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<br />PGSF WMVD Storm and Combined Sewer - Construction Package 2 Concrete Repair <br />Project No. 180162 03 01 00 - 10 <br /> <br />3.06 REINFORCING REPAIR <br />A. After preparation and prior to application of anti-corrosion inhibitor (where applicable), <br />inspect existing reinforcing bars for deterioration. Notify Engineer where section loss of <br />reinforcing bar is more than 25 percent, or 20 percent in two or more adjacent bars. <br />B. As directed by Engineer, add supplemental and/or replacement reinforcing. <br />1. Install new reinforcing by tying to existing remaining reinforcing. <br />2. Provide final touchup protection by re-application of anti-corrosion inhibitor to <br />reinforcing surfaces, scratches, damaged areas, etc. <br />3.07 SURFACE MORTAR APPLICATION <br />A. Apply mortar according to manufacturer’s written instructions. <br />B. For hand troweled or spray applied applications, work material firmly into the sides and <br />bottom of repair area. Apply a scrub coat prior to full depth application. Build up <br />prepared areas in multiple lifts as required by product manufacturer limitations. <br />C. For hand troweled or spray applied applications, follow manufacturer’s recommendations <br />for maximum lift thickness, additional surface preparation, and subsequent reapplication <br />time. <br />D. Finish surface to match existing adjacent concrete surfaces and/or as required per <br />coating manufacture’s recommendations. <br />E. Moist cure mortar repair for a minimum of 5-days or in accordance with manufacturer’s <br />recommendations. <br />F. Notify Engineer for observation after repair mortar has been applied at the initial mockup <br />area and after the repair has cured. Notify Engineer again at intervals specified or as <br />subsequent repair mortar is applied and cured. Once scheduled, allow at least 48 hours <br />for observation by Engineer and/or inspection by Owner’s testing agency for pull-off <br />tensile bond strength testing. <br />G. Coordinate with Engineer and Owner’s testing lab to provide up to six (6) smooth test <br />areas for pull-off testing at the completed mortar repair areas. Test areas shall be <br />prepared by Contractor by grinding smooth. The first completed repair area shall be <br />provided at the mockup area with the remaining five (5) areas to be selected after the <br />mortar repair application is completed. <br />H. Contractor to provide follow up repairs to pull-off test areas. <br />3.08 EPOXY CRACK INJECTION <br />A. Expose identified cracks by lightly grinding along length of crack. Clean crack and <br />adjacent areas with oil-free compressed air or low-pressure water to remove loose <br />particles. Do not use acids or corrosives for cleaning. Notify Engineer for observation of <br />crack repair areas prior to epoxy crack injection. Allow at least 48 hours advance notice <br />for observation by Engineer.