If there is concern about material leaking out the back of a crack, polyurethane foams should be used. These elastomeric, fast-setting foams are effective alternatives for applications involving only crack sealing (waterproofing) and not structural repair. They also begin to harden and foam within minutes of injection. This reduces the chances of the material flowing out of an injected crack while still in liquid form.
grouts are usually injected under pressure as a liquid resin into or
in the vicinity of the leak. Once the resin contacts water, a
chemical reaction occurs. Depending on the material formulation, the
grout/water combination forms either an expansive closed cell foam
or a gel. The foam created can be flexible and resilient
(hydrophilic) or ridged, meaning the cell structure of the foam
crushes when compressed (hydrophobic).
1) Drill into the RC slab
2) Insert the packers
into the RC slab or wall
||3) Fix the grouting hose into the packers and start grouting||
4) The grout will start