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I <br /> 1 <br /> 2 5-04.3(4)A Crack Sealing I <br /> 3 <br /> 4 5-04.3(4)A1 General <br /> 5 When the Proposal includes a pay item for crack sealing, seal all cracks '/4 inch in width <br /> 6 and greater. <br /> 7 I <br /> 8 Cleaning: Ensure that cracks are thoroughly clean, dry and free of all loose and foreign <br /> 9 material when filling with crack sealant material. Use a hot compressed air lance to dry <br /> 10 and warm the pavement surfaces within the crack immediately prior to filling a crack with <br /> 11 the sealant material. Do not overheat pavement. Do not use direct flame dryers. Routing <br /> 12 cracks is not required. <br /> 13 <br /> 14 Sand Slurry: For cracks that are to be filled with sand slurry, thoroughly mix the <br /> 15 components and pour the mixture into the cracks until full. Add additional CSS-1 cationic <br /> 16 emulsified asphalt to the sand slurry as needed for workability to ensure the mixture will <br /> 17 completely fill the cracks. Strike off the sand slurry flush with the existing pavement <br /> 18 surface and allow the mixture to cure. Top off cracks that were not completely filled with <br /> 19 additional sand slurry. Do not place the HMA overlay until the slurry has fully cured. I <br /> 20 <br /> 21 The sand slurry shall consist of approximately 20 percent CSS-1 emulsified asphalt, <br /> 22 approximately 2 percent portland cement, water (if required), and the remainder clean <br /> 23 Class 1 or 2 fine aggregate per section 9-03.1(2). The components shall be thoroughly <br /> 24 mixed and then poured into the cracks and joints until full. The following day, any cracks <br /> 25 or joints that are not completely filled shall be topped off with additional sand slurry. After I <br /> 26 the sand slurry is placed, the filler shall be struck off flush with the existing pavement <br /> 27 surface and allowed to cure. The HMA overlay shall not be placed until the slurry has <br /> 28 fully cured. The requirements of Section 1-06 will not apply to the portland cement and 111 <br /> 29 sand used in the sand slurry. <br /> 30 <br /> 31 In areas where HMA will be placed, use sand slurry to fill the cracks. I <br /> 32 <br /> 33 In areas where HMA will not be placed, fill the cracks as follows: <br /> 34 <br /> 35 1. Cracks '/4 inch to 1 inch in width - fill with hot poured sealant. <br /> 36 2. Cracks greater than 1 inch in width —fill with sand slurry. ' <br /> 37 <br /> 38 Hot Poured Sealant: For cracks that are to be filled with hot poured sealant, apply the <br /> 39 material in accordance with these requirements and the manufacturer's I <br /> 40 recommendations. Furnish a Type 1 Working Drawing of the manufacturer's product <br /> 41 information and recommendations to the Engineer prior to the start of work, including the <br /> 42 manufacturer's recommended heating time and temperatures, allowable storage time <br /> 43 and temperatures after initial heating, allowable reheating criteria, and application <br /> 44 temperature range. Confine hot poured sealant material within the crack. Clean any <br /> 45 overflow of sealant from the pavement surface. If, in the opinion of the Engineer, the 111 <br /> 46 Contractor's method of sealing the cracks with hot poured sealant results in an excessive <br /> I <br /> 2023 FEDERAL OVERLAY <br /> FEDERAL AID#STBGUL-2715(011) <br /> WO#3788 March 2,2023 SP-78 <br />