Technical Reference

Treatment Procedures.

Step-by-step waterproofing, structural repair and rehabilitation methods, grouped by the chemistry they use, each mapped to the Armstrong products that carry it out. Select a treatment to view the full procedure and product recommendations.

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Treatment · Injection grouting

Resin Injection for Wet Cracks

Two-component resins for damp cracks and construction joints

Applications

Damp or wet cracks with no flowNon-moving construction jointsBasement wallsTank walls

Procedure

If water is running, inject a PU grout first and return when the flow has stopped.
For RAPIDSTRONG GROUT PCR 89, drill 12 to 14 mm holes on alternating sides of the crack and fix nozzles with RAPIDSTRONG QS 113 mixed with cement.
Stir each part separately. Mix RAPIDSTRONG GROUT VM 99 Part A and Part B at 1:1 in a two-component pump; never mix it in bulk. Add accelerator at 0.2% where ingress is heavy.
Inject with slow, steady pressure from the lowest port, moving on when resin flows from the next port.
Re-inject through the same ports if the crack is not full.
After full cure, close the holes with ROOFCRETE AR.

Important Suggestions

RAPIDSTRONG GROUT VM 99 must not be thinned, needs concrete cured 28 days, and contains a flammable monomer: no smoking, flame or sparks near the work. It is for non-moving joints, not expansion joints.

Why This Treatment?

These resins travel the crack to its full depth and seal damp concrete that a PU foam alone would not bond. They can be re-injected through the same ports.

Recommended Products

RAPIDSTRONG GROUT VM 99

Two-component PU injection resin; working time 25 to 30 seconds; expands 1 to 12 times in water.

RAPIDSTRONG GROUT PCR 89

Injection resin for damp cracks.

Dosage & Coverage

RAPIDSTRONG GROUT VM 99Part A : Part B = 1 : 1; accelerator 0.2%