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<br />PGSF WMVD Storm and Combined Sewer - Construction Package 2 Concrete Repair <br />Project No. 180162 03 01 00 - 12 <br /> <br />3.10 CONCRETE JOINTS (CONSTRUCTION AND EXPANSION) <br />A. Remove old sealant by mechanical means. Do not use solvents. <br />B. Abrasive blast to clean previously sealed concrete joint surfaces. <br />C. Install backer rod or tape to control sealant depth as recommended by manufacturer. <br />D. Apply sealant, tool, and cure as recommended by manufacturer. <br />3.11 COATING <br />A. Verify substrate has cured and dried out according to coating manufacturer’s <br />requirements for surface preparation. <br />B. Verify that all Work in the area to be coated has been completed and installed such that <br />no additional penetrations or holes will be drilled through the final coating, include <br />support framing, gate frames, pipe penetrations, etc. <br />C. Apply filler/surfacer, abrasive blast, and clean surface prior to coating application <br />according to Section 09 96 00. <br />D. Cracks and adjacent substrate to be sealed must be clean, sound, and free of surface <br />moisture or frost. Remove laitance, curing compounds, and other bond inhibiting <br />materials by abrasive blasting. Prior to application, blow cracks out with oil-free <br />compressed air. <br />E. At larger cracks where underside of slab is accessible, seal cracks with an epoxy resin <br />adhesive paste to act as a dam to hold liquid methacrylate until cured, to minimize <br />excessive dripping and loss of product. <br />F. Mix and apply liquid methacrylate resin according to manufacturer’s instructions. Pour <br />mixed methacrylate resin onto substrate and allow to pond over cracks until cracks are <br />sealed. Spread material out over substrate, before it starts to set, using squeegees <br />and/or rollers. <br />G. Continue to apply material until cracks and surface is sealed. The surface should be wet <br />looking with no visible surface film. <br />H. After at least 20 minutes, cover the treated area with a broadcast of dry 8/20 sand at a <br />rate of 15 to 20 pounds per 100 square feet. Remove loose sand after drying (at least 4 <br />hours). <br />3.12 FIELD QUALITY CONTROL <br />A. Manufacturers Field Service: Engage manufacturers' factory-authorized service <br />representatives to provide Project-site training and inspections to observe progress and <br />quality of Work. <br />B. Manufacturer’s factory-authorized services representatives should also be available for <br />consultation and to provide on-site assistance when requested by Contractor and/or <br />Engineer.