401Plant Mix Surfacing

401.01DESCRIPTION

This work is producing, furnishing, placing, and compacting plant mix asphalt pavement. Plant mix pavement is 1 or more courses of plant mixed aggregate, hydrated lime, chemical additive if used, and bituminous material, placed and compacted on a prepared foundation. Warm mix surfacing (warm mix) is plant mix surfacing which has been modified with additives or processes that allow a reduction in the temperature at which plant mix surfacing is produced, placed, and compacted.

401.02MATERIALS

Provide aggregate from sources meeting the Section 106 requirements. The Contractor is responsible for all sampling, quality control testing, and control of the aggregate. Furnish the Project Manager the quality control test results upon request. Ensure that the aggregate, when combined at the job mix formula (JMF), meets Table 701-15, and Subsection 701.03.1.

.1 Aggregate

Meet aggregate requirements in accordance with Subsection 701.03. For commercial and non-commercial mix, when no aggregate size is specified, use either ½-inch (12.5 mm) or ¾-inch (19 mm) nominal aggregate sizes. When ¾-inch non-commercial plant mix is specified, the Contractor may request to substitute ½-inch non-commercial plant mix for the ¾-inch non-commercial plant mix prior to submitting a mix design. The Department will execute a no cost change order replacing the ¾-inch plant mix item with the ½-inch plant mix item.

.2 Hydrated Lime

Furnish hydrated lime from a supplier listed on the Department’s QPL and in accordance with Subsection 713.02.

.3 Asphalt Cement

Furnish asphalt cement in accordance with Section 402. Asphalt cement modified with warm mix additives will be tested with the additives and must meet the contract requirements.

.4 Additives for Warm Mix

Comply with the warm mix technology manufacturer’s recommendations for incorporating additives and/or processes when producing warm mix. Comply with manufacturer’s recommendations regarding receiving, storage, and delivery of warm mix additives. Mix warm mix at a minimum temperature of 220 °F (104 °C) and within the range recommended by the manufacturer and approved by the Department. Use asphalt additives listed on the QPL to produce warm mix. Use foaming technology that is manufactured and marketed for the purpose of producing warm mix. Ensure a manufacturer’s technical representative is present during production and placement of warm mix for at least the first 10,000 tons (10,000 MT) of mix placed and as directed by the Project Manager for the remainder of the project. This requirement may be waived if successful experience in warm mix construction is demonstrated. – PLANT MIX SURFACING 2020 EDITION V5.1 In addition to the information specified in Subsection 401.03.1, provide the following information at least 30 calendar days before warm mix production:

for production, and documentation showing the impact of excessive production variation.

percentages proposed for use.

mix asphalt. Provide manufacturer’s sample preparation recommendations for warm mix design and testing; and

for incorporating warm mix additive into mix design samples and mixing and compaction temperature ranges.

.5 Binder Replacement

A portion of the asphalt binder may be obtained from either RAP and/or recycled asphalt shingles (RAS). Do not use RAS when producing warm mix. Inclusion of recycled materials will be evaluated by “percent binder replacement”, defined as the ratio of the recycled binder to the total binder. Meet the requirements of the Table 401-1. TABLE 401-1 MAXIMUM ALLOWABLE PERCENT BINDER REPLACEMENT Recycled Material Replacement Allowed Lower Layers Upper Layer (top 0.15-feet) RAS (used alone) 15 15 RAP 35 25 RAP and RAS (combination)1 25 25 Note 1: When using RAS in combination with RAP, ensure the RAS does not exceed 3% by weight of the total aggregate blend. If binder replacement is included in the job mix formula and the final mix, meet all of the plant mix requirements. Utilize separate stockpiles and feeds for each recycled component. It is recommended that at least 2 separate RAP stockpiles be produced. Furnish RAS in accordance with AASHTO MP 23. The specific gravity of the RAS may be obtained in accordance with AASHTO R 114. If RAS is used, meet the requirements of Table 401-2: 2020 EDITION V5.1 PLANT MIX SURFACING – 401 TABLE 401-2 TABLE OF GRADATIONS - RAS Percentage By Weight Passing Square Mesh Sieves Sieve Size Percent Passing ⅜-inch (9.5 mm) 100 No. 4 (4.75 mm) 93

.6 Emulsified Asphalt

Furnish an emulsified asphalt, when required, meeting the requirements of Section 702.

401.03CONSTRUCTION REQUIREMENTS

paving starts. The minimum required attendees are the superintendent, foreman, other contractor personnel that will supervise the paving operations, traffic control foreman, and key Department inspection personnel. The purpose of the meeting is to review specification requirements, lines of communication, discuss paving plan, quality control, aquatic resources, traffic control, safety, and sampling. Produce plant mix in accordance with Table 701-15, Table 701-16 Table 701-17, Table 701- 18 and form MDT-CON-401-03. Produce plant mix in a plant capable of accurately proportioning and uniformly mixing all ingredients. Do not begin plant mix production until receiving notification that the Department’s mix design verification is complete. For commercial mix, produce plant mix with actual asphalt cement content within +/- 0.3% of the mix design or field established job mix formula. For non-commercial mix, set the initial job mix targets before producing more than 2000 tons (2000 MT) of plant mix surfacing. Plant mix produced prior to setting initial targets is defined as start-up mix. Furnish the Project Manager 1 copy of form MDT-CON-401-03 with the proposed job mix targets for VMA, VFA, VTM, and D/A. Once the job mix targets are set, Quality Assurance (QA) will be applied to all subsequent plant mix produced. No pay incentive will be applied to the plant mix until the targets are set. Produce start-up mix meeting the criteria listed in accordance with the Start-Up Job Mix Range in Table 701-18. A Hamburg wheel track test

does not meet all the criteria specified in accordance with the start-up job mix range in Table 701-18. The Contractor may revise the job mix targets one time during the contract. Submit revised job mix targets no later than 2 business days following completion of plant mix production, or initial job mix targets will be used to determine payment. If more than one project is included in the contract (tied projects), the job mix targets may be revised for each project only if the projects use different mix designs. Submit form MDT-CON-401-03 with the revised job mix targets for VMA, VFA, VTM and D/A. The revised targets will be applied retroactively to all plant mix produced after the initial targets are set, and payment will be recalculated. No monetary, time or other compensation will be allowed for Department actions required due to the setting of initial targets, (e.g., P-value shutdowns, etc.).

