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<br />PGSF WMVD Storm and Combined Sewer - Construction Package 2 Concrete Repair <br />Project No. 180162 03 01 00 - 11 <br /> <br />B. Apply surface seal in accordance with Manufacturer’s instructions to designated crack <br />face prior to injection to prevent escape of injection epoxy. <br />C. Place injection ports as recommended by epoxy manufacturer, spacing no farther apart <br />than thickness of member being injected. Seal injection ports in place with capping <br />adhesive. Seal entire crack length and allow to cure prior to injection. <br />D. Injection Procedure: Store epoxy at minimum of 70° F. <br />1. Start injection into each crack at lowest elevation entry port. <br />2. Continue injection at first port until adhesive begins to flow out of next higher port. <br />3. Plug first port and start injection at second port until adhesive flows from next port. <br />4. Inject entire crack with same sequence. <br />E. Finishing Procedure: <br />1. Cure epoxy adhesive after cracks have been filled to allow surface seal removal <br />without draining or runback of epoxy material from cracks. <br />2. Remove surface seal from cured injection adhesive. <br />3. Indentations or protrusions caused by placement of entry ports shall be filled with <br />surface mortar or ground smooth with the adjacent surface. <br />4. Remove surface seal material and injection adhesive from concrete surfaces. <br />3.09 HYDRO-ACTIVE CRACK INJECTION <br />A. For Cracks, Wet and/or Leaking – repair utilizing a low viscosity, hydrophobic, closed cell <br />polyurethane foam injection system. <br />B. Lightly grind crack surface as needed to remove efflorescence and to expose/open up <br />face of the crack. <br />C. Starting 6 inches away from crack, drill injection holes at 45 degrees to intersect crack at <br />a minimum of 6 inches deep from the crack surface. <br />D. Provide temporary entry ports in these drilled holes spaced 12 to 18 inches or as <br />required to allow movement of fluid between ports. Provide temporary paste-over seal at <br />concrete surface to prevent seepage of injected material. <br />E. Inject water into crack to flush out crack and to remove dirt, dust, and contaminants. <br />Inject urethane foam with accelerating catalyst as required after the water flush. <br />F. Inject material into prepared ports under pressure using automated equipment that is <br />appropriate for this application. <br />G. Start injection at the lowest elevation entry port. Continue injection until repair material <br />appears in adjacent entry port. Repeat this process and continue from port to port until <br />entire crack is filled. <br />H. Remove surface paste-over seal and excess adhesive by grinding or other approved <br />method.