For sealing cracks showing exfiltration or infiltration of water, with or without pressure, polyurethane resin will be used and for immediate stop of exfiltation / infiltration under pressure, polyurethane foam is the appropriate material to use. Both materials will be applied with a single component pump, high-pressure, air-less.
Resin injection is achieved through a non-return valve called “paker”.
Installing the packers is alternately, on both sides of the crack. The holes for packers will be at a distance equal to half the thickness between the concrete element and the crack. The distance between packers is equal to the thickness of the injected concrete element. Holes for packers will be made at a 45˚ angle to the surface, towards the crack, so as to intersect the crack at a depth approximately equal to half the thickness of the injected concrete element. After drilling, the holes will be blown with air to remove dust. The packers are fixed by tightening the rubber gasket. Before starting the injection, remove all non-return valves, except the non-return valve of the packer with which the injection starts.
If during injection resin comes out through the crack, the resin will be dimmed using fast mortar.
Mix only the necessary amount of mortar with water until you reach a rich consistency and the obtained material is manually pressed on the shutter until curing.If pressure water is present, a pre-injection with polyurethanic foam shall be made to prevent movement during curing. Foam is a two component polyurethane resin, which, when mixed with water, expands 37 times. The result is an open cell foam through which resin can be injected for permanent crack sealing.