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<br />PGSF WMVD Storm and Combined Sewer - Construction Package 2 Concrete Repair <br />Project No. 180162 03 01 00 - 8 <br /> <br />2. Use only proven protection methods appropriate to each area and surface being <br />protected. <br />3. Provide temporary barricades, barriers, and directional signage to exclude people <br />from areas where concrete repair Work is being performed. <br />4. Contain dust and debris generated by concrete repair Work in accordance with OSHA <br />standards and prevent dust and debris from reaching public or adjacent surfaces. <br />5. Protect slabs and other surfaces along haul routes from damage, wear, and staining. <br />6. Protect adjacent surfaces and equipment by covering them with heavy polyethylene <br />film and waterproof masking tape. If practical, remove items, store, and reinstall after <br />potentially damaging operations are complete. <br />7. Neutralize and collect alkaline and acid wastes for legal disposal off property. <br />8. Dispose of debris and runoff from operations by legal means and in a manner that <br />prevents soil erosion, undermining of paving and foundations, damage to <br />landscaping, and water penetration into building interiors. <br />C. Prevent solids such as aggregate or cementitious material from migrating from the work <br />area. Clean deposited sand or other materials resulting from concrete repair Work prior <br />to reintroducing flow. <br />D. Preparation for Concrete Removal: Examine areas to be repaired to determine best <br />methods to safely and effectively perform concrete repair Work. Examine adjacent areas <br />to determine what protective measures will be necessary. Make explorations, probes, <br />and inquiries as necessary to determine condition of construction to be removed. <br />1. Verify that affected utilities have been disconnected and capped. <br />2. Inventory and record conditions of items to be removed for reinstallation or salvage. <br />E. Reinforcing-Bar Preparation: Remove rust from exposed reinforcing bars by abrasive <br />blast cleaning in accordance with SSPC SP-6. <br />1. Where section loss of reinforcing bar is more than 25 percent, or 20 percent in two or <br />more adjacent bars, splice in new reinforcing bars and/or notify Engineer to <br />determine appropriate repair method. <br />F. Surface Preparation for Concrete Surfaces: <br />1. Remove delaminated and deteriorated concrete surface material by chipping, bush <br />hammer, and/or pressure water blasting. <br />2. Sweep and vacuum roughened surface to remove debris. <br />3. Roughen surface of concrete to a minimum ¼-inch amplitude. <br />4. Provide final cleaning of concrete to remove dirt, oils, films, and other materials <br />detrimental to patching mortar. <br />3.04 EXTENT OF CONCRETE REMOVAL <br />A. Do not overload structural elements with debris. <br />B. Provide ¼-inch deep saw cut at perimeter of repair areas resulting in a defined repair <br />area with a neat, rectangular, area. <br />C. Remove deteriorated and delaminated concrete by breaking up and dislodging from <br />reinforcement.