Step 1 Rout out crack/joint in a "U" shaped slot one inch (25 mm) wide and at least 1.5 inches (37 mm) deep. A "V" shaped slot is not acceptable.
Step 2 Remove all loose material and saturate with water. Allow water to soak into concrete and then remove all surface water.
Step 3 Apply one slurry coat of Xypex Concentrate at a coverage of 1.5 lb./sq. yd. (0.8 kg/m2) to slot and to six inch (150 mm) strip on either side of slot. Application may be performed by brush or by gloved hand.
Step 4 While slurry coat is still tacky, fill slot to surface with Xypex Concentrate Dry-Pac mixed in the following proportions: 1 part clean water to 6 parts Concentrate by volume. Blend by trowel for 10 to 15 seconds only (lumps should be present in the mixture). Apply Dry-Pac by gloved hand, then compress it tightly using a pneumatic packing device or a hammer and block.
Step 5 Wet 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.
Step 6 Cure by fog spraying periodically with water for two days or apply Xypex Gamma Cure immediately after the slurry coat has set.
2. AGAINST A FLOW OF WATER
Step 1 Rout out faulty concrete to sound concrete.
Step 2 Remove all loose material and saturate area with water. llow time for concrete to absorb water, then remove any freee-standing water.
Step 3 To stop the flow of water, fill the cavity to surface with Xypex Patch'n Plug. For large cavities, first handrub a layer of Patch'n Plug into the cavity to help "key" the patch. Large patches may require the addition of aggregate to the Patch'n Plug. For the size and amount of aggregate, please refer to the product data sheet. Where increased bonding is required, use suitable bonding agent.
Step 4 After the patch has set, apply a slurry coat of Xypex Concentrate over repaired are at a coverage of 1.5 lb./sq. yd. (0.8 kg/m2).
Step 5 Cure by fog spraying periodically with water for two days or apply Xypex Gamma Cure immediatley after the slurry coat has set.
