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<br /> <br />ASPHALT PAVING & SURFACING 02 5500-5 <br />A. Base material shall be spread and compacted in conformance with the <br />applicable requirements of Section 26-1.03D and 1.03E of the State Standard <br />Specifications. <br />B. Base material shall be compacted to a relative density of not less than 95% <br />when tested in accordance with the requirements of ASTM D-1557. <br />3.03 PRIME, TACK COATS, AND SURFACE PREPARATION <br />A. The liquid asphalt used for prime coat shall conform to the provisions of current <br />Caltrans Specifications Section 92, “Asphalt Binders,” and shall be Grade SC- <br />70 unless otherwise directed by the Engineer. Liquid asphalt prime coat shall <br />be applied to the aggregate base course prior to applying the AC layer to <br />protect the integrity of aggregate base during construction and help reduce <br />dust. Prime coat shall be applied at the rate of 0.25 gallons per square yard <br />unless otherwise directed. After the liquid asphalt has penetrated the base <br />course, any excess standing on the surface shall be absorbed to the <br />satisfaction of the Engineer with a suitable coating of clean sand. <br />B. Tack coat shall be applied to all vertical surfaces of existing pavement, curbs, <br />gutters, catch basins, manhole frames, and construction joints in the surfacing <br />to the horizontal surface of all existing pavements to be resurfaced and other <br />surfaces designated. Asphaltic paint binder shall be provided in sufficient <br />quantity to produce a thin, uniform black, glossy coat of asphalt. Pools in <br />unevenly distributed material shall be spread out by squeegee, broom or other <br />means so an even coverage is attained. Immediately in advance of placing <br />HMA, apply additional tack coat to damaged areas or where loose or <br />extraneous material is removed. Do not track tack coat onto pavement surfaces <br />beyond the job site. Discontinue application of emulsion early enough to comply <br />with lane closure specifications and daily work advancement. Do not track tack <br />coat onto pavement surfaces beyond the job site. <br />C. Distributed areas shall be redistributed by means of hand brooms. Tack coat <br />shall be applied in conformance with the applicable requirements of Section <br />39-2.01C(3)(f) of the State Standard Specifications. <br />D. Prior to placing asphalt over existing pavement, sweep the pavement clean of <br />loose dirt to the satisfaction of the Engineer. <br />3.04 ASPHALT CONCRETE <br />A. Asphalt concrete shall be proportioned, mixed, placed, spread and compacted <br />in conformance with the applicable requirements of Section 39-2.01C of the <br />State Standard Specifications and the following requirements: <br />1. Asphalt concrete shall be placed only upon specific approval of the Engineer. <br />When, in the opinion of the Engineer, the surface is too wet, no asphalt <br />concrete shall be placed. The Engineer will make the final decision as to <br />whether conditions are satisfactory for paving. <br />2. No asphalt concrete surface course shall be placed when the ambient <br />temperature is less than 50° F. All compaction shall be completed before the <br />surface temperature drops below 200°F. <br />7.A. - Page 14 of 121 <br />20