402— Asphalt Base Course

402.1 Description

1 Construct an a sphalt b ase course on a prepared foundation.

402.2 Materials

402.2.1 General

1 Use materials that meet the applicable requirements of Subsection 401.2 and SC-M-402.

402.2.2 Composition of Mixture

1 Combine the mineral aggregates and binder in such proportions that the composition by weight of the finished asphalt is within the limits set forth in Subsection 401.2.3 and SC -M-402.

402.3 Construction

402.3.1 Equipment

1 The equipment requirements specified in Subsection 401.3. 2 also apply to asphalt base course.

402.3.2 Preparation of Subgrade

1 Before placing the asphalt base course, prepare the subgrade according to Section 208.

402.3.3 Application of Tack Coat

1 When multiple lifts of asphalt base course are required, apply a tack coat conforming to Subsection 401. 3.13. No direct payment is made for the necessary tack coat.

402.4 Measurement

1 Measurement of the quantity for Asphalt Base Course is determined accord ing to Subsection 401. 4. 2 All work and cost incidental to the preparation of the subgrade is included in the item Asphalt Base Course and is not measured for payment, except where the work is indicated on the Plans as Unclassified Exc avation, in which cas e, it is meas ured and paid for according to Section 203.