mixture off the pavement. Use a thermal profile system meeting 503.14.3 .

503.14.3 Thermal Profile System: The thermal Profile System

may be used on all projects. The Thermal Profile System is a device capable of continuously recording the temperature of the full width of pavement as the mixture exits the paver with constant record of the GPS location and distance traveled. The thermal profi les system is required when using a lightweight MTV as described in section 503.13 .2. The system requirements include the capability to provide the engineer with t he thermal profile of every roadway sublot and roadway lot. Mount the system with a recording device to the back of the paver. Provide capability of instant review of data on project site at any time keeping permanent record of all temperature and locati on data daily.

503.15 PAVERS. Use pavers with an automatic grade control device

(dual grade may be required) and slope control devices for use with an approved traveling reference plane or erected stringline, as directed. Use pavers capable of placing mixtures within specified tolerances. Use a screed or strike -off assembly to distribute the mixture over the entire paving strip. The width of the paving strip must be acceptable to the engineer. Use screed, including screed extensions, to place mixtures that are uniform in appearance and quality. Adjust the screed assembly to provide the required cross section. Equip the screed (including screed extensions) with a heater and a vibrator. Use a paver insert hopper, in conjunction with the MTV, with a minimum capacity of 5 tons (5 mg). Equip pavers with hoppers adequately designed and maintained to prevent spillage. Equip pavers with augers to place the mix evenly in front of the screed, including extensions. Equip pavers with a quick and efficient steering device capable of traveling both forward and in reverse. Provide pavers capable of spreading mixes to required thickness without segregation or tearing. For shoulder construction or other incidental applications, use modified pavers or widening machines when permitted. A tracked or high flotation tires are required for the undercarriage of the MTV to facilitate low ground pressure (< 5 5 psi).

503.14.2 Windrow Paving: Windrow paving is allowed with the

use of an MTV and thermal profile system. Equip the MTV with a windrow head attachment capable of removing 95 percent of the mixture off the pavement. Use a thermal profile system meeting 503.14.3 .

503.14.3 Thermal Profile System: The thermal Profile System

may be used on all projects. The Thermal Profile System is a device capable of continuously recording the temperature of the full width of pavement as the mixture exits the paver with constant record of the GPS location and distance traveled. The thermal profi les system is required when using a lightweight MTV as described in section 503.13 .2. The system requirements include the capability to provide the engineer with t he thermal profile of every roadway sublot and roadway lot. Mount the system with a recording device to the back of the paver. Provide capability of instant review of data on project site at any time keeping permanent record of all temperature and locati on data daily.

503.15 PAVERS. Use pavers with an automatic grade control device

(dual grade may be required) and slope control devices for use with an approved traveling reference plane or erected stringline, as directed. Use pavers capable of placing mixtures within specified tolerances. Use a screed or strike -off assembly to distribute the mixture over the entire paving strip. The width of the paving strip must be acceptable to the engineer. Use screed, including screed extensions, to place mixtures that are uniform in appearance and quality. Adjust the screed assembly to provide the required cross section. Equip the screed (including screed extensions) with a heater and a vibrator. Use a paver insert hopper, in conjunction with the MTV, with a minimum capacity of 5 tons (5 mg). Equip pavers with hoppers adequately designed and maintained to prevent spillage. Equip pavers with augers to place the mix evenly in front of the screed, including extensions. Equip pavers with a quick and efficient steering device capable of traveling both forward and in reverse. Provide pavers capable of spreading mixes to required thickness without segregation or tearing. For shoulder construction or other incidental applications, use modified pavers or widening machines when permitted. A tracked or high flotation tires are required for the undercarriage of the MTV to facilitate low ground pressure (< 5 5 psi).

503.14.2 Windrow Paving: Windrow paving is allowed with the

use of an MTV and thermal profile system. Equip the MTV with a windrow head attachment capable of removing 95 percent of the mixture off the pavement. Use a thermal profile system meeting 503.14.3 .