.1 Mix Design

Submit an asphalt mix design following AASHTO R 35 and meeting AASHTO M 323, as modified in section 701. Use form MDT-MAT-009 as a mix design cover sheet. Ensure all fields are completed. The mix design and cover sheet may be submitted electronically. Mix designs – PLANT MIX SURFACING 2020 EDITION V5.1 submitted without the cover sheet or submitted with a cover sheet that doesn’t contain all the applicable information will be rejected. Include the asphalt binder supplier’s recommended mixing and compaction temperature ranges. This compaction temperature range is for testing purposes only. Choose the design air voids target to be the lowest value, within the range of 3.4 to 4.0, ensuring all other criteria are met. Report the dust-asphalt ratio (D/A) for the target asphalt content. The mix design is to be produced on a total weight of mix basis. On contracts with multiple gravel sources, or combination of gravel sources, provide a mix design and meet all the requirements for each source or combination of sources and suppliers. For mix designs using binder replacement, furnish the asphalt content and gradation of each recycled component and furnish the total asphalt content and Job Mix Formula gradation including the RAP/RAS. Furnish all specific gravities. Furnish samples of material from each stockpile. Ensure samples represent the stockpiles and mix design to be used on the project, including any recycled materials (RAP/RAS). Provide at least 800 pounds of aggregate, which can be appropriately proportioned to match the mix design and JMF according to MT 336. If the aggregate submitted cannot be appropriately proportioned to the submitted JMF, the mix design will be rejected, and the mix design verification process will start over. A total weight of 600 pounds (272 kg) is allowed if the mix design includes Hamburg testing results. Furnish 5 gallons (19 L) of the specified asphalt binder or indicate consent to use binder of the same source and grade provided from the Department’s supply. Furnish 5 pounds (2.27 kg) of hydrated lime or indicate consent to use lime of the same source provided from the Department’s supply. The Department has 30 calendar days from receipt of the mix design materials and signed mix design documents to review/verify the mix design. Mix design verification consists of: • Verifying less than 13.0 mm of rut at 15,000 passes during Hamburg testing. • A review of the submitted mix design documents to ensure all applicable design and aggregate requirements have been met; and, • Testing of the submitted aggregate for conformance with Subsection 701.03 . Hamburg test results may be submitted with the mix design. Ensure Hamburg testing is done in accordance with MT 334. The Department reserves the right to verify any Hamburg results. Use AASHTO T 283 to determine the mixture resistance to moisture induced damage, modified to compact the 6-inch (150 mm) diameter specimens to 3.75 inches ± 0.20-inch (95 mm ± 5 mm), at 7 ± 1.0% air voids. Meet a tensile strength ratio of 0.7 or greater. Tensile strength ratio test results do not have to be submitted with the signed mix design documents but must be received and reviewed before a mix design will be considered verified. If the Department does not complete its review/verification within 30 days, contract time will be extended for the actual contract time the Contractor’s paving start date was delayed, as verified by their most recent submitted schedule, and only for contract time assessed after the 30-day verification time frame. No additional compensation is allowed for these Department- caused delays. Contract time will not be extended if the delay occurs between November 1st and April 15th. A change in the asphalt supplier or aggregate source(s) will not require a new mix design, provided no change in the established job mix targets is requested, and the aggregate and Hamburg requirements are met. Furnish QC data for review and/or material samples for testing as requested by the Department. If a change in the asphalt supplier or aggregate source is requested after original mix design verification by the Department but before production begins, a new mix design is not required, however, targets must be set before laydown operations begin and all mix will be considered production mix. During start up, establish job mix targets 2020 EDITION V5.1 PLANT MIX SURFACING – 401 immediately if changing asphalt supplier or aggregate source prior to setting initial targets on non-commercial mix projects. For commercial mix, any mix produced after a change in supplier will be considered production mix and subject to full disincentives. Provide the apparent and bulk dry specific gravities and absorption for the aggregate, and the specific gravity for asphalt cement when there are changes in the source(s). In the event a stockpile from the original aggregate source is depleted during production and the stockpile is replenished by additional crushing from the original source, furnish aggregate QC data for review and submit aggregate samples as requested by the Department. If the crusher used for the additional aggregate must be mobilized to perform additional crushing, cease all paving operations until enough aggregate has been crushed to finish production. The Department reserves the right to require re-verification testing, or a new mix design based on a review of the submitted QC data and Department aggregate test results. Any paving after stockpile depletion and before the Department’s review is at the Contractor’s risk. In lieu of developing a new mix design, a previous Department verified mix design may be requested for transfer. To be eligible for transfer, a transferred mix design must: • utilize the same material properties. • the material properties must come from the same sources. • the material properties must be in the same proportions as the original mix design; and • the mix design must have been verified or re-verified within 3 years prior to the transfer request. Any request for transfer must be made at least 10 business days in advance of paving. Mix design transfers will not be considered if the design traffic warrants different mix design criteria. Approval for transferring a mix design is at the discretion of the Department and may require Hamburg testing or aggregate consensus properties re-verification. Proposed transfers with variations to the original mix design such as asphalt supplier, binder grade, or other factors such as changes to the crushing operation which could create uncertainty in the performance of the mix design will be subject to re-verification testing. When submitting a request for a mix design transfer, furnish quantities from each stockpile to produce a 300-pound (136 kg) sample if the Department determines Hamburg or aggregate consensus properties re-verification is necessary. Submit form MDT-MAT-009 with any mix transfer request.

.2 Hamburg Wheel Track (Hamburg) Testing and Acceptance

a sample of plant mix surfacing material for Hamburg acceptance after initial job mix targets have been established for non-commercial mix and as directed for commercial mix. Furnish additional samples as directed by the Project Manager. The Department may require Hamburg samples at any time. Hamburg samples may be run on the applicable gyratory pucks and/or in-place mix represented by the pucks. At the time of initial target set the Department will perform Hamburg testing on the applicable gyratory pucks first as a screening tool. If Hamburg results from the gyratory pucks meet the specifications the material is considered acceptable, and paving may continue. If Hamburg results from the gyratory pucks do not meet specifications, the Department will perform Hamburg testing on representative in-place mix using 6-inch or 10-inch cores. If Hamburg results from the representative cores meet specifications the material is considered acceptable and paving operations may continue. If Hamburg results from the representative cores do not meet specifications the material is considered unacceptable – PLANT MIX SURFACING 2020 EDITION V5.1 and will be evaluated according to 401.03.2(B). Hamburg test results for the initial target set will be furnished to the Contractor within 7 business days. Hamburg test results in all other cases will be furnished to the Contractor as soon as they are available.

10,000 passes during production Hamburg testing. Plant mix that exceeds 13.0 mm of rut within 10,000 passes is considered failing material. Remove and replace failing material, as directed, at Contractor expense. The Department may take additional Hamburg samples to determine the extent of the failure and the amount of material to be removed and replaced. Adjust operations to produce plant mix meeting specifications after a failing Hamburg test and produce no more than 300 tons (300 MT) of plant mix until passing Hamburg results are achieved. When 2 consecutive Hamburg samples do not meet specifications suspend production and submit a revised mix design and samples for verification and Hamburg testing. The initial mix design requirements will be used for verification. Do not resume production until the revised mix design is verified and Hamburg mix design requirements are met. Plant mix lots represented by samples that do not meet Hamburg specifications are not eligible for QA incentives including ride and density incentives. At the Department’s discretion, failing material may be left in place at a reduced price according to the criteria listed below. In these situations, the Department will evaluate and consider volumetric and density test results as well as applicable pavement design criteria to determine an acceptable course of action.

represented by a failing Hamburg test.

number of wheel passes when the rut depth reaches 13.0 mm will be used to determine the reduced price pay factor. The pay factor for the material represented by each test is determined from Table 401-3.

mm of rut between 6000 and 8000 passes may remain in place at a 0.5 pay factor: • Roadway shoulders, if the entire width of the paver pass occurred within the width of the shoulder. • Plant mix layers below 0.25 feet from the finished surface of plant mix.

passes.

