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PGSF WMVD Storm and Combined Sewer - Construction Package 2 Cast-in-Place Concrete <br />Project No. 180162 03 30 00 - 26 <br /> <br />2. Crack Repair Method 1: <br />a. Fill the joint or crack by drilling holes to the affected area (following the product <br />manufacturer’s details), install injection ports, and force epoxy or chemical grout <br />(expanding urethane) into the joint under pressure. <br />b. Material type and repair procedures shall be approved by Engineer. <br />c. After injection and curing; ports, sealing mix, and surface shall be cleaned and <br />worked to match the adjacent specified finish. <br />3. Crack Repair Method 2: <br />a. Fill cracks with low viscosity epoxy, applied by pouring/flooding crack zone until <br />cracks are filled. Prepare surface, install, and cure according to manufacturer’s <br />recommendations. <br />b. At a minimum, prepare surface to be clean and dry with no visible detrimental <br />material in cracks to be filled. Conform to temperature limitations of epoxy. Clean <br />and refinish to match adjacent surfaces. <br />4. Crack Repair Method 3: <br />a. Cut a bevel groove 3/8 to 1/2 inch in width and depth, use backer rod or tape, <br />and fill with sealant in accordance with manufacturer’s instructions. <br />b. This repair method is only used where approved by Engineer. <br />c. Groove and sealant shall be applied on wet or hydrostatic pressure side of <br />surface. <br />C. Repair Method Use: <br />1. Repair Method 1: For cracks in walls, surfaces sloped 1:1 or greater, beams, <br />columns, structural slabs, overhead surfaces, and liquid retaining surfaces. Need for <br />repair depends upon crack width, location, and leakage. <br />2. Epoxy grout is used for repair of structural cracks and chemical grout (expanding <br />urethane) for repair of non-structural cracks at liquid-containing structures. The <br />Engineer shall determine whether a crack is classified as structural or non-structural. <br />3. Repair Method 2: Utilized in lieu of Method 1 for slabs when approved by Owner’s <br />Representative. Final finish shall match adjacent surfaces. <br />4. Repair Method 3: Limited to dry-surface slabs, walls subject to less than three feet of <br />liquid pressure, or as approved by Engineer. Repair Method 3 is not an equivalent <br />repair method to Repair Methods 1 or 2, which shall be considered the standards. <br />3.16 WATERTIGHTNESS TESTING AND REPAIR <br />A. Liquid Containing Concrete Tanks And Channels: <br />1. Watertightness testing shall comply with ACI 350.1 and the following requirements. <br />2. Concrete tanks, basins, reservoirs and channels which have walls or slabs subjected <br />to hydrostatic pressure shall be tested for watertightness. The tests shall be made <br />after the structure is complete and the concrete has achieved its specified 28-day <br />strength, but prior to application of waterproof coating or backfill. <br />3. Filling of the tank for watertightness testing shall not exceed a rate of 4 feet/hour. Fill <br />with water to the maximum operating water surface. Keep water at this level for at <br />least 72 hours prior to start of test.