503.14.3 Thermal Profile System: The thermal Profile System

may be used on all projects. The Thermal Profile System is a device capable of continuously recording the temperature of the full width of pavement as the mixture exits the paver with constant record of the GPS location and distance traveled. The thermal profi les system is required when using a lightweight MTV as described in section 503.13 .2. The system requirements include the capability to provide the engineer with t he thermal profile of every roadway sublot and roadway lot. Mount the system with a recording device to the back of the paver. Provide capability of instant review of data on project site at any time keeping permanent record of all temperature and locati on data daily.

503.15 PAVERS. Use pavers with an automatic grade control device

(dual grade may be required) and slope control devices for use with an approved traveling reference plane or erected stringline, as directed. Use pavers capable of placing mixtures within specified tolerances. Use a screed or strike -off assembly to distribute the mixture over the entire paving strip. The width of the paving strip must be acceptable to the engineer. Use screed, including screed extensions, to place mixtures that are uniform in appearance and quality. Adjust the screed assembly to provide the required cross section. Equip the screed (including screed extensions) with a heater and a vibrator. Use a paver insert hopper, in conjunction with the MTV, with a minimum capacity of 5 tons (5 mg). Equip pavers with hoppers adequately designed and maintained to prevent spillage. Equip pavers with augers to place the mix evenly in front of the screed, including extensions. Equip pavers with a quick and efficient steering device capable of traveling both forward and in reverse. Provide pavers capable of spreading mixes to required thickness without segregation or tearing. For shoulder construction or other incidental applications, use modified pavers or widening machines when permitted. Use auger assembly extensions when screed extensions in excess of 2 feet on a side are to be continuously used in the pavement operation. Extend such auger extensions to within 2 feet of the end of the screed. With approval, the use of an auger extension with screed extensions in excess of 2 feet on one side may be waived for transitions, taper sections and similar short sections. Do not use a strike -off assembly or boxed extension for paving within the traveled way, except when approved for short irregular sections or non - typical sections. Ensure that the vibratory screed crowns the pavement with adjustable extensions to accommodate the desired pavement profile.

503.15.1 Spray Paver: Spray pavers are designed to distribute the

tack coat immediately before placing the asphalt mixture. Comply with

503.13.1 and ensure that spray pavers evenly distribute the tack coat and

apply and level thin asphalt concrete concurrently at a rate of 30 to 92 feet per minute. Do not allow a wheel or other part of the pavin g machine to come in contact with the tack coat before the hot mix asphalt concrete wearing course is applied. Equip the spray paver to include a receiving hopper, feed system, insulated storage chamber for the tack coat, spray bar, tanks with calibrated load cells, and a variable width heated screed unit.

503.16 Compaction Equipment .

503.16.1 General: Provide self -propelled compaction equipment

capable of reversing without backlash. Establish a rolling pattern and provide the number, type and size of rollers sufficie nt to compact the mixture to the specified density and surface smoothness.

503.16.2 Steel Wheel Rollers: Use either vibratory or non -

vibratory steel wheel rollers. Equip the roller with wheels that are true to round and equipped with suitable scrapers and water ing devices. Design vibratory rollers for asphalt concrete compaction having separate controls for frequency, amplitude and propulsion.

503.16.3 Pneumatic Tire Rollers: Use treadless tires that are the

same size and ply rating, and inflated to a uniform pressur e not varying more than ±5 psi between tires. Equip tires with scrapers to prevent adhesion of mixture. The engineer may require additional cleaning and water apparatus on tires if material adhesion is detrimental to the mat.

503.16.4 Equipment for Asphalt Surfac e Treatments (AST).

503.16.4 1 Pneumatic Tire Rollers for AST: Use a minimum

Use auger assembly extensions when screed extensions in excess of 2 feet on a side are to be continuously used in the pavement operation. Extend such auger extensions to within 2 feet of the end of the screed. With approval, the use of an auger extension with screed extensions in excess of 2 feet on one side may be waived for transitions, taper sections and similar short sections. Do not use a strike -off assembly or boxed extension for paving within the traveled way, except when approved for short irregular sections or non - typical sections. Ensure that the vibratory screed crowns the pavement with adjustable extensions to accommodate the desired pavement profile.

