432.1General Description
This work includes milling existing asphaltic concrete pavement to restore proper grade and/or transverse slope, removing structurally unsound material, providing clearance for overlay in curb and gutter sections, or other purposes deemed necessary due to existing conditions. Perform the work according to these Specifications and Plan details. 432.1.01 Definitions General Provisions 101 through 150. 432.1.02 Related References
GDT 126 432.1.03 Submittals General Provisions 101 through 150.
432.2Materials
432.2.01 Delivery, Storage, and Handling When specified, stockpile the milled material at locations shown on the plans.
degradation, segregation, and reconsolidation. 515 515 515 515 515 515 515
432.3Construction Requirements
432.3.01 Personnel General Provisions 101 through 150. 432.3.02 Equipment
Use power-driven, self-propelled milling equipment that is the size and shape that allows traffic to pass safely through areas adjacent to the work. Also, use equipment that is: • Designed to mill and remove a specified depth of existing asphalt paving • Equipped with grade and slope controls operating from a string line or ski and based on mechanical or sonic operation • Capable of removing pavement to an accuracy of 1/8 in. (3 mm) • Furnished with a lighting system for night work, as necessary • Provided with conveyors capable of side, rear, or front loading to transfer the milled material from the roadway to a truck
When micro-milling is specified, use power-driven, self-propelled micro-milling equipment possessing the size and shape to allow traffic safe passage through areas adjacent to the work. Also, ensure the micro milling is equipped as follows: • Equipped with a cutting mandrel with carbide or equivalent tipped cutting teeth designed for micro-milling bituminous pavement full lane width to close tolerances. Micro-milling heads with less than full lane widths may be used for non-mainline travel way when approved by the engineer and milled surface meets all specified acceptance criteria. • Equipped with grade and slope controls operating from a string line or ski and based on mechanical or sonic operation • Capable of removing pavement to an accuracy of 1/16 in. (1.6 mm.) • Furnished with a lighting system for night work, as necessary • Provided with conveyors capable of side, rear, or front loading to transfer the milled material from the roadway to a truck.
Provide power brooms, vacuum sweepers, power blowers, or other means to remove loose debris or dust. Do not allow dust control to restrict visibility of passing traffic or to disrupt adjacent property owners. 432.3.03 Preparation General Provisions 101 through 150. 432.3.04 Fabrication General Provisions 101 through 150. 516 516 516 516 516 516 516
432.3.05 Construction
Follow the plans to mill the designated areas and depths including bridge decks, shoulders, and ramps, as required. Ensure the following requirements are met:
maintain a constant cross slope between extremities in each lane.
directed by the Engineer.
process and left exposed to traffic. Bevel them back at least 3 in. for each 2 in. (75 mm. for each 50 mm.) of material removed. Use an attached mold board or other approved method.
avoid creating a traffic hazard and to produce a smooth surface.
approach slabs, drainage structures, and utility appurtenance greater than 1/2 in. (12.5 mm) that are left open to traversing vehicles. Place the temporary tie-in at taper rate of at least 6 to 1 horizontal to vertical distance.
surface and do not place asphaltic concrete on the milled surface until removal is complete. The reclaimed asphaltic pavement becomes the Contractor’s property unless otherwise specified.
Ensure the micro-milling operations comply with Subsection 432.3.05.B, when micro-milling is specified in the contract to remove aged open-graded mix types, remove wheel ruts and other surface irregularities; restore proper grade and/or transverse slope of pavement as indicated in the Plans and as directed by the Engineer. The micro-milled surface shall provide a texture suitable for use as a temporary riding surface or an immediate overlay with OGFC or PEM with no further treatment or overlays. Micro-milling is required when placing OGFC or PEM mixtures on a milled surface. The use of the micro-milled pavement as a temporary riding surface shall be a maximum of five (5) Available days. Perform the work according to these Specifications and Plan details.
ramps, as required. Ensure the following requirements are met: • Prior to commencement of the work, construct a test section that is 1000 ft. (305 m) in length with a uniformly textured surface and cross section as approved by the Engineer. • The final pavement surface shall have a transverse pattern of 0.2 in. (5 mm) center to center of each strike area. The targeted difference between the ridge and valley (RVD) measurement of the mat surface shall not exceed 1/16 in. (1.6 mm). • Milled surface acceptance testing will be performed using the Laser Road Profiler in accordance with GDT-126. Ensure the measured indices meet a target of 825 mm/km in the test section. • Work shall be halted and the contractor shall submit a written plan of action detailing what steps will be taken to improve operations if any of these requirements are exceeded in the test section. If approved by the Engineer, the contractor will construct another 1000 ft. (305 m) test section. This test section shall be located in a different area than the initial section using the approved corrective action. This designated section shall be micro-milled to conform to the same requirements as those required in the initial test section. The contractor shall not be allowed to start continual micro-milling until an acceptable test section is obtained. 517 517 517 517 517 517 517
between extremities in each lane.
