Epoxy Injection Process
Here are the basic steps ALPS Concrete Repair follows for successful low-pressure crack injection. The type of epoxy used and the time required for injection will vary with each job depending on the width of the crack, the wall thickness, and other conditions.
Epoxy Injection Step 1 – Install injection ports – ALPS Concrete Repair installs surface ports that are short rigid-plastic tubes with a flat base. We use these as entryways for getting the epoxy material into the crack. They eliminate the need to drill into the concrete, reducing labor time and cleanup. The base of the port is placed directly over the crack and bonded to the surface with an epoxy paste. A general rule-of-thumb is to space the ports an inch apart for each inch of wall thickness.
Epoxy Injection Step 2 – Seal the surface – ALPS Concrete Repair uses an epoxy adhesive to seal over the surface ports and exposed cracks. The paste cures in about 20 to 45 minutes to provide a surface seal with excellent bond characteristics that holds up under injection pressures. The entire exposed crack is covered with the paste, leaving only the port holes uncovered.
Epoxy Injection Step 3 – Inject the crack: ALPS Concrete Repair then begins injecting at the lowest port on the wall and continue until the epoxy or urethane begins to seep out of the next port in line. That’s the visual sign that the crack has been filled to that level. Plug the first port with the cap provided and move up to the next port, repeating this procedure until the entire crack has been filled with epoxy or urethane. Let the compression spring on the dispensing tool push the material into the crack using slow, constant pressure. This will reduce the possibility of leaks or blow-outs and allow time for the repair material to fully penetrate the crack.
Epoxy Injection Step 4 - Remove the ports - The epoxy will cure and penetrate into the cracks relatively quickly. Once the epoxy has cured ALPS Concrete Repair will remove the injection ports. If the repair area is in a highly visible area, the epoxy surface seal can be chipped away or ground off with a grinder leaving the area aesthetically pleasing.