503.15.1 Spray Paver: Spray pavers are designed to distribute the

tack coat immediately before placing the asphalt mixture. Comply with

503.13.1 and ensure that spray pavers evenly distribute the tack coat and

apply and level thin asphalt concrete concurrently at a rate of 30 to 92 feet per minute. Do not allow a wheel or other part of the pavin g machine to come in contact with the tack coat before the hot mix asphalt concrete wearing course is applied. Equip the spray paver to include a receiving hopper, feed system, insulated storage chamber for the tack coat, spray bar, tanks with calibrated load cells, and a variable width heated screed unit.

503.16 Compaction Equipment .

503.16.1 General: Provide self -propelled compaction equipment

capable of reversing without backlash. Establish a rolling pattern and provide the number, type and size of rollers sufficie nt to compact the mixture to the specified density and surface smoothness.

503.16.2 Steel Wheel Rollers: Use either vibratory or non -

vibratory steel wheel rollers. Equip the roller with wheels that are true to round and equipped with suitable scrapers and water ing devices. Design vibratory rollers for asphalt concrete compaction having separate controls for frequency, amplitude and propulsion.

503.16.3 Pneumatic Tire Rollers: Use treadless tires that are the

same size and ply rating, and inflated to a uniform pressur e not varying more than ±5 psi between tires. Equip tires with scrapers to prevent adhesion of mixture. The engineer may require additional cleaning and water apparatus on tires if material adhesion is detrimental to the mat.

503.16.4 Equipment for Asphalt Surfac e Treatments (AST).

503.16.4 1 Pneumatic Tire Rollers for AST: Use a minimum

Use auger assembly extensions when screed extensions in excess of 2 feet on a side are to be continuously used in the pavement operation. Extend such auger extensions to within 2 feet of the end of the screed. With approval, the use of an auger extension with screed extensions in excess of 2 feet on one side may be waived for transitions, taper sections and similar short sections. Do not use a strike -off assembly or boxed extension for paving within the traveled way, except when approved for short irregular sections or non - typical sections. Ensure that the vibratory screed crowns the pavement with adjustable extensions to accommodate the desired pavement profile.

503.15.1 Spray Paver: Spray pavers are designed to distribute the

tack coat immediately before placing the asphalt mixture. Comply with

503.13.1 and ensure that spray pavers evenly distribute the tack coat and

apply and level thin asphalt concrete concurrently at a rate of 30 to 92 feet per minute. Do not allow a wheel or other part of the pavin g machine to come in contact with the tack coat before the hot mix asphalt concrete wearing course is applied. Equip the spray paver to include a receiving hopper, feed system, insulated storage chamber for the tack coat, spray bar, tanks with calibrated load cells, and a variable width heated screed unit.

503.16 Compaction Equipment .

503.16.1 General: Provide self -propelled compaction equipment

capable of reversing without backlash. Establish a rolling pattern and provide the number, type and size of rollers sufficie nt to compact the mixture to the specified density and surface smoothness.

503.16.2 Steel Wheel Rollers: Use either vibratory or non -

vibratory steel wheel rollers. Equip the roller with wheels that are true to round and equipped with suitable scrapers and water ing devices. Design vibratory rollers for asphalt concrete compaction having separate controls for frequency, amplitude and propulsion.

503.16.3 Pneumatic Tire Rollers: Use treadless tires that are the

same size and ply rating, and inflated to a uniform pressur e not varying more than ±5 psi between tires. Equip tires with scrapers to prevent adhesion of mixture. The engineer may require additional cleaning and water apparatus on tires if material adhesion is detrimental to the mat.