Hamburg testing. 2020 EDITION V5.1 PLANT MIX SURFACING – 401 TABLE 401-3 HAMBURG TESTING PAY FACTORS PG 58-XX and 64-XX # of wheel passes Pay factor x ≥ 10,000 PF = 1.0 10,000 > x ≥ 8,000 𝑃𝑃𝑃𝑃 = 1.00 − 0.50(10000 − 𝑥𝑥) 2000 x < 8,000 PF = 0, Remove and Replace Table 401-3 is not applicable if the entire plan thickness section of plant mix is not completed prior to winter suspension.

.3 Test Procedures

Plant mix will be evaluated in accordance with the following test procedures: MT 303 - Sampling Bituminous Materials AASHTO T 166 - Method of Test for Bulk Specific Gravity of Compacted Bituminous Mixtures MT 319 - Ignition Oven Burn Procedure MT 320 - Gradation of Aggregate Recovered by MT 319 MT 321 - Maximum Specific Gravity of Bituminous Mixtures (Rice Method) MT 328 - Method of Establishing Field Target Density for Plant Mix Surfacing Density Control MT 332 - Gyratory Compaction of Bituminous Mixtures MT 334 - Wheel Tracking Test Procedure (Hamburg Device) MT 336 – Method of Batching Asphalt Aggregate for Mix Design Verification When material is tested in accordance with MT 332, if the height of gyratory specimens is out of tolerance, an evaluation will be conducted to determine if the specimen will be retained or discarded. The Department will check plant production information, test equipment, processes, calculations, etc. for issues. If a problem is noted in processes controlled by the Contractor, the test will be considered valid. If a problem is found with the testing or other Department process, or no issues with Contractor production are identified, the test will be redone on material from the same sample, if possible. If a non-correctable testing problem is found, the specimen will be discarded.

.4 Composition of Mixtures

applicable), and aggregate gradation. Base the target asphalt cement content on design and field gyratory mix test results. Mix design specific gravities will be used during plant mix production unless otherwise directed by the Project Manager. Include 1.4% hydrated lime by total weight of mix as part of the aggregate gradation.

as directed by the Project Manager. The Project Manager will randomly select when plant mix samples are taken. Sample in accordance with MT 303. A Department Inspector will witness plant mix sampling. Furnish the sample to the Inspector immediately after it is – PLANT MIX SURFACING 2020 EDITION V5.1 taken or, upon Project Manager directive, deliver the sample to the Department’s designated test location after the Inspector seals the sample in a tamper proof container. Plant mix sampling will begin as soon as plant mix is delivered to the project.

.5 Acceptance Commercial Plant Mix Surfacing

The asphalt content used for calculations is determined in accordance with MT 319. The D/A is calculated in accordance with MT 319, and the gradation determined in accordance with MT 320 o n the aggregate remaining after the ignition oven test. For the first 1000 tons (1000 MT), a $3.00/ton maximum price reduction in the unit bid price for plant mix surfacing will be applied for any mix represented by a test not meeting the VMA, VFA, VTM, or D/A specified. A $3.00/ton price reduction ($9.00/ton maximum) in the unit bid price for plant mix surfacing will be applied to any subsequent mix for each test not meeting the VMA, VFA, VTM, or D/A specified. Price reductions will be assessed on the quantity of material represented by each failing sample. The quantity of material represented by each sample is the total tons of material produced divided by the total number of samples representing the material. A minimum of 1 volumetric sample will be taken on permanent crossovers and projects with a plan quantity of 500 tons (500 MT) or more and samples will be tested at a minimum rate of one per 2,000 tons (2,000 MT). Compact according to Subsection 401.03.21 . Commercial plant mix will not be tested for volumetrics where the volume is less than 500 tons (500 MT). Acceptance in these areas will be based on conformance with the established mix design proportions or agreed upon adjustments. Compact these areas to at least 93.0% of the Rice Gravity with the following exception: • 92.0% - any mix placed directly on a crushed aggregate surfacing. Compaction verification testing will be performed as determined necessary by the Project Manager.

.6 Acceptance of Non-Commercial Plant Mix Surfacing (QA)

For the start-up mix, a $3.00/ton price reduction ($9.00/ton maximum) in the unit bid price for plant mix surfacing will be applied for each test not meeting the VMA, VFA, VTM, or D/A specified. Price reductions will be assessed on the quantity of material represented by each failing sample. The quantity of material represented by each sample is the total tons of start-up mix produced divided by the total number of samples representing the material. Once targets have been set, the properties listed in Table 701-18 for non-commercial plant mix are designated for acceptance on a lot-by-lot basis in accordance with Subsection 105.03.2. The pay factor in Table 401-4 is applied to plant mix surfacing lots for VMA, VFA, VTM and D/A. The asphalt content used for calculations is determined in accordance with MT 319. The D/A is calculated in accordance with MT 319, and the gradation determined in accordance with MT 320 on the aggregate remaining after the ignition oven test. The approximate mix quantity represented by each sub-lot is 1,000 tons (1,000 MT). The quantity represented by 5 tests or approximately 5,000 tons (5,000 MT) of mix constitutes a lot whenever production schedules and material continuity permit. A lot represented by 3 to 7 consecutive random sub-lots will be established when there are short production runs, significant material changes, or other unusual characteristics of the work. All other contract items are evaluated for acceptance in accordance with the applicable specifications covering those items. Each element of a lot will be evaluated for pay adjustments. 2020 EDITION V5.1 PLANT MIX SURFACING – 401 All the individual test results in the lot for the element to be evaluated will be averaged, and the percent of price reduction for the lot determined by the applicable formula. F is the price reduction factor to be applied for each element as shown in Table 105-2 and Table 401-4. TABLE 401-4 TABLE OF PAY FACTORS Incentive Item “F” Factor Maximum Pay Factor VMA 6 1.02 VFA 2 1.02 VTM 6 1.02 D/A 30 1.02 When adjustments are being made for one of the two reasons in accordance with Subsection

105.03.2, the Department may require additional samples to test the material being produced, in

addition to the planned random samples. These additional tests will be used to determine if the adjustments are effective and whether production may continue. These tests will be used to identify obviously defective sections.

.7 Quality Incentive Allowance

For each element with a P value of less than 3, the incentive is calculated by subtracting the calculated P value from 3 to determine the pay factor. The maximum pay factor for each element is 2%. An additional 4% incentive will be applied to the lot payment if the sum of the pay factors for the individual elements for a lot is 6% or greater. The maximum pay factor for a lot is 12%.

