6-39 Following placement of the PADC mixture to the appropriate line, grade and thickness, begin
rolling when the mat has cooled sufficiently to support the weight of an 8 to 12 ton steel- wheel tandem roller. Mat temperature at the time of initial rolling shall be approximately 175° F to 225 °F. The maximum number of roller passes shall be three . Consolidate the drainage layer sufficiently with rolling so as to support the weight of equipment that will place the next layer of pavement. Do not compact the drainage layer to the extent that it is not free draining or that the aggregate is crushed. Density acceptance testing is not required for this layer. No construction traffic will be allowed to travel on any PADC layer . Only equipment necessary to place the next layer of pavement will be allowed on the drainage layer. Do not place PADC that will not be covered with the next layer of pavement during the same calen dar year or within 15 days of placement if the PADC is placed in January or February.
652-5 Quality Management System for Asphalt Pavements
Produce the PADC in accordance with the Section 609 , with the following exceptions. Sample and test the completed mixture from each mix design per plant per year at the following minimum frequency during mix production: Accumulative Production Increment Number of Samples per Increment 500 tons Record the following data on the standardized control charts and in accordance with the requirements of Section 7.4 of the Asphalt QMS Manual :
a.Aggregate Gradation Test Results:
1.12.5 mm (Type P -57 Only)
2.9.5 mm (Excluding Type P -57)
3.4.75 mm
4.2.36 mm
5.0.075 mm Sieves
b.Binder Content, %, P b
652-6 Measurement and Payment
Permeable Asphalt Drainage Course, Type ____ will be paid as the actual number of tons of drainage course incorporated into the completed and accepted work. The drainage course will be measured by being weighed in trucks on certified platform scales or other certified weighing devices. Asphalt Binder for Plant Mix will paid in accordance with Article 620 -4. Payment will be made under : Pay Item Pay Unit Permeable Asphalt Drainage Course, Type P -78M Ton Permeable Asphalt Drainage Course, Type P -57 Ton
654-1 Description
Perform the work covered by this section including, but not limited to , repairing of existing pavement with asphalt plant mix in order to provide a safe, passable and convenient condition for traffic, or to replace pavement removed in order to remove or to place pipe lines.
Source: North Carolina Standard Specifications for Roads and Structures, 2024 Edition. Pages 295–295 of 857.