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18TH STREET PEDESTRIAN IMPROVEMENTS 3741 RMT July 03, 2024 45 Compaction of preleveling HMA shall be to the satisfaction of the Engineer and may 1 require the use of small steel wheel rollers, plate compactors, or pneumatic rollers to 2 avoid bridging across preleveled areas by the compaction equipment. Equipment used 3 for the compaction of preleveling HMA shall be approved by the Engineer. 4 5 Before construction of HMA on an existing paved surface, the entire surface of the 6 pavement shall be clean. All fatty asphalt patches, grease drippings, and other 7 objectionable matter shall be entirely removed from the existing pavement. All 8 pavements or bituminous surfaces shall be thoroughly cleaned of dust, soil, pavement 9 grindings, and other foreign matter. All holes and small depressions shall be filled with an 10 appropriate class of HMA. The surface of the patched area shall be leveled and 11 compacted thoroughly. Prior to the application of tack coat, or paving, the condition of 12 the surface shall be approved by the Engineer. 13 14 A tack coat of asphalt shall be applied to all paved surfaces on which any course of HMA 15 is to be placed or abutted; except that tack coat may be omitted from clean, newly paved 16 surfaces at the discretion of the Engineer. Tack coat shall be uniformly applied to cover 17 the existing pavement with a thin film of residual asphalt free of streaks and bare spots at 18 a rate between 0.02 and 0.10 gallons per square yard of retained asphalt. The rate of 19 application shall be approved by the Engineer. A heavy application of tack coat shall be 20 applied to all joints. For Roadways open to traffic, the application of tack coat shall be 21 limited to surfaces that will be paved during the same working shift. The spreading 22 equipment shall be equipped with a thermometer to indicate the temperature of the tack 23 coat material. 24 25 Equipment shall not operate on tacked surfaces until the tack has broken and cured. If 26 the Contractor’s operation damages the tack coat it shall be repaired prior to placement 27 of the HMA. 28 29 The tack coat shall be CSS-1, or CSS-1h emulsified asphalt. The CSS-1 and CSS-1h 30 emulsified asphalt may be diluted once with water at a rate not to exceed one part water 31 to one part emulsified asphalt. The tack coat shall have sufficient temperature such that 32 it may be applied uniformly at the specified rate of application and shall not exceed the 33 maximum temperature recommended by the emulsified asphalt manufacturer. 34 35 5-04.3(4)A Crack Sealing 36 37 5-04.3(4)A1 General 38 When the Proposal includes a pay item for crack sealing, seal all cracks ¼ inch in width 39 and greater. 40 41 Joint sealant shall be used for transverse joints in paving. 42 43 Cleaning: Ensure that cracks are thoroughly clean, dry and free of all loose and foreign 44 material when filling with crack sealant material. Use a hot compressed air lance to dry 45 and warm the pavement surfaces within the crack immediately prior to filling a crack with 46 the sealant material. Do not overheat pavement. Do not use direct flame dryers. Routing 47 cracks is not required. 48