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2025 FEDERAL OVERLAY, BROADWAY – CALIFORNIA ST TO 18TH ST SPECIAL PROVISIONS <br />FEDERAL AID# STBGUL-2715(012); COE PW# 3841 SP-75 May 6, 2025 <br /> <br />4. Shall mix the HMA sufficiently to obtain a uniform temperature throughout the 1 <br />mixture. 2 <br /> 3 <br />5-04.3(3)E Rollers 4 <br />Rollers shall be of the steel wheel, vibratory, oscillatory, or pneumatic tire type, in good 5 <br />condition and capable of reversing without backlash. Operation of the roller shall be in 6 <br />accordance with the manufacturer’s recommendations. When ordered by the Engineer 7 <br />for any roller planned for use on the project, the Contractor shall provide a copy of the 8 <br />manufacturer’s recommendation for the use of that roller for compaction of HMA. The 9 <br />number and weight of rollers shall be sufficient to compact the mixture in compliance 10 <br />with the requirements of Section 5-04.3(10). The use of equipment that results in 11 <br />crushing of the aggregate will not be permitted. Rollers producing pickup, washboard, 12 <br />uneven compaction of the surface, displacement of the mixture or other undesirable 13 <br />results shall not be used. 14 <br /> 15 <br />5-04.3(4) Preparation of Existing Paved Surfaces 16 <br />When the surface of the existing pavement or old base is irregular, the Contractor shall 17 <br />bring it to a uniform grade and cross-section as shown on the Plans or approved by the 18 <br />Engineer. 19 <br /> 20 <br />Preleveling of uneven or broken surfaces over which HMA is to be placed may be 21 <br />accomplished by using an asphalt paver, a motor patrol grader, or by hand raking, as 22 <br />approved by the Engineer. 23 <br /> 24 <br />Compaction of preleveling HMA shall be to the satisfaction of the Engineer and may 25 <br />require the use of small steel wheel rollers, plate compactors, or pneumatic rollers to 26 <br />avoid bridging across preleveled areas by the compaction equipment. Equipment used 27 <br />for the compaction of preleveling HMA shall be approved by the Engineer. 28 <br /> 29 <br />Before construction of HMA on an existing paved surface, the entire surface of the 30 <br />pavement shall be clean. All fatty asphalt patches, grease drippings, and other 31 <br />objectionable matter shall be entirely removed from the existing pavement. All 32 <br />pavements or bituminous surfaces shall be thoroughly cleaned of dust, soil, pavement 33 <br />grindings, and other foreign matter. All holes and small depressions shall be filled with an 34 <br />appropriate class of HMA. The surface of the patched area shall be leveled and 35 <br />compacted thoroughly. Prior to the application of tack coat, or paving, the condition of 36 <br />the surface shall be approved by the Engineer. 37 <br /> 38 <br />A tack coat of asphalt shall be applied to all paved surfaces on which any course of HMA 39 <br />is to be placed or abutted; except that tack coat may be omitted from clean, newly paved 40 <br />surfaces at the discretion of the Engineer. Tack coat shall be uniformly applied to cover 41 <br />the existing pavement with a thin film of residual asphalt free of streaks and bare spots at 42 <br />a rate between 0.02 and 0.10 gallons per square yard of retained asphalt. The rate of 43 <br />application shall be approved by the Engineer. A heavy application of tack coat shall be 44 <br />applied to all joints. For Roadways open to traffic, the application of tack coat shall be 45 <br />limited to surfaces that will be paved during the same working shift. The spreading 46 <br />equipment shall be equipped with a thermometer to indicate the temperature of the tack 47 <br />coat material. 48 <br /> 49