.8 Equipment

Adapt the mixing plant as required by the manufacturer to introduce warm mix technology. Plant adaptations may include additional plant instrumentation, the installation of asphalt cement foaming systems and/ warm mix additive delivery systems, tuning the plant burner and adjusting the flights in order to operate at lower production temperatures and/or reduced tonnage.

materials. Ensure the weigh accuracy is within plus or minus 0.5% of the true weight throughout the use range. Include in the system an automatic printer that provides the following information:

– PLANT MIX SURFACING 2020 EDITION V5.1

Use a pre-programmed printer or one equipped to prevent manual override of any weight information. Have the weigh system tested, certified, and sealed by the State Bureau of Weights and Measures after each plant move and before production for a project. Immediately stop production should the printer malfunction or breakdown and do not resume until corrected. Delivery of material from storage or surge bins will be permitted only if the weight can be maintained within weigh specifications. If an independent certified scale is within a 20 mile (32 km) round trip distance from either end of the project, the Project Manager will randomly re-weigh loaded vehicles at least 3 times per project. Re-test the plant weigh system any time the difference between the re-check and the plant system exceeds ± ½ of 1% of the load. Any weight difference will be addressed in accordance with Subsection 109.01.1.

of using an automatic weigh system. Ensure manual weighing includes platform scales in accordance with Subsection 301.03.2(C) , a competent weigh person, and dump person. Direct the weigh person to record, on Department furnished forms, weights to the nearest 100 pounds (45.4 kg) as well as the other required information regarding delivery and placement. Certify that weights and totals furnished are a true and correct record of materials delivered and placed in the work. Submit the records and totals before 10:00 a.m. the next work day following the shift.

.9 Safety Requirements

Install and maintain stairs, ladders, walkways, and all other plant facilities meeting State and Federal safety requirements. Provide access to the plant mix within the trucks for taking samples and mix temperature data.

.10 Burner Fuel Restrictions

Use one of the approved fuels below to heat and dry aggregates. • Propane • Butane • Natural gas • Fuel oil (grades 1, 2, and 5 only) • Coal EPA Specification-used oil fuel (EPA-UOF) may be used instead of the approved burner fuels provided Table 401-5 requirements are met. 2020 EDITION V5.1 PLANT MIX SURFACING – 401 TABLE 401-5 EPA SPECIFICATION - USED OIL FUEL REQUIREMENTS Physical Properties Property Range API Gravity 20-28 Viscosity at 122 °F (60 °C) (Saybolt Flurol) 10-20 Pour point +10 °F (−12 °C) Flash point, minimum 100 °F (37.8 °C) Water by distillation Under 1% Solids by separation Under 1% Ash Under 0.4% Sulfur Average 0.5% Kinematic viscosity at 100 °F (37.8 °C) 54-100 (centistokes) Kinematic viscosity at 122 °F (60 °C) 15-75 (centistokes) Chemical Properties Element or Compound Permitted Level Vanadium Under 100 ppm (100 mg/L) Cadmium Under 2 ppm (2 mg/L) Chromium Under 10 ppm (10 mg/L) Lead Under 100 ppm (100 mg/L) Arsenic Under 5 ppm (5 mg/L) Total halogens Under 1,000 ppm (1,000 mg/L) PCB’s Under 2 ppm (2 mg/L) Furnish a copy of certified test results from the supplier for each load of EPA-UOF delivered to the project. Furnish plant manufacturer information showing the plant burner is designed and equipped to burn EPA-UOF or grade 5 fuel oil. Upon request, provide a 1-quart (1 L) sample of EPA-UOF from the tank on the project. Immediately stop using EPA-UOF or grade 5 fuel oil if burner flame outs or other evidence of incomplete combustion or mix contamination is evident. Begin using one of the other approved fuels to complete the work. Remove and replace all contaminated plant mix at Contractor expense. No additional compensation will be allowed.

.11 Dry Warm Mix Additive, Hydrated Lime Feed System

Introduce dry hydrated lime into drum dryer mixing plants just below the asphalt cement introduction point. Introduce dry warm mix additive as directed by manufacturer. Ensure the system provides positive, accurate material feed and is automatically synchronized to the aggregate feed. Ensure the system indicates the weight entering the mixing unit on a time-coordinated basis. Weigh using an automatic indicating electronic system. The lime may be weighed directly, or the storage container including lime may be weighed. – PLANT MIX SURFACING 2020 EDITION V5.1 Provide a continuous digital readout showing the weight or rate of feed in tons (MT) per hour. Record the information using a production monitor/recorder system or by a de-cumulating balance ticket-printing system. Record the information at minimum 5-minute intervals or as directed. Silo or storage container system weights are not used for acceptance during filling or transfer. Limit filling or transfer periods to one hour per three hours of plant operation. Record and furnish start and finish times for filling or transfer and the total quantity added. Suspend mixing for erratic feeding or failure to feed hydrated lime to a minimum of 85% of the job mix formula. Do not resume until corrected or repaired.

.12 Flow Rate Meter

Measure the asphalt cement and liquid warm mix additive (if applicable) discharged into the mixing unit using a flow rate meter with totalizer and temperature compensation. Ensure the totalizer records up to 1,000,000 gallons (3,785,000 L) and is certified to ± 0.2% of the measured quantity. Use a flow rate meter and totalizer that automatically corrects to a temperature of 60 °F (16 °C) with an operating range of +60 to +450 °F (16 to 232 °C). Locate the totalizer readout in the plant control room so it is readily accessible to the Inspector. Ensure the flow rate meter automatically shuts off any time asphalt cement is diverted or stops entering the mixing unit. Calibrate the flow rate meter and totalizer before the start of the project and as necessary during production. The Project Manager will witness the calibration. Provide the equipment and assistance for initial and subsequent calibration checks and furnish the Project Manager a copy of all calibration checks. Use a calibration volume of at least 3,000 gallons (11,355 L). Ensure the weigh scales have been tested and certified. Furnish the Project Manager 1 copy of a test report showing the asphalt cement specific gravity. Spot check failure will require re-testing and certification of the above. The Project Manager will establish the spot check interval.

.13 Production Monitor Recorder

Use recording equipment that automatically monitors and records, on a time coordinated basis, the aggregate, lime, warm mix additive and asphalt cement weight entering the mixing unit. The records may be continuous (chart recorder) or digital printout. Ensure that chart recorders clearly record asphalt cement content changes of 0.1% or more and aggregate feed rate changes of 1.5% or more. Ensure the digital printout equipment records the day’s total production at minimum 5-minute intervals, or the interval directed by the Project Manager. Digitally display the aggregate, warm mix additives, and asphalt cement rates in tons (MT) per hour and daily totals. Display lime by tons (MT) per hour or on a de-cumulating balance. Ensure the monitor system operates on unprocessed signals from measuring devices. Provide the Project Manager with continuous access to the recorder during production. Submit the permanent record daily. 2020 EDITION V5.1 PLANT MIX SURFACING – 401 Operate the production/monitor recorder at all times during production. Stop production when the recorder is not operational.

.14 Plant Mix Preparation

Mix the aggregate, all additives and asphalt cement to produce a homogeneous mixture. Ensure all aggregates are thoroughly and uniformly coated with bitumen. Immediately suspend operations if aggregate is not being completely dried prior to mixing. Remove, dispose of, and replace all mix that is damaged by burning, improper mixing, or fails to meet the specifications at Contractor expense. Maintain the mix discharge temperature within the asphalt cement manufacturer’s recommended mix temperature range does not exceed 355 °F (179 °C). The discharge temperature will be periodically checked and recorded. Remove and replace any mix produced when the mix discharge temperature exceeds the maximum temperature at Contractor expense.