503.16.4 Equipment for Asphalt Surfac e Treatments (AST).

503.16.4 1 Pneumatic Tire Rollers for AST: Use a minimum

Use auger assembly extensions when screed extensions in excess of 2 feet on a side are to be continuously used in the pavement operation. Extend such auger extensions to within 2 feet of the end of the screed. With approval, the use of an auger extension with screed extensions in excess of 2 feet on one side may be waived for transitions, taper sections and similar short sections. Do not use a strike -off assembly or boxed extension for paving within the traveled way, except when approved for short irregular sections or non - typical sections. Ensure that the vibratory screed crowns the pavement with adjustable extensions to accommodate the desired pavement profile.

503.15.1 Spray Paver: Spray pavers are designed to distribute the

tack coat immediately before placing the asphalt mixture. Comply with

503.13.1 and ensure that spray pavers evenly distribute the tack coat and

apply and level thin asphalt concrete concurrently at a rate of 30 to 92 feet per minute. Do not allow a wheel or other part of the pavin g machine to come in contact with the tack coat before the hot mix asphalt concrete wearing course is applied. Equip the spray paver to include a receiving hopper, feed system, insulated storage chamber for the tack coat, spray bar, tanks with calibrated load cells, and a variable width heated screed unit.

503.16 Compaction Equipment .

503.16.1 General: Provide self -propelled compaction equipment

capable of reversing without backlash. Establish a rolling pattern and provide the number, type and size of rollers sufficie nt to compact the mixture to the specified density and surface smoothness.

503.16.2 Steel Wheel Rollers: Use either vibratory or non -

vibratory steel wheel rollers. Equip the roller with wheels that are true to round and equipped with suitable scrapers and water ing devices. Design vibratory rollers for asphalt concrete compaction having separate controls for frequency, amplitude and propulsion.

503.16.3 Pneumatic Tire Rollers: Use treadless tires that are the

same size and ply rating, and inflated to a uniform pressur e not varying more than ±5 psi between tires. Equip tires with scrapers to prevent adhesion of mixture. The engineer may require additional cleaning and water apparatus on tires if material adhesion is detrimental to the mat.

503.16.4 Equipment for Asphalt Surfac e Treatments (AST).

503.16.4 1 Pneumatic Tire Rollers for AST: Use a minimum

Use auger assembly extensions when screed extensions in excess of 2 feet on a side are to be continuously used in the pavement operation. Extend such auger extensions to within 2 feet of the end of the screed. With approval, the use of an auger extension with screed extensions in excess of 2 feet on one side may be waived for transitions, taper sections and similar short sections. Do not use a strike -off assembly or boxed extension for paving within the traveled way, except when approved for short irregular sections or non - typical sections. Ensure that the vibratory screed crowns the pavement with adjustable extensions to accommodate the desired pavement profile.

503.15.1 Spray Paver: Spray pavers are designed to distribute the

tack coat immediately before placing the asphalt mixture. Comply with

503.13.1 and ensure that spray pavers evenly distribute the tack coat and

apply and level thin asphalt concrete concurrently at a rate of 30 to 92 feet per minute. Do not allow a wheel or other part of the pavin g machine to come in contact with the tack coat before the hot mix asphalt concrete wearing course is applied. Equip the spray paver to include a receiving hopper, feed system, insulated storage chamber for the tack coat, spray bar, tanks with calibrated load cells, and a variable width heated screed unit.

503.16 Compaction Equipment .

503.16.1 General: Provide self -propelled compaction equipment

capable of reversing without backlash. Establish a rolling pattern and provide the number, type and size of rollers sufficie nt to compact the mixture to the specified density and surface smoothness.

503.16.2 Steel Wheel Rollers: Use either vibratory or non -

vibratory steel wheel rollers. Equip the roller with wheels that are true to round and equipped with suitable scrapers and water ing devices. Design vibratory rollers for asphalt concrete compaction having separate controls for frequency, amplitude and propulsion.

