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Newman Center: Masonry Repair <br />SB Project No, 116-132 <br />Carefully remove heavy accumulations of rigid materials from concrete surface with sharp <br />chisel. Do not scratch or chip concrete surface. <br />2. Remove asphalt and tar with solvent -type paste paint remover per manufacturer's <br />instructions. <br />3.5 CLEANING CONCRETE <br />A. Cold Water Soak: <br />1. Apply cold water by intermittent spraying to keep surface moist. <br />2. Use perforated hoses or other means that apply a fine water mist to entire surface being <br />cleaned. <br />3. Apply water in cycles of five minutes on and twenty minutes off. <br />4. Continue spraying until surface encrustation has softened enough to permit its removal by <br />water wash, as indicated by cleaning tests for 72 hours. <br />5. Remove soil and softened surface encrustation from surface with cold water. <br />B. Concrete Surface Cleaner: <br />1. Wet surface with cold or hot water applied by low-pressure spray. <br />2. Apply diluted cleaning solution to the concrete surface using a brush or low pressure spray. <br />3. Let the cleaner stay on the surface for 1-10 minutes based on testing. Gently scrub heavily <br />soiled areas. <br />4. Working from bottom to top, rinse the surface thoroughly with clean water. The best <br />combination of rinsing pressure and water volume is provided by washing equipment <br />generating 400-1000 psi with water flow rate of 6-8 gallons per minute delivered through a 15- <br />45 degree fan spray tip. <br />5. Repeat steps as necessary. <br />6. Do not let cleaning solution dry on the surface. If drying occurs, lightly wet surfaces with fresh <br />water and reapply the cleaner in a gentle scrubbing manner. <br />C. Mold, Mildew, and Algae Removal: <br />Wet surface with cold or hot water applied by low-pressure spray. <br />2. Apply mold, mildew, and algae remover by brush. <br />3. Scrub surface with medium -soft brushes until mold, mildew, and algae are thoroughly <br />dislodged and can be removed by rinsing. Use small brushes for mortarjoints and crevices. <br />Dip brush in mold, mildew, and algae remover often to ensure that adequate fresh cleaner is <br />used and that surface remains wet. <br />4. Rinse with cold or hot water to remove mold, mildew, and algae remover and soil. <br />5. Repeat cleaning procedure where required to produce the cleaning effect established by <br />mockup. <br />D. Fast Acting Paint Stripper <br />Working from the bottom to the top, apply 1/8" to thick to dry surface. <br />U E',NJNG __ Faae W3 UI <br />