ITEM 13 A CRACK SEALING OR CRACK FILLING （13项裂纹密封或裂缝充填）.pdfVIP

ITEM 13 A CRACK SEALING OR CRACK FILLING OF ASPHALT PAVEMENTS 13.1 DESCRIPTION This item shall consist of furnishing all materials, equipment, labor, cleaning and clean up, traffic control and incidental items necessary for sealing or filling cracks of asphalt pavements. The purpose of crack sealing and crack filling is to prevent the intrusion of water and incompressibles. Crack sealing shall be applicable for cracks 1/4” to 3/4” wide or as recommended by manufacturer. Crack filler is recommended for cracks that are 1” or wider and / or exhibit edge deterioration. Crack Sealer is used for working cracks, cracks that have more than ¼” seasonal movement. Both hot and cold materials are currently available for crack sealing; however, this specification is meant to only apply to hot applied materials. Crack Filler should be used for nonworking cracks. Non-working cracks are cracks that have annual movement less than ¼”. Non working crack types may include wide transverse cracks. If a crack exhibits edge deterioration it should be filled not sealed. 13.2 MATERIALS Materials used for crack sealing shall meet or exceed requirements of ASTM D 6690 Type II and be listed on the CDOT approved products list. Crack sealers are typically viscous at high temperatures and applied with a wand and excess material is spread with a squeegee. The CONTRACTOR shall provide material certifications and manufacturer’s instructions for heating and application. /business/apl Materials used for crack filling shall be a premixed blend of polymer modified asphalt binder and wear resistant aggregates heated and mixed in a specialized melter. They are usually spread using a specialized device and smoothed with a heated float. The CONTR