503.16.3 Pneumatic Tire Rollers: Use treadless tires that are the

same size and ply rating, and inflated to a uniform pressur e not varying more than ±5 psi between tires. Equip tires with scrapers to prevent adhesion of mixture. The engineer may require additional cleaning and water apparatus on tires if material adhesion is detrimental to the mat.

503.16.4 Equipment for Asphalt Surfac e Treatments (AST).

503.16.4 1 Pneumatic Tire Rollers for AST: Use a minimum

Use auger assembly extensions when screed extensions in excess of 2 feet on a side are to be continuously used in the pavement operation. Extend such auger extensions to within 2 feet of the end of the screed. With approval, the use of an auger extension with screed extensions in excess of 2 feet on one side may be waived for transitions, taper sections and similar short sections. Do not use a strike -off assembly or boxed extension for paving within the traveled way, except when approved for short irregular sections or non - typical sections. Ensure that the vibratory screed crowns the pavement with adjustable extensions to accommodate the desired pavement profile.

503.15.1 Spray Paver: Spray pavers are designed to distribute the

tack coat immediately before placing the asphalt mixture. Comply with

503.13.1 and ensure that spray pavers evenly distribute the tack coat and

apply and level thin asphalt concrete concurrently at a rate of 30 to 92 feet per minute. Do not allow a wheel or other part of the pavin g machine to come in contact with the tack coat before the hot mix asphalt concrete wearing course is applied. Equip the spray paver to include a receiving hopper, feed system, insulated storage chamber for the tack coat, spray bar, tanks with calibrated load cells, and a variable width heated screed unit.

503.16 Compaction Equipment .

503.16.1 General: Provide self -propelled compaction equipment

capable of reversing without backlash. Establish a rolling pattern and provide the number, type and size of rollers sufficie nt to compact the mixture to the specified density and surface smoothness.

503.16.2 Steel Wheel Rollers: Use either vibratory or non -

vibratory steel wheel rollers. Equip the roller with wheels that are true to round and equipped with suitable scrapers and water ing devices. Design vibratory rollers for asphalt concrete compaction having separate controls for frequency, amplitude and propulsion.

503.16.3 Pneumatic Tire Rollers: Use treadless tires that are the

same size and ply rating, and inflated to a uniform pressur e not varying more than ±5 psi between tires. Equip tires with scrapers to prevent adhesion of mixture. The engineer may require additional cleaning and water apparatus on tires if material adhesion is detrimental to the mat.

503.16.4 Equipment for Asphalt Surfac e Treatments (AST).

503.16.4 1 Pneumatic Tire Rollers for AST: Use a minimum

Use auger assembly extensions when screed extensions in excess of 2 feet on a side are to be continuously used in the pavement operation. Extend such auger extensions to within 2 feet of the end of the screed. With approval, the use of an auger extension with screed extensions in excess of 2 feet on one side may be waived for transitions, taper sections and similar short sections. Do not use a strike -off assembly or boxed extension for paving within the traveled way, except when approved for short irregular sections or non - typical sections. Ensure that the vibratory screed crowns the pavement with adjustable extensions to accommodate the desired pavement profile.

503.15.1 Spray Paver: Spray pavers are designed to distribute the

tack coat immediately before placing the asphalt mixture. Comply with

503.13.1 and ensure that spray pavers evenly distribute the tack coat and

apply and level thin asphalt concrete concurrently at a rate of 30 to 92 feet per minute. Do not allow a wheel or other part of the pavin g machine to come in contact with the tack coat before the hot mix asphalt concrete wearing course is applied. Equip the spray paver to include a receiving hopper, feed system, insulated storage chamber for the tack coat, spray bar, tanks with calibrated load cells, and a variable width heated screed unit.

503.16 Compaction Equipment .

503.16.1 General: Provide self -propelled compaction equipment

capable of reversing without backlash. Establish a rolling pattern and provide the number, type and size of rollers sufficie nt to compact the mixture to the specified density and surface smoothness.

