1636 Asphalt Paving
16361 General
The final levels of sub-base shall be checked for compliance with Section 1633 of this Specification prior to the placement of bituminous paving.
Adequate precaution shall be taken to ensure that asphalt work is not sprayed during rainy weather and while the sub-base is excessively wet.
16362 Asphalt paving shall be constructed as follows:-
The base coarse shall be in penetration macadam course of 70mm thickness placing 40-70mm rise crushed gravel laid on sub-base/hard-core. Compact by using 8 passes of a 12 ton roller and adjust final level with + 10mm.
The surface shall be treated with AC - 85/100 or other specified hot bitumen at the rate shown in drawings or schedules. The surface, shall while hot, be covered with 8 - 12mm crushed gravel and rolled until gravel is firm is position and no movement is noticed under the roller.
The surface course to be applied after 10 days (during the time when base-course is open to traffic) shall consist of a 20mm wearing course applied as follows: -
Apply hot bitumen AC-180/200 or other specified at the rate shown in drawing or schedules and spread evenly.
The surface shall, while hot be covered with stone chipping of 8 - 12mm and rolled thoroughly. Check road level for uniformity.
A fine spray of AC-180/200 or other specified shall be applied at the rate shown in drawings or schedules and covered with 3 - 5mm stone chipping and rolled with a 10-16ton roller for a minimum pass of 4 times.
The final level shall be checked for required accuracy.
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