Plans or directed by the Engineer.
and left exposed to traffic. Bevel the vertical edges back at least 3 in. for each 2 in. (75 mm for each 50 mm) of material removed. Use an attached mold board or other approved method.
when removing material at ramp areas and ends of milled sections.
bridge approach slabs, drainage structures, and utility appurtenances greater than 1/2 in areas left open to traversing vehicles. Place the temporary tie-in at taper rate of at least 6 to 1 horizontal to vertical distance.
milled surface and do not place asphaltic concrete on the milled surface until removal is complete. 432.3.06 Milling Quality Acceptance
Ensure that the milling operation produces a uniform pavement texture that is true to line, grade, and cross-section. Milled pavement surface acceptance testing will be performed using the Laser Road Profiler method in GDT 126. Milled pavement will be evaluated on individual test sections, normally 1 mile (1 km) long. When the milled surface is to be left as the final wearing surface, ensure that indices do not exceed: • 1025 on milled pavement surfaces on interstates when the milled surface will be the final wearing surface • 1175 for other on-system routes when the milled surface will be the final wearing surface • 1175 on Interstates and 1325 for other on-system routes if the milled surface will be overlaid Remill mile (kilometer) areas to meet the specified limits when the indices are exceeded. Remill at no additional cost to the Department. Milled pavement surfaces are subject to visual and straightedge inspection. Keep a 10 ft. (3 m) straightedge near the milling operation to measure surface irregularities of the milled pavement surface. Remill irregularities greater than 1/8 in. per 10 ft. (3 mm in 3 m) at no additional cost to the Department. Ensure that the cross slope is uniform and that no depressions or slope misalignments greater than 1/4 in. per 12 ft. (6 mm in 3.6 m) exist when the slope is tested with a straightedge placed perpendicular to the center line. 518 518 518 518 518 518 518
Ensure the micro-milling operation produces a uniform pavement texture true to line, grade, and cross section. Micro-mill additional depth to eliminate excessive scabbing of the in place material as directed by the Engineer. Micro-milled pavement surface acceptance testing will be performed using the Laser Road Profiler method in GDT 126. Micro-milled pavement will be evaluated on individual test sections, measuring 0.50 mile (0.50 km). Ensure micro- milled pavement meets specified measured tolerances for RVD and profile surface smoothness indices of Target 825 mm/km and not exceed the Correction index of 900 mm/km • Micro-milled pavement surfaces are subject to visual and straightedge inspections. Ensure a 10 ft. (3 m). straightedge is kept at the micro-milling operation to measure surface irregularities of the milled pavement surface. • Any areas exceeding 1/8 in. (3.2 mm) between the ridge and valley of the mat surface or fail to meet pavement surface acceptance testing using the Laser Road Profiler shall subject the micro-milled surface to a pay reduction of 20% based on the micro-milling unit cost per square yd. at the recommendation of the Office of Materials and Testing. • Any areas exceeding 3/16 in. (4.8 mm) between the ridge and valley of the mat surface or fail to meet pavement surface acceptance testing using the Laser Road Profiler shall subject the locations to being removed and replaced with acceptable material as directed by the Engineer at no additional cost to the
Department. All corrective work shall be performed in a minimum 500 ft. section.
• Ensure the cross slope is uniform and no depressions or slope misalignments greater than 1/4 in. per 12 ft.
(6 mm in 3.6 m) exist when the slope is tested with a straightedge placed perpendicular to the center line.
432.3.07 Contractor Warranty and Maintenance
General Provisions 101 through 150.
432.4Measurement
Conventional milling and micro-milling existing asphaltic concrete pavement is measured by the square yard (meter) as
described in Subsection 109.01, Measurement and Quantities.
432.4.01 Limits
General Provisions 101 through 150.
432.5Payment
Conventional milling and micro-milling asphaltic concrete pavement, measured as specified, will be paid for at the
Contract Unit Price bid per square yard (meter). The price bid for this item includes the credit value of all Reclaimed
Asphalt Pavement (RAP) recovered, and no adjustment in the unit price for this item or other items will be considered
for variations in the amount of RAP actually recovered.
Payment is full compensation for furnishing equipment, milling, hauling, stockpiling milled material, and satisfactorily
performing the work.
Payment will be made under:
Item No. 432 Mill asphaltic concrete pavement, ___ in (mm) depth Per square yard (meter)
Item No. 432 Mill asphaltic concrete pavement, variable depth Per square yard (meter)
Item No. 432 Micro-mill asphaltic concrete pavement, variable depth Per square yard (meter) 519519519519519519519
432.5.01 Adjustments
General Provisions 101 through 150.. 520 520 520 520 520 520 520
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