503.16.2 Steel Wheel Rollers: Use either vibratory or non -

vibratory steel wheel rollers. Equip the roller with wheels that are true to round and equipped with suitable scrapers and water ing devices. Design vibratory rollers for asphalt concrete compaction having separate controls for frequency, amplitude and propulsion.

503.16.3 Pneumatic Tire Rollers: Use treadless tires that are the

same size and ply rating, and inflated to a uniform pressur e not varying more than ±5 psi between tires. Equip tires with scrapers to prevent adhesion of mixture. The engineer may require additional cleaning and water apparatus on tires if material adhesion is detrimental to the mat.

503.16.4 Equipment for Asphalt Surfac e Treatments (AST).

503.16.4 1 Pneumatic Tire Rollers for AST: Use a minimum

Use auger assembly extensions when screed extensions in excess of 2 feet on a side are to be continuously used in the pavement operation. Extend such auger extensions to within 2 feet of the end of the screed. With approval, the use of an auger extension with screed extensions in excess of 2 feet on one side may be waived for transitions, taper sections and similar short sections. Do not use a strike -off assembly or boxed extension for paving within the traveled way, except when approved for short irregular sections or non - typical sections. Ensure that the vibratory screed crowns the pavement with adjustable extensions to accommodate the desired pavement profile.

503.15.1 Spray Paver: Spray pavers are designed to distribute the

tack coat immediately before placing the asphalt mixture. Comply with

503.13.1 and ensure that spray pavers evenly distribute the tack coat and

apply and level thin asphalt concrete concurrently at a rate of 30 to 92 feet per minute. Do not allow a wheel or other part of the pavin g machine to come in contact with the tack coat before the hot mix asphalt concrete wearing course is applied. Equip the spray paver to include a receiving hopper, feed system, insulated storage chamber for the tack coat, spray bar, tanks with calibrated load cells, and a variable width heated screed unit.

503.16 Compaction Equipment .

503.16.1 General: Provide self -propelled compaction equipment

capable of reversing without backlash. Establish a rolling pattern and provide the number, type and size of rollers sufficie nt to compact the mixture to the specified density and surface smoothness.

503.16.2 Steel Wheel Rollers: Use either vibratory or non -

vibratory steel wheel rollers. Equip the roller with wheels that are true to round and equipped with suitable scrapers and water ing devices. Design vibratory rollers for asphalt concrete compaction having separate controls for frequency, amplitude and propulsion.

503.16.3 Pneumatic Tire Rollers: Use treadless tires that are the

same size and ply rating, and inflated to a uniform pressur e not varying more than ±5 psi between tires. Equip tires with scrapers to prevent adhesion of mixture. The engineer may require additional cleaning and water apparatus on tires if material adhesion is detrimental to the mat.

503.16.4 Equipment for Asphalt Surfac e Treatments (AST).

503.16.4 1 Pneumatic Tire Rollers for AST: Use a minimum

of two self -propelled rollers, weighing at least 12 tons each. Tires shall be smooth tread, of the same size and ply rating. Inflate to a minimum uniform tire pressure of 60 psi, unless damage occurs. The engineer may require a reduction i n roller pressure to prevent damage to the aggregate or underlying base course. Wheels shall not wobble and shall be aligned so that the gaps between tires on one axle are covered by tires of the other axle.

503.16.4 2 Power Broom or Blower for AST: Use a power

revolving broom or power blower to clean the surface of dust, dirt, mud, and loose or excess material.

503.16.4 3 Aggregate Spreader for AST: Use a self -

propelled, pneumatic tire power spreader designed, equipped, and operated to spread aggregate uniformly at the designated rate within the limits of the desired roadway width. The aggregate spreader shall be capable of maintaining an allowable variation from the specified rate within ±0.5 pounds per square yard or ±0.25 pounds per square yard for expanded clay. Calibrate the aggregate spreader in accordance with ASTM D 5624.

