161 ASPHALT BASE, WEARING, AND PATCHING AND LEVELING COURSES
401.1 -DESCRIPTION : This work shall consist of constructing one or more courses of asphalt concrete, mixed mechanically in a plant, composed of aggregate and asphalt material designed in accordance with either the Marshall or Superpave design system as specified in the contract documents, on a prepared foundation in accordance with these specifications and in r easonable close conformity with the lines, grades, weights or thicknesses, and cross sections shown on the Plans or established by the Engineer. The unit of measurement for asphalt concrete will be by the ton, square yard or cubic yard. The work will be accepted in accordance with these Specifications and the applicable requirements of Sections 105, 106, and 109.
401.2 -MATERIALS : The materials shall conform to the following requirements:
MATERIAL SUBSECTION Coarse Aggregate 703.1 thru 703.3 Note 1 & Note 2 (See MP 401.02.28 for exceptions and additions required for Superpave Items.) Fine Aggregate 702.3 (See MP 401.02.28 for additions required for Superpave Items) Mineral Filler 702.4 Performance Graded Binders 705.5
Note 1 The total shale, coal and other lightweight deleterious material and friable particles shall not exceed 3%. Note 2 When slag is specified in the contract, the coarse aggregate shall be slag which meets the requirements of 703.3, except as amended in this subsection.
401.2.1 –Performance Graded Binder Grade: The standard grade for Performance Graded (PG) binders shall be PG 64S -22, any deviation will be noted in the contract documents. PG 64H -22 shall be used on projects specified with over 20 million ESALs over the design life. PG 64S -22 binder may be used in asphalt placed below the top two lifts in any pavement section, scratch course and patching -and-leveling are not ide ntified as lifts.
CONSTRUCTION METHODS
401.3 -GENERAL : Construction methods to be used in performing the work shall be submitted to the Engineer for review prior to the start of work. This review may require modification of the proposed methods to provide the desired end product. All equipment, tools, machinery, and plant shall be maintained in a satisfactory working condition.