Laserfiche WebLink
CITY OF EVERETT SPECIAL PROVISIONS <br /> <br />3rd Ave Water Quality Facility Division 5 – SURFACE TREATMENTS September 12, 2024 <br />AND PAVEMENTS <br />WO No. – UP 3775 SP - 153 <br />other foreign matter. Fill all holes and small depressions with an appropriate class <br />of HMA. Level and thoroughly compact the patched area surface. Obtain <br />Engineer approval of the surface prior to the application of tack coat or paving. <br />Apply an asphalt tack coat to all paved surfaces that HMA is to be placed or <br />abutted; except, that tack coat may be omitted from clean, newly paved surfaces <br />at the Engineer’s discretion. Uniformly apply tack coat to cover the existing <br />pavement with a thin film of residual asphalt free of streaks and bare spots at a <br />rate between 0.02 and 0.10 gallons per square yard of retained asphalt. Obtain <br />application rate approval from Engineer. Apply a heavy application of tack coat to <br />all joints. For Roadways open to traffic, limit the application of tack coat to <br />surfaces that will be paved during the same working shift. Provide spreading <br />equipment equipped with a thermometer to indicate the temperature of the tack <br />coat material. <br />Do NOT allow equipment to operate on tacked surfaces until the tack has broken <br />and cured. Repair tack coat if the Contractor’s operation damages the tack coat <br />prior to placement of the HMA. <br />Provide tack coat consisting of CSS-1 or CSS-1h emulsified asphalt. The CSS-1 <br />and CSS-1h emulsified asphalt may be diluted once with water at a rate not to <br />exceed one part water to one part emulsified asphalt. Provide tack coat having <br />sufficient temperature such that it may be applied uniformly at the specified rate of <br />application and not exceed the maximum temperature recommended by the <br />emulsified asphalt manufacturer. <br />5-04.3(4)A Crack Sealing <br />5-04.3(4)A1 General <br />When the Proposal includes a pay item for crack sealing, seal all cracks 1/4- <br />inch in width and greater. <br />Cleaning: Ensure that cracks are thoroughly clean, dry and free of all loose <br />and foreign material when filling with crack sealant material. Use a hot <br />compressed air lance to dry and warm the pavement surfaces within the <br />crack immediately prior to filling a crack with the sealant material. Do NOT <br />overheat pavement. Do NOT use direct flame dryers. Routing cracks is not <br />required. <br />Sand Slurry: For cracks that are to be filled with sand slurry, thoroughly mix <br />the components and pour the mixture into the cracks until full. Add additional <br />CSS-1 cationic emulsified asphalt to the sand slurry as needed for workability <br />to ensure the mixture will completely fill the cracks. Strike off the sand slurry <br />flush with the existing pavement surface and allow the mixture to cure. Top <br />off cracks that were not completely filled with additional sand slurry. Do NOT <br />place the HMA overlay until the slurry has fully cured. <br />Provide sand slurry consisting of approximately 20 percent CSS-1 emulsified <br />asphalt, approximately 2 percent portland cement, water (if required), and the <br />remainder clean Class 1 or 2 fine aggregate per section 9-03.1(2). <br />Thoroughly mix components and then pour into the cracks and joints until full. <br />The following day, top off any cracks or joints that are not completely filled <br />with additional sand slurry. After the sand slurry is placed, strike off filler flush <br />with the existing pavement surface and allow to cure. Do NOT place the HMA <br />overlay until the slurry has fully cured. The requirements of Section 1-06 will <br />not apply to the portland cement and sand used in the sand slurry. <br />In areas where HMA will be placed, use sand slurry to fill the cracks.