Granite Construction 5/14/2020 - Laserfiche WebLink

, I 1 Before construction of HMA on an existing paved surface, the entire surface of the 2 pavement shall be clean. All fatty asphalt patches, grease drippings, and other objectionable 3 matter shall be entirely removed from the existing pavement. All pavements or bituminous 4 surfaces shall be thoroughly cleaned of dust, soil, pavement grindings, and other foreign I 5 matter. All holes and small depressions shall be filled with an appropriate class of HMA. The 6 surface of the patched area shall be leveled and compacted thoroughly. Prior to the 7 application of tack coat, or paving, the condition of the surface shall be approved by the I 8 Engineer. 9 10 A tack coat of asphalt shall be applied to all paved surfaces on which any course of HMA is I 11 to be placed or abutted; except that tack coat may be omitted from clean, newly paved 12 surfaces at the discretion of the Engineer. Tack coat shall be uniformly applied to cover the 13 existing pavement with a thin film of residual asphalt free of streaks and bare spots at a rate I 14 between 0.02 and 0.10 gallons per square yard of retained asphalt. The rate of application 15 shall be approved by the Engineer. A heavy application of tack coat shall be applied to all 16 joints. For Roadways open to traffic, the application of tack coat shall be limited to surfaces 17 that will be paved during the same working shift. The spreading equipment shall be 18 equipped with a thermometer to indicate the temperature of the tack coat material. 19 20 Equipment shall not operate on tacked surfaces until the tack has broken and cured. If the 21 Contractor's operation damages the tack coat it shall be repaired prior to placement of the 22 HMA. 1 23 24 The tack coat shall be CSS-1, or CSS-1 h emulsified asphalt. The CSS-1 and CSS-1 h 25 emulsified asphalt may be diluted once with water at a rate not to exceed one part water to I 26 one part emulsified asphalt. The tack coat shall have sufficient temperature such that it may 27 be applied uniformly at the specified rate of application and shall not exceed the maximum 28 temperature recommended by the emulsified asphalt manufacturer. 29 30 5-O4.3(4)A Crack Sealing I 31 32 5-O4.3(4)A1 General 33 When the Proposal includes a pay item for crack sealing, seal all cracks % inch in width and I 34 greater. 35 36 Cleaning: Ensure that cracks are thoroughly clean, dry and free of all loose and foreign I 37 material when filling with crack sealant material. Use a hot compressed air lance to dry and 38 warm the pavement surfaces within the crack immediately prior to filling a crack with the 39 sealant material. Do not overheat pavement. Do not use direct flame dryers. Routing cracks I 40 is not required. 41 42 Sand Slurry: For cracks that are to be filled with sand slurry, thoroughly mix the 43 components and pour the mixture into the cracks until full. Add additional CSS-1 cationic 44 emulsified asphalt to the sand slurry as needed for workability to ensure the mixture will 45 completely fill the cracks. Strike off the sand slurry flush with the existing pavement surface I 46 and allow the mixture to cure. Top off cracks that were not completely filled with additional 47 sand slurry. Do not place the HMA overlay until the slurry has fully cured. 48 49 The sand slurry shall consist of approximately 20 percent CSS-1 emulsified asphalt, 50 approximately 2 percent portland cement, water (if required), and the remainder clean Class I 2020 PAVEMENT MAINTENANCE OVERLAY WORK ORDER 3727 PAGE 49 OF 79 SPECIAL PROVISIONS FEBRUARY 20,2020