SECTION 461 — BITUMINOUS PRIME COAT


461.1 DESCRIPTION — This work is the conditioning and treating of an absorbent, non-bituminous base course or absorbent existing surface, with an application of bituminous material and, if required, a blotter material.


461.2 MATERIAL —

(a) Bituminous Material. One of the following, as specified in Section 702:

Class of Material
Type of Material
Mixing Temperature, F
Minimum
Maximum
MC-30
Cut-back Petroleum Asphalt
70
120
MC-70
Cut-back Petroleum Asphalt
100
150


(b) Fine Aggregate (for Blotting). Section 703.1 461.3 CONSTRUCTION —

(a) Conditioning Existing Surface. Section 401.3(f). Bituminous painting of existing surfaces and the application of a tack coat are not required.

(b) Application of Bituminous Material. Use a distributor, as specified in Section 460.3(b). Apply at a rate of 0.20 to 0.50 gallon per square yard, within specified temperature range.
Insure uniformity at the junction of two applications.
Following application, do not disturb the prime coat. Allow the bituminous material to penetrate, and be absorbed by, the treated surface, until the bituminous material is completely cured, as determined by the Inspector-in-Charge.
Satisfactorily correct uncoated or lightly coated areas with an application of additional bituminous material.
Twenty-four hours after the application of bituminous material, for areas showing an excess of such material, cover with sufficient dry fine aggregate to blot up or remove excess prime coat material, as directed.

(c) Protection of Treated Surface. Maintain and protect treated surface against damage. Satisfactorily repair damaged areas before placing succeeding construction.


461.4 MEASUREMENT AND PAYMENT — Square Yard