Chip out crack/joint in a “U” shaped slot as per the drawing shown above. The slot it to be 1” (25 mm) wide and 2” - 3” (50 - 75 mm) deep. A “V” shaped slot is not acceptable. The slot may be saw cut instead of chipped but ensure that the slot is dovetailed or otherwise shaped such that there will be mechanical interlock of materials placed into the slot at a later stage.
In area of greatest water flow, drill hole or cavity 0.5” (13 mm) deeper into slot to accommodate a bleeder hose. A bleeder hose is a minimum 1.5 foot (0.5 m) length of smooth surfaced, fairly rigid tubing. Its purpose is to relieve the water pressure while crack/joint is being repaired.
Remove all loose material within the slot and to 6” (150 mm) on either side of slot. Clean, profile (ICRI CSP-3) and saturate this area with water. Allow water to soak in and then remove all surface water.
Place one end of bleeder hose into the hole or cavity and, while holding hose steady, apply Xypex Patch’n Plug to the slot around the hose. Multiple applications of Patch’n Plug may be necessary to secure the hose in place.
To stop active water flow apply Xypex Patch’n Plug to half the depth of remaining slot area. Patch’n Plug is mixed by adding one part clean water to 3.5 parts Patch’n Plug powder by volume. If slot has dried out before Patch’n Plug application, it should be re-wetted. Remove bleeder hose and pack hole with Xypex Patch’n Plug to stop all active water flow.
Apply a slurry coat of Xypex Concentrate at a cover- age of 1.5 lb./sq. yd. (0.8 kg/m2) in the slot over the Patch’n Plug and on the 6” (150 mm) strip of concrete surface on either side of the slot. Application may be performed by gloved hand or by brush.
While slurry coat is still tacky, fill slot to surface level with Xypex Concentrate in Dry-Pac consistency. Dry-Pac is mixed by adding one part clean water to six parts Xypex Concentrate powder by volume. Blend by trowel for 10 - 15 seconds only (lumps should be present in mixture). Apply the Dry-Pac by gloved hand, then compress it tightly by using a pneumatic packing tool or a hammer and block.
Wet the Dry-Pac surface lightly with water, then apply a slurry coat of Xypex Concentrate at a coverage of 1.5 lb./sq. yd. (0.8 kg/m2) over the repaired area and to 6” (150 mm) strip on either side of slot.
Cure by keeping moist using Gamma Cure and/or by fog spraying periodically with water for two to three days. Open to water contact per Xypex Coatings guidelines.
When early exposure to water is required:
1. In Step 7 – replace the top 1⁄4” - 1⁄2” (6 - 12 mm)
of Xypex Concentrate Dry-Pac with Xypex Patch’n Plug.
2. Step 8 and Step 9 – eliminate.