503.16.4 4 Vacuum -Sweeper for AST: Provide a vacuum -

sweeper when there is a dusting problem, as determined by the project engineer.

503.17 Miscellaneous Equipm Ent and Hand Tools.

Provide power revolving br ooms or power blowers that are maintained and in satisfactory working condition. In areas that are inaccessible to conventional rollers, use satisfactory mechanical compaction equipment, or hot hand tampers. Tamping tools may be used for compacting edges. of two self -propelled rollers, weighing at least 12 tons each. Tires shall be smooth tread, of the same size and ply rating. Inflate to a minimum uniform tire pressure of 60 psi, unless damage occurs. The engineer may require a reduction i n roller pressure to prevent damage to the aggregate or underlying base course. Wheels shall not wobble and shall be aligned so that the gaps between tires on one axle are covered by tires of the other axle.

503.16.4 2 Power Broom or Blower for AST: Use a power

revolving broom or power blower to clean the surface of dust, dirt, mud, and loose or excess material.

503.16.4 3 Aggregate Spreader for AST: Use a self -

propelled, pneumatic tire power spreader designed, equipped, and operated to spread aggregate uniformly at the designated rate within the limits of the desired roadway width. The aggregate spreader shall be capable of maintaining an allowable variation from the specified rate within ±0.5 pounds per square yard or ±0.25 pounds per square yard for expanded clay. Calibrate the aggregate spreader in accordance with ASTM D 5624.

503.16.4 4 Vacuum -Sweeper for AST: Provide a vacuum -

sweeper when there is a dusting problem, as determined by the project engineer.

503.17 Miscellaneous Equipm Ent and Hand Tools.

Provide power revolving br ooms or power blowers that are maintained and in satisfactory working condition. In areas that are inaccessible to conventional rollers, use satisfactory mechanical compaction equipment, or hot hand tampers. Tamping tools may be used for compacting edges. of two self -propelled rollers, weighing at least 12 tons each. Tires shall be smooth tread, of the same size and ply rating. Inflate to a minimum uniform tire pressure of 60 psi, unless damage occurs. The engineer may require a reduction i n roller pressure to prevent damage to the aggregate or underlying base course. Wheels shall not wobble and shall be aligned so that the gaps between tires on one axle are covered by tires of the other axle.

503.16.4 2 Power Broom or Blower for AST: Use a power

revolving broom or power blower to clean the surface of dust, dirt, mud, and loose or excess material.

503.16.4 3 Aggregate Spreader for AST: Use a self -

propelled, pneumatic tire power spreader designed, equipped, and operated to spread aggregate uniformly at the designated rate within the limits of the desired roadway width. The aggregate spreader shall be capable of maintaining an allowable variation from the specified rate within ±0.5 pounds per square yard or ±0.25 pounds per square yard for expanded clay. Calibrate the aggregate spreader in accordance with ASTM D 5624.

503.16.4 4 Vacuum -Sweeper for AST: Provide a vacuum -

sweeper when there is a dusting problem, as determined by the project engineer.

503.17 Miscellaneous Equipm Ent and Hand Tools.

Provide power revolving br ooms or power blowers that are maintained and in satisfactory working condition. In areas that are inaccessible to conventional rollers, use satisfactory mechanical compaction equipment, or hot hand tampers. Tamping tools may be used for compacting edges. of two self -propelled rollers, weighing at least 12 tons each. Tires shall be smooth tread, of the same size and ply rating. Inflate to a minimum uniform tire pressure of 60 psi, unless damage occurs. The engineer may require a reduction i n roller pressure to prevent damage to the aggregate or underlying base course. Wheels shall not wobble and shall be aligned so that the gaps between tires on one axle are covered by tires of the other axle.

503.16.4 2 Power Broom or Blower for AST: Use a power

revolving broom or power blower to clean the surface of dust, dirt, mud, and loose or excess material.

