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<br />PGSF WMVD Storm and Combined Sewer - Construction Package 2 Concrete Repair <br />Project No. 180162 03 01 00 - 9 <br /> <br />D. Remove additional concrete where necessary to provide a depth of removal of at least <br />¼ inch over entire defined repair area. <br />E. Where half or more of the perimeter of reinforcing bar is exposed, bond between <br />reinforcing bar and surrounding concrete is broken, or reinforcing bar is corroded, <br />remove concrete from entire perimeter of bar and to provide at least ¾-inch clearance <br />around bar. <br />F. Test areas where concrete has been removed by tapping with hammer; remove <br />additional concrete until unsound and dis-bonded concrete is completely removed. <br />Provide a pH test of concrete surface to assure enough deteriorated concrete is removed <br />to obtain a pH neutral surface. <br />G. Acceptable surface preparation must produce a concrete surface with a minimum pH of <br />9.0 to be confirmed by surface pH testing. If after surface preparation, the surface pH <br />remains below 9.0, perform additional water blasting, cleaning, or abrasive blast <br />cleaning until additional pH testing indicates an acceptable pH level. <br />H. Clean removal areas of loose concrete, dust, and debris. <br />I. Notify Engineer for observation of surface following cleaning and surface preparation in <br />advance of surface mortar application. Allow at least 48 hours for observation by <br />Engineer and/or inspection by Owner’s testing agency for soundness testing, pull-off <br />tensile bond strength testing, and pH testing. <br />J. Where required by Contract Documents, coordinate with Engineer and Owner’s testing <br />agency to provide up to six (6) smooth test areas for pull-off testing. Test areas are <br />prepared by grinding smooth. The first test area shall be provided at the mockup area <br />with the remaining five (5) areas to be selected after remaining surface preparation is <br />completed. <br />3.05 REINFORCING PROTECTION APPLICATION <br />A. Where reinforcing bar is less than ½ exposed and there are no signs of corrosive <br />products, do not apply anti-corrosion inhibitor. <br />B. Where reinforcing bar is ½ or more exposed or there are signs of corrosive products, <br />remove concrete clear all around as specified above. Apply anti-corrosion inhibitor to the <br />entire bar circumference. <br />C. Application of anti-corrosion inhibitor shall be made to reinforcing bars by stiff brush and <br />according to manufacturer's instructions. Use care not to spill over or coat concrete and <br />partially exposed reinforcing bar surfaces. <br />D. Apply anti-corrosion inhibitor to reinforcing bars in two coats. Allow first coat to dry two to <br />three hours before applying second coat. Allow second coat to completely dry before <br />placing repair mortar.