.15 Roadway Equipment

material to the specified profile and cross slope. Immediately stop paving if the paver tears, shoves, segregates, or otherwise damages the plant mix, and repair or replace the paver before resuming paving operations. Equip the paver with a mobile grade reference system that provides a uniform pavement profile. Ensure the paver maintains the transverse slope at all times and is able to adjust the slope throughout super-elevated curves. Ensure auger extensions are used to match the screed width. Equip the paver with an attachment that produces joints in accordance with Subsection 401.03.19 as the plant mix is placed.

canvas or other approved material to protect the mix at Contractor expense.

Remove rollers that crush the paving aggregates or otherwise damage the plant mix and replace the damaged plant mix at Contractor expense.

any paving equipment or operations. Use a commercially manufactured release agent approved by the Project Manager.

.16 Existing Surface Preparation

Dispose of existing bituminous surface, designated to be removed, in accordance with Subsection 202.03.3 . Re-work all existing bituminous surfaces designated to remain in place as specified. Before placing the leveling course, clean the existing surface of dirt and loose, extraneous material. Apply a prime or tack coat of bituminous material to the cleaned surface as specified. Correct dips, depressions, sags, excessive or nonexistent crown, and other surface irregularities using a premixed bituminous mixture. Spread the mixture in 2-inch (50 mm) compacted layers. Correct surface irregularities exceeding 6 inches (150 mm) deep, using untreated aggregate material before leveling with a bituminous mixture. – PLANT MIX SURFACING 2020 EDITION V5.1

.17 Tack Coat

Apply tack coat in accordance with Section 402, 407 and the contract. Apply tack coat on aggregate treated surfaces, existing surfacing to be overlaid and between lifts when pavement is constructed in multiple lifts.

.18 Surface Conditions, Weather Limitations and Paving Dates

Stop plant mix paving when the surface temperature is less than 35 °F (2 °C); the surface is wet; the roadbed is unstable or the Project Manager determines adverse weather conditions prevent the proper handling, finishing, or compacting of the mix. Complete all sections of plant mix surfacing, to be open to traffic during winter suspension, to the full plan width and thickness, excluding the seal and cover. Complete this work meeting the specifications before the November 1 st paving cessation date. The Project Manager will suspend time assessment between November 1st and November 16th when the next scheduled significant work item is paving and all grading, gravel and other operations affecting the safe and convenient use of the roadway by the traveling public are complete. Submit a written request and obtain written approval in order to pave after November 1 st. and before April 15th. Plant mix surfacing placed after November 1st and before April 15th is at the Contractor’s risk and subject to the following conditions: • The surface temperature to be paved is at least 35 °F (2 °C), measured by the Project Manager. • All applicable specifications are met. Make permanent repairs and restore partially completed pavement to the required profile, section, and condition at Contractor expense before placing the remaining lifts. This is not a waiver by the Department of any other contract requirement regarding the work sequence or traffic operation. If the paving operation causes transverse joints spaced at less than ½-mile (805 m), suspend work until the next April 15 th. No payment is made for the plant mix or asphalt cement on progress estimates between November 1st and April 15th for partial width or thickness. Promptly repair damage to all partial width or thickness of plant mix surfacing used by traffic during this period for any reason including suspension of work due to adverse weather. Provide all required interim traffic striping and traffic control on partially completed pavement at Contractor expense. Failure to promptly make repairs and provide interim striping and traffic control is cause for the Department to perform or have the work performed and deduct the cost from monies due or that may become due the Contractor. Payment for partial width or thickness pavement in acceptable condition will be made on the estimates following the end of the period on the next April 15 th.

.19 Spreading and Finishing

Place and spread the mix in accordance with Table 401-6. Thinner lift thicknesses must be approved by the Project Manager. 2020 EDITION V5.1 PLANT MIX SURFACING – 401 TABLE 401-6 MINIMUM LIFT THICKNESS Aggregate Size Minimum Lift Thickness ⅜-inch (9.5 mm) 0.1-foot (30 mm) ½-inch (12.5 mm) 0.12-foot (36 mm) ¾-inch (19 mm) 0.15-foot (45 mm) Place and spread the mix to the widest practical width on the approved surface. Place shoulder-widening material with approved equipment. Establish and maintain line control for paving. The Project Manager will furnish the Contractor the necessary information to establish these controls. Maintain the paving control line tolerance within 0.25-foot (75 mm) of a true line from the existing reference points. Failure to maintain the paver control line within the specified tolerance is cause for corrective action or pavement removal and replacement, as directed by the Project Manager, at Contractor expense. Include the cost of furnishing horizontal line control in the plant mix surfacing bid item. Remove and replace segregated pavement areas behind the paver with new plant mix before initial rolling begins. Correct all segregated areas at Contractor expense. On small or irregular areas, approaches, turnouts, around manholes, inlets, walls and on other areas not readily accessible to a paver, plant mix may be spread to the specified thickness using a specialty paver or other approved methods. Compact these areas as directed. Remove and replace all plant mix that is segregated, loose, broken, contaminated, damaged, or otherwise defective, with new plant mix that meets contract requirements at Contractor expense. Remove any plant mix dropped from equipment onto any existing or new plant mix surfacing as directed by the Project Manager. Roadways having a design ESAL of 100 or less may be opened to traffic or to haul units subject to the Project Manager’s approval. Roadways having a design ESAL of 100 or greater may be opened to traffic and haul units when the mat is compacted and the surface cools to 140 °F (60 °C).

.20 Constructing Joints

Continuously place each lift and provide at least a 6-inch (150 mm) offset between longitudinal joints in successive lifts. Offset transverse joints in successive lifts by at least 6 feet (1.8 m). Correct joints that do not meet the surface tolerance requirements in accordance with Subsection 401.03.23 Uniformly coat the exposed face of all joints, excluding those formed by echelon paving, with a double shot of emulsified asphalt before placing the abutting course. Construct longitudinal joints in the top lift of plant mix at the centerline or lane line. If these locations are not practical, construct the joint outside the wheel paths as approved by the Project Manager. Construct a vertical transverse joint the full lift depth if the mix cools below the low temperature in accordance with Subsection 401.03.21 . Remove loose material, brush the joint face with asphalt, and compact the fresh mix against the joint face when paving is resumed. – PLANT MIX SURFACING 2020 EDITION V5.1 Taper the end of paving lifts at bridge ends and on roadways under traffic to a minimum 50H:1V ratio. When paving of the lift resumes, remove the taper and construct the transverse joint. Ensure transverse joints in lifts of plant mix surfacing or other lifts to be used by traffic for 15 calendar days or more do not vary more than ⅜-inch (9.5 mm) from any point on a taut 25-foot (7.6 m) string line placed parallel to centerline. Taper the longitudinal paving joint edges at a 4H:1V to 6H:1V slope. Compact the joint between abutting passes to the specified plant mix density. Do not permit an exposed longitudinal joint length to exceed one day’s paving run. Sign the new pavement end at the close of work each day meeting the project’s traffic control plan and the contract. Construct the joints at bridge ends or other rigid structures after the existing base is prepared and compacted. Apply a coat of emulsified asphalt to the portions of structures abutting the plant mix surfacing.

