313SUPERPAVE ASPHALT MIXTURE DESIGN, STANDARD CONSTRUCTION, BASE COURSE

CONSTRUCTION, BASE COURSE

313.1DESCRIPTION—This work is the standard construction of a plant-mixed asphalt base course on a

prepared surface using a volumetric mixture design developed with the Superpave Gyratory Compactor

313.2MATERIAL—Section 413.2

313.3CONSTRUCTION—Section 4 13.3 as specified for s tandard construction and with additions and

modifications as follows:

Do not place base course on prepared surfaces that are wet or if the temperature of the air or the prepared surface is 35F or lower. If work is halted because of weather conditions, the Representative may allow the Contractor to place limited quantities of base course that are en route to the project.

1.b Spreading and Finishing. Add the following: If the indicated compacted depth of a Superpave 25.0 mm asphalt base course is more than 6 inches, place the asphalt base course in two or more layers of approximately equal compacted depth, with no layer less than 3 inches or more than 6 inches. If the indicated compacted depth of a Superpave 37.5 mm asphalt base course is more than 8 inches, place the asphalt base course in two or more layers of approximately equal compacted depth, with no layer less than 4 inches or more than 8 inches.

The pavement is defective if irregularities are more than 1/4 inch.

Control the loose depth of each layer to construct the base course to the compacted depth indicated and within the specified tolerance. On the top lift and in the presence of the Inspector, drill full -depth cores at one random location selected by the Inspector according to PTM No. 1 in each 3,000 square yards of completed base course and at other locations the Inspector suspects are deficient. The Inspector will measure the depth of the full -depth cores according to PTM No. 737. Pavement deficient in depth by 1/2 inch or more and that cannot be satisfactorily corrected is defective. After the Inspector completes depth measurements, backfill, compact, and seal core holes with the mixture used to construct the course. Immediately start correcting courses or pavement that are deficient in depth at the core location and proceed longitudinally and transversely until the depth is less than 1/2 inch deficient of the design depth.

313.4MEASUREMENT AND PAYMENT—Section 413.4(a), with modifications as follows:

1.f Superpave Asphalt Mixture Design, Base Course. Square Yard or Ton.