503.16.4 3 Aggregate Spreader for AST: Use a self -

propelled, pneumatic tire power spreader designed, equipped, and operated to spread aggregate uniformly at the designated rate within the limits of the desired roadway width. The aggregate spreader shall be capable of maintaining an allowable variation from the specified rate within ±0.5 pounds per square yard or ±0.25 pounds per square yard for expanded clay. Calibrate the aggregate spreader in accordance with ASTM D 5624.

503.16.4 4 Vacuum -Sweeper for AST: Provide a vacuum -

sweeper when there is a dusting problem, as determined by the project engineer.

503.17 Miscellaneous Equipm Ent and Hand Tools.

Provide power revolving br ooms or power blowers that are maintained and in satisfactory working condition. In areas that are inaccessible to conventional rollers, use satisfactory mechanical compaction equipment, or hot hand tampers. Tamping tools may be used for compacting edges. of two self -propelled rollers, weighing at least 12 tons each. Tires shall be smooth tread, of the same size and ply rating. Inflate to a minimum uniform tire pressure of 60 psi, unless damage occurs. The engineer may require a reduction i n roller pressure to prevent damage to the aggregate or underlying base course. Wheels shall not wobble and shall be aligned so that the gaps between tires on one axle are covered by tires of the other axle.

503.16.4 2 Power Broom or Blower for AST: Use a power

revolving broom or power blower to clean the surface of dust, dirt, mud, and loose or excess material.

503.16.4 3 Aggregate Spreader for AST: Use a self -

propelled, pneumatic tire power spreader designed, equipped, and operated to spread aggregate uniformly at the designated rate within the limits of the desired roadway width. The aggregate spreader shall be capable of maintaining an allowable variation from the specified rate within ±0.5 pounds per square yard or ±0.25 pounds per square yard for expanded clay. Calibrate the aggregate spreader in accordance with ASTM D 5624.

503.16.4 4 Vacuum -Sweeper for AST: Provide a vacuum -

sweeper when there is a dusting problem, as determined by the project engineer.

503.17 Miscellaneous Equipm Ent and Hand Tools.

Provide power revolving br ooms or power blowers that are maintained and in satisfactory working condition. In areas that are inaccessible to conventional rollers, use satisfactory mechanical compaction equipment, or hot hand tampers. Tamping tools may be used for compacting edges. Section 504 Asphalt Tack Coat

504.01 DESCRIPTION. Prepare and treat existing asphalt or portland

cement concrete pavement surfaces with asphalt material in accordance with these specifications and in conformity with the lines and grades shown on the plans or established.

504.02 ASPHALT MATERIALS. Use an undi luted asphalt emulsion

Grade NTSS -1HM, CRS -2P, CSS -1H, SS -1H, SS -1L or PET as required by Section 501 , Section 502 , and Section 507 and as listed on the Approved Materials List and comply with Section 1002 .

504.03 WEATHER LIMITATIONS. Do not apply asphalt tack coat on a

wet surface or when the ambient air temperature is below 40°F. For full depth patching, do not place asphalt tack coat when ambient air temperature is below 35°F.

504.04 EQUIPMENT. Provide equipment for applying asphalt material

and pr epare the surface to be tacked. Apply with equipment conforming to

503.13.1 and 503.15.1 . A hand -held pressure nozzle may be used for tack

coat application in lieu of the spray bar/tachometer combination for irregular sections or short sections of 1500 feet or less.

504.05 SURFACE PREPARATION. Clean the pavement surface by

sweeping or other approved methods. Satisfactorily clean edges of existin g pavements that will form joints with new pavement before tack coat is applied.

504.06 APPLICATION. Uniformly apply asphalt tack coat to a clean

dry surface with no bare areas, streaks or puddles with an asphalt distributor at a rate in accordance with Table 504-1. If bleeding, ponding, or slipping are evident, these rates may be reduced to a minimum of 0.04 gallon/square yard with a minimum 0.02 gal/sq yd residual with approval of the engineer.