.21 Compaction, Compaction Control Testing, and Density Acceptance Testing

Complete compaction rolling within the temperature range recommended by the asphalt cement manufacturer included in the mix design or before the mat temperature falls below 175°F (80 °C). Compaction rolling after the temperature is below 175 °F (80 °C) is cause to suspend paving operations. Compaction rolling is rolling in the vibratory mode. The Project Manager may adjust the minimum 175 °F (80 °C) temperature if compaction rolling damages the new pavement or the contractor has received written approval from the asphalt cement manufacturer. Compact Warm Mixes in accordance with Subsection 401.02.4 . Perform all necessary density testing to control compaction. Compact plant mix with mechanical tampers, vibrating plates, or other means along curbs, abutments, retaining structures, up to and beneath the face of guardrail and posts, and other areas which are not accessible to compaction with rollers. Density acceptance by cores does not apply to leveling or isolation lifts that have a depth of less than 0.10-foot (30 mm) thick. The pavement density is determined from cores taken at randomly selected locations after all rolling is complete and before the roadway is open to traffic. Provide two 4-inch (100 mm) cores the full depth of the plant mix surfacing, extracted from within a 5-inch (125 mm) radius of each designated location. Mark the core as directed. Separate the plant mix lift to be tested from the total core. Cut the core to the actual lift thickness within ± 0.15-inch (4 mm). The Department recommends using a saw to separate the lift to be tested from the total core. Perform this work within the project limits or other approved location. The Inspector will witness all the above activities before traffic is permitted to use the plant mix lift being tested. Furnish the core immediately to the Inspector after it is removed, marked, and separated. Do not remove the cores from the Inspector’s visual control at any time. Remove free water from each core hole. Place and compact new hot plant mix, not exceeding 2-inch (50 mm) lifts, to the finished surface immediately after the core is removed. If approved by the Project Manager, fill with a commercially manufactured quick setting non-shrink grout to the finished surface. Apply a double shot of emulsified asphalt over the core holes when the patch material has set. Mark each core as directed by the Inspector witnessing the coring. 2020 EDITION V5.1 PLANT MIX SURFACING – 401 All costs of furnishing the cores will be considered incidental to the plant mix surfacing item and no separate measurement or payment will be made. Plant mix surfacing is evaluated for density on a lot-by-lot basis in accordance with Subsection 105.03.2.

specific gravity). The bulk specific gravity (AASHTOT 166) determined for each core will be divided by the target Rice gravity in effect at the time the plant mix was produced to determine the relative in-place density. The average of the results of the pair of cores from each location will be expressed as the percent of relative density. All results will be reported to the tenth of one percent (0.1%). Once the plant mix is spread, struck off, and surface irregularities are corrected, compact the plant mix to at least 93.0% of target maximum specific gravity with the following exceptions: • 92.0% - ⅜-inch (9.5 mm) mixes with plan depths of less than 0.12-foot (36 mm). • 92.0% - any mix placed directly on a crushed aggregate surfacing. Compact plant mix placed directly on CTB to 93.0% of target maximum specific gravity for the full width of the typical section including crushed aggregate shoulders. Provide core samples of the compacted plant mix from the roadway. Core locations will be randomly selected based on the tons (MT) of mix placed. Core the locations selected after all rolling is complete and before the roadway is opened to traffic. The center of the core location will not be within 12 inches (305 mm) of unconfined longitudinal paving joints, 12 inches (305 mm) of a shoulder hinge point, or where the planned nominal thickness is less than 0.10-foot (30 mm). The center of the core locations for vertically confined longitudinal joints may be placed within 5 inches (125 mm) of the joint. Re-core as directed any time either the contract requirements or procedures within this section are not met. The test results of the replacement core to be used in the QA evaluation for the lot represented will be the actual relative in-place density unless it exceeds: • 92%; then 92% will be used for the relative in-place density of that core in the QA evaluation. • 91% for ⅜-inch (9.5mm) mixes with plan depths of less than 0.12 foot (36 mm); then 91% will be used for the relative in-place density of that core in the QA evaluation. • 91% for any mix placed directly on a crushed aggregate surfacing; and then 91% will be used for the relative in-place density of that core in the QA evaluation. The plant mix in the sub lot represented is considered to be not meeting density specifications.

MT). Additional locations and tests may be required. The quantity represented by 5 tests or approximately 3,000 tons (3,000 MT) of mix constitutes a lot whenever production schedules and material continuity permit. – PLANT MIX SURFACING 2020 EDITION V5.1 A lot represented by 3 to 7 consecutive random sub-lots will be established when there are short production runs, significant material changes, or other unusual characteristics of the work.

new plant mix with either a notched wedge joint or taper the joint edges at a 4H:1V to 6H:1V slope. Confined joints created when paving against a vertically milled surface are excluded from the requirements of this specification. If using a notched wedge, ensure the notched wedge joint has a vertical edge of at least the maximum aggregate size and no more than ½ of the compacted lift thickness and then taper down on a slope not steeper than 4H:1V. Uniformly compact the sloped portion of the plant mix notched wedge joint. Use a device attached to the screed for shaping and compacting. When placing the second pass (hot lane), overlap the paver screed 1.0 ± 0.5 inches (25mm ± 13mm) onto the cold plant mix. Do not “bump back” or rake the overlapped material. Density acceptance by cores for longitudinal joints does not apply to first lifts of plant mix surfacing placed directly over crushed aggregate courses.

specific gravity (AASHTO T 166) determined for each core will be divided by the target Rice density in effect at the time the hot lane mix was produced to determine the relative in-place density. In the event the rolling Rice density differs by 0.5 lbs./ft between the hot and cold lanes, the Rice densities for that location will be averaged. All results will be reported to the tenth of one percent (0.1%). Compact the joint area to at least 91.0% of target maximum specific gravity as determined in accordance with MT 328 with the following exceptions: • 90.0% - ⅜-inch (9.5 mm) mixes with plan depths of less than 0.12-foot (36 mm). The joint area is defined as the tapered area at the overlap of the hot and cold lanes. Furnish the Department with a 4-inch or 6-inch core of the compacted joint for every 4000 feet (1219 m) of joint constructed, and at least 3 per project, at locations directed by the Project Manager. Center the core within the tapered area to include both the hot lane and cold lane. Mark the core as directed. Re-core as directed any time either the Contractor requirements or procedures within this section are not met. The test results of the replacement core to be used in the QA evaluation for the lot represented will be the actual relative in-place density unless it exceeds: • 90%; then 90% will be used for the relative in-place density of that core in the QA evaluation. • 89% for ⅜-inch (9.5mm) mixes with plan depths of less than 0.12 foot (36 mm); then 89% will be used for the relative in-place density of that core in the QA evaluation.

