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I <br /> 1 crushing of the aggregate will not be permitted. Rollers producing pickup, washboard, <br /> I <br /> 2 uneven compaction of the surface, displacement of the mixture or other undesirable <br /> 3 results shall not be used. <br /> I <br /> 4 <br /> 5 5-04.3(4) Preparation of Existing Paved Surfaces <br /> 6 When the surface of the existing pavement or old base is irregular, the Contractor shall <br /> I 7 bring it to a uniform grade and cross section as shown on the Plans or approved by the <br /> 8 Engineer. <br /> 9 <br /> I 10 Preleveling of uneven or broken surfaces over which HMA is to be placed may be <br /> 11 accomplished by using an asphalt paver, a motor patrol grader, or by hand raking, as <br /> 12 approved by the Engineer. <br /> I 13 <br /> 14 Compaction of preleveling HMA shall be to the satisfaction of the Engineer and may <br /> 15 require the use of small steel wheel rollers, plate compactors, or pneumatic rollers to <br /> I 16 avoid bridging across preleveled areas by the compaction equipment. Equipment used <br /> 17 for the compaction of preleveling HMA shall be approved by the Engineer. <br /> 18 <br /> 19 Before construction of HMA on an existing paved surface, the entire surface of the <br /> 20 pavement shall be clean. All fatty asphalt patches, grease drippings, and other <br /> 21 objectionable matter shall be entirely removed from the existing pavement. All <br /> I 22 pavements or bituminous surfaces shall be thoroughly cleaned of dust, soil, pavement <br /> 23 grindings, and other foreign matter. All holes and small depressions shall be filled with an <br /> 24 appropriate class of HMA. The surface of the patched area shall be leveled and <br /> ' 25 26 compacted thoroughly. Prior to the application of tack coat, or paving, the condition of <br /> the surface shall be approved by the Engineer. <br /> 27 <br /> I <br /> 28 29 A tack coat of asphalt shall be applied to all paved surfaces on which any course of HMA <br /> is to be placed or abutted; except that tack coat may be omitted from clean, newly paved <br /> 30 surfaces at the discretion of the Engineer. Tack coat shall be uniformly applied to cover <br /> I 31 the existing pavement with a thin film of residual asphalt free of streaks and bare spots at <br /> 32 a rate between 0.02 and 0.10 gallons per square yard of retained asphalt. The rate of <br /> 33 application shall be approved by the Engineer. A heavy application of tack coat shall be <br /> I 34 applied to all joints. For Roadways open to traffic, the application of tack coat shall be <br /> 35 limited to surfaces that will be paved during the same working shift. The spreading <br /> 36 equipment shall be equipped with a thermometer to indicate the temperature of the tack <br /> 37 coat material. <br /> 38 <br /> 39 Equipment shall not operate on tacked surfaces until the tack has broken and cured. If <br /> I <br /> 40 41 the Contractor's operation damages the tack coat it shall be repaired prior to placement <br /> of the HMA. <br /> 42 <br /> I 43 The tack coat shall be CSS-1, or CSS-1 h emulsified asphalt. The CSS-1 and CSS-1 h <br /> 44 emulsified asphalt may be diluted once with water at a rate not to exceed one part water <br /> 45 to one part emulsified asphalt. The tack coat shall have sufficient temperature such that <br /> I <br /> 46 47 it may be applied uniformly at the specified rate of application and shall not exceed the <br /> maximum temperature recommended by the emulsified asphalt manufacturer. <br /> I <br /> 2023 FEDERAL OVERLAY <br /> FEDERAL AID#STBGUL-2715(011) <br /> IWO#3788 March 2,2023 SP-77 <br />