Additional locations and tests may be required. The quantity represented by 5 tests or approximately 20,000 feet of longitudinal joint constitutes a lot whenever production schedules and material continuity permit. A lot represented by 3 to 7 consecutive 2020 EDITION V5.1 PLANT MIX SURFACING – 401 random sub-lots will be established when there are short production runs, significant material changes, or other unusual characteristics of the work.

a lot-by-lot basis in accordance with Subsection 105.03.2. The pay adjustment will be calculated using the equation below. The unit cost will be $4.50/foot of joint. Length is the length of longitudinal joint in the lot. Pay Adjustment = (P/100) x Length x Unit Cost A 0.05 pay factor will be applied to the lots of longitudinal joints when the average density for the lot (Xn) is from 92.0% to 95.0%, inclusive of the Maximum Specific Gravity (Rice’s Method) and the range (R) is 3 or less. Longitudinal joint incentive is paid separately and is not included in the plant mix incentive adjustments. Include all costs associated with constructing the joint in the cost of plant mix surfacing.

.22 Pavement Repair

Cut out the defective pavement section to at least 0.15-foot (45 mm) depth or as directed by the Project Manager. Clean the sides and bottom of the repair area and apply tack coat to the surfaces. Fill the repair area with contract specified mix, level, and compact to the specified density and surface smoothness.

.23 Surface Tolerance for Flexible Pavement

pavements that meet surface smoothness and profile levels derived from the pre-pave IRI. Surface smoothness and surface profile will be analyzed from data collected by the Department using an Inertial Profiler System meeting AASHTO M 328 requirements and following Department procedures for profiler operations. The IRI will be measured in inches/mile, regardless of the unit of measure used on the contract. Projects with high pre-paving IRI value: • Projects with an average pre-paving IRI value greater than or equal to 190 in/mi and 2 or more opportunities to improve the ride are considered a Category I project. • Projects with an average pre-paving IRI value greater than or equal to 190 in/mi and one opportunity to improve the ride must have a post-paving IRI less than or equal to 50% of the pre-paving IRI. There is no pay adjustment factor based on smoothness; corrective action is required to produce a post-paving IRI less than or equal to 50% of the pre-paving IRI at Contractor expense. Each opportunity to improve the ride is one of the following: • Placing a gravel base or surfacing course. • Placing plant mix base. • Placing cement treated base. • Placing pulverized plant mix surfacing. • Milling. • Hot or cold recycling (milling and laydown); or • Each full 0.10-foot (30 mm) increment for ⅜-inch (9.5 mm) aggregate mix, 0.12 foot (36 mm) increment for ½-inch (12.5 mm) aggregate mix, and – PLANT MIX SURFACING 2020 EDITION V5.1 0.15-foot (45 mm) increment for ¾-inch (19 mm) aggregate mix of new plant mix surfacing. Target IRI values are determined by project category based on the opportunities for improving the ride, by the pre-paving IRI value, paving constraints or by a combination of these as follows:

Target IRI values - 45 to 55 inches per mile • Projects with 2 or more opportunities for improving the ride. • Projects with 1 opportunity for improving the ride with a pre-paving IRI value less than 110 in/mi.

Target IRI values - 55 to 60 inches per mile • Projects with 1 opportunity for improving the ride with a pre-paving IRI greater than or equal to 110 in/mi and less than 190 in/mi.

Target IRI values - 55 to 70 inches per mile • Urban projects with a posted speed limit of 55 MPH or less and curb and gutter controlling 1 or more edges of the paving. Leveling and isolation lifts are not included as an opportunity to improve the ride. The Department will test surface smoothness and surface profile before the placement of seal and cover or plant mix seal on the final lift of plant mix surfacing pavement. Testing will consist of 2 passes in each travel lane. For each pass, data collected for each wheel path will be averaged for that lane. The results of the two passes will then be averaged to arrive at a result for that lane. Tests will be performed within 10 business days (extended by rain or other inclement weather conditions) of completion of all mainline paving. The Department will test divided highways within 10 business days (extended by rain or other inclement weather conditions) of completion of mainline paving for each direction of travel. Ensure that the entire finished lane width to be tested is not impeded and is available to Department personnel at the time of testing. Test results will be furnished within 2 business days. If the entire final lift of pavement cannot be completed before winter suspension, data will be collected for all roadway sections paved through the final lift. Evaluation of the remaining pavement will be performed once the paving is completed. The surface smoothness analysis will be used to determine the actual IRI for calculating pay factors for the surfacing section. Actual IRI values will be determined on all mainline travel lanes, climbing lanes, passing lanes, and ramps that have 1000 feet (0.30 km) of (cumulative) ridable length or longer. Ridable length is defined as the total (cumulative) length of the lane minus any section lengths identified as not to be evaluated below. IRI data will not be evaluated for the following roadway sections:

2020 EDITION V5.1 PLANT MIX SURFACING – 401

within the super-elevation transitions of these short radius curves; or

bridge decks with a concrete riding surface, concrete approach slabs, concrete roundabouts, and the terminal paving points of the project. Areas requiring corrective work will be identified using the surface profile or surface smoothness measurements of the finished surface. Correct surface profile defects greater than 0.40 inches (10 mm) in a distance of 25 feet (7.62 m) within 30 calendar days of notification but prior to seal and cover or plant mix seal operations. Correct surface profile defects by milling and filling deficient pavement depths or by diamond grinding excess pavement depths full travel lane width or at the discretion of the Project Manager. Corrected surface profile defects will be retested and evaluated for compliance. Correction of profile defects will not be cause to reevaluate any section for surface smoothness IRI values. Pavement thickness may be measured after profile corrections are made. The final in- place thickness must not vary from the planned thickness by more than 0.02 foot (6 mm) upon completion of diamond grinding. No contract adjustment will be allowed for segments which do not meet this requirement. Ensure corrected pavements do not create a transverse height difference between adjacent lanes exceeding ⅛-inch (3 mm). Fog seal corrected areas if the roadway is not chip sealed prior to winter suspension. Quality incentive allowances will be used to offset any price reductions on progress estimates. Remove and replace any 0.5-mile (0.8 km) or shorter segment of roadway that does not meet the applicable IRI requirements for the project category unless other corrective action is approved by the Project Manager. Remove and replace the segment by milling 0.15 feet (45 mm) or to the lift line if within 0.02 feet (6 mm), whichever is greater and replacing with new material meeting contract requirements. Any segment requiring removal and replacement will be tested and evaluated for compliance only. No IRI values will be adjusted from the original surface profile measurements. All work to prepare the roadway for testing, including sweeping, grinding and traffic control prior to the ride test, is incidental to the work and is not measured for payment. All work to complete any corrective action and re-testing, including but not limited to sweeping and traffic control, is incidental to the work and is not measured for payment. Include all costs and resources to prepare the roadway for surface tolerance testing in the plant mix surfacing item.

section meeting the surfacing smoothness values for all paved areas excluded from the ride specification in accordance with Subsection 401.03.23(A) . The Contractor will be notified of segments to be corrected within 10 business days after the surface was placed. Perform all corrective work at Contractor expense. Surfaces will be checked for compliance at joints, bridge ends, and other sections where ride characteristics or other evidence indicates the surface tolerance is outside the specifications. Surface smoothness will be analyzed by traditional survey methods or may be evaluated using an Inertial Profiler System following Department procedures. Correct surface profile defects greater than 0.40 inches (10 mm) within a distance of 25 feet (7.62 m) in any direction. Correct out of specification plant mix surfacing by diamond – PLANT MIX SURFACING 2020 EDITION V5.1 grinding, cold milling a minimum depth of 0.15 feet (45 mm) the full width of the defect but not less than the paver width, or other approved method. If removing and replacing, extend the repair area for a minimum of 50 feet (15.2 m) each side of the defective pavement and fill with like-material compacted to the specified density. Ensure the corrected pavement and adjoining surface meet the smoothness specifications.

.24 Rumble Strips

Construct rumble strips when specified. Cut the rumble strips into the finished plant mix surfacing. Use a machine equipped with a rotary type cutting head capable of making the cuts to the dimensions and pattern shown in the Detailed Drawings . Produce the rumble strips without tearing and snagging the pavement. Remove resulting debris from the roadway before opening to traffic. Do not allow debris to enter any waterways. Establish a control line and locate the rumble strips on the shoulder 6 inches (150 mm) outside of the travel lane. The offset may be adjusted to avoid longitudinal pavement joints. Do not place rumble strips where concrete barrier rail or other roadside features prevent placement as specified. If seal and cover is not scheduled to be completed within 10 business days after cutting rumble strips, fog seal the finished rumble strips. Apply fog seal to finished rumble strips as follows:

for fog seal.

.25 Approaches

Furnish the same plant mix surfacing and asphalt binder as specified in the contract for approaches. Produce plant mix in accordance with Section 401. The Contractor has the option of submitting a plan for the use of non-polymer modified asphalt cement in plant mix surfacing for private approaches, sidewalks, parking lots, bike paths and other miscellaneous handwork not subject to mainline traffic. The plan must list the specific areas within the R/W where the use of non-polymer modified asphalt cement is proposed. The Contractor may use the approved production mix design with non-polymer modified binder provided no changes are made to the gradation and no net cost increase is applied to the price of the plant mix surfacing. In lieu of using the approved production mix design, a previous Department verified mix design may be requested for transfer. The Department may direct the Contractor to revert to the use of modified asphalt at any time. Non-modified asphalt will be paid at the invoice price plus freight under miscellaneous work for actual quantities used. QA for non-modified asphalt will be tested on a separate lot basis. Plant mix surfacing with non-modified asphalt cement will be paid at the unit bid price. Quantities of plant mix surfacing designated as “miscellaneous” by contract line item will not be subject to lot-by-lot QA evaluation.

401.04METHOD OF MEASUREMENT

.1 Plant Mix Surfacing

Plant mix surfacing is measured by the ton (MT) after complete mixing of all materials. The pay weight includes the asphalt cement and hydrated lime in the mixture, although they are also measured and paid for separately. 2020 EDITION V5.1 PLANT MIX SURFACING – 401

.2 Commercial Plant Mix Surfacing

Commercial plant mix surfacing is measured by the ton (MT) after complete mixing of all materials. The pay weight includes the asphalt cement and hydrated lime in the mixture but are not measured and paid for separately.

.3 Plant Mix/Commercial Plant Mix – Miscellaneous

Plant Mix Surfacing – Miscellaneous is measured by the ton (MT) after complete mixing of all materials. The pay weight includes the asphalt cement and hydrated lime, although they are measured and paid for separately. Commercial Plant Mix – Miscellaneous is measured by the ton (MT) after complete mixing of all materials. The pay weight includes asphalt cement and hydrated lime but are not measured and paid for separately. Quantities placed in conjunction with production (mainline) paving will not be measured separately or paid for under any of the Miscellaneous bid items.

.4 Asphalt Cement

When not included in another item, asphalt cement is measured by the ton (MT) as specified to the nearest ton (MT), in accordance with Subsection 402.04, excluding anti-stripping additive.

.5 Hydrated Lime

When not included in another item, hydrated lime is measured by the ton (MT) in accordance with Subsection 109.01. Hydrated lime exceeding 1.6% by total weight of mix is not measured for payment as hydrated lime.

.6 Rumble Strips

Rumble strips are measured by the mile (km) along the centerline of the roadway, less all gaps in the rumble strips due to ramp terminals, objects, etc. Each individual line of rumble strips is measured separately. Fog seal for rumble strips is not measured for payment.

.7 Tack Coat

Tack coat is measured for payment in accordance with Subsection 407.04.

401.05BASIS OF PAYMENT

Payment for the completed and accepted quantities is made under the following: Pay Item Pay Unit Asphalt Cement Ton (MT) Commercial Plant Mix Surfacing Ton (MT) Hydrated Lime Ton (MT) Plant Mix Surfacing Ton (MT) Rumble Strip Mile (km) For commercial plant mix no separate payment will be made for asphalt cement, fillers, hydrated lime, and additives. The contract unit price for rumble strips will be adjusted as shown in Table 401-8: – PLANT MIX SURFACING 2020 EDITION V5.1 TABLE 401-8 PRICE ADJUSTMENTS DUE TO LINE DEVIATIONS Line Deviation From The True Line Price Adjustment 0.0 to 0.15-foot (0 to 45 mm) in 500 feet (152 m) none 0.15 to 0.25-foot (45 to 75 mm) in 500 feet (152 m) 50% price reduction greater than 0.25-foot (75 mm) in 500 feet (152 m) correct as directed

.1 Binder Replacement

Plant mix surfacing is eligible for a binder replacement incentive. The incentive will be based on the asphalt binder savings realized by the incorporation of recycled materials into the plant mix. The cost of the total binder saved, based on total % binder in the mix and % virgin binder used, will be calculated for incentive. Half of the total savings will be paid to the Contractor as incentive as described below. Certify the cost of the specified asphalt binder (FOB at the refinery) by submitting form MDT-CON-401-1 and copies of the binder invoices. Submit this information before paving is complete. If the certified price varies by more than 20% of the bid price or if this information is not submitted in the specified timeframe, no incentive will be paid. Furnish a mix design meeting all the requirements of Section 401 with the inclusion of recycled materials. Include extracted gradations and percent binder of the RAP and/or RAS in the mix design. Base this information on samples taken of the materials to be used on the project. The mix design must also include the percent of binder, by total weight of mix, to be replaced with recycled binder. Include the costs associated with all work to incorporate recycled materials into the plant mix in the plant mix surfacing bid item. The plant mix and asphalt binder will be measured and paid for in accordance with the contract. Separate incentives will be calculated for each type of plant mix that incorporates recycled materials. At the completion of all plant mix work, the incentive paid to the contractor will be calculated per the following: Incentive = (0.5)(AC% Total - AC%Virgin)(TTotal)(CPAC) Where: • AC%Total is the average AC percentage calculated during production of the plant mix item (expressed as a decimal rounded to the nearest thousandth). • AC%Virgin is the total virgin AC used (tons) to produce the plant mix item divided by TTotal (expressed as a decimal rounded to the nearest thousandth). • T Total is total tons of plant mix placed and accepted by the Department. • CPAC is the certified invoice price for the asphalt binder as described above or the asphalt binder bid unit price, whichever is less. No incentive will be paid on Commercial Plant Mix.