Epoxy Crack Injection

Crack and leak repair methods are described below. They are treated separately from other concrete repair methods because they are significantly different from methods for thin or thick repairs. In many ways, properly repairing cracks and leaks can be the most difficult type of repair. In many structures, if the concrete cracks, there is also a water leak. The seven-step process should be followed for crack repairs. In other words, the cause and extent of the cracks or leaks should be determined, including whether the cracks are dormant or active (moving); exposure conditions should be considered, wetting and drying, etc.

There are two basic types of crack repair: (1) resin injection, and (2) adding additional reinforcement. These two methods can be performed separately or in combination. Additional reinforcement is typically added if the shear or tensile capacity of a structural element has been, or might be, exceeded.

Polyurethane Resin Injection

Resin injection is used to repair concrete that is cracked or delaminated, as well as to seal cracks or joints in concrete that are experiencing water leakage. Epoxy resins are used to structurally rebond cracks that are dormant and relatively dry, while various polyurethanes and some methacrylic acrylates are used to seal cracks or joints that leak water. It is usually not possible to structurally rebond cracks that are leaking water, are dirty or are very wet. Also, due to the high cost of resin injection, it is not normally used to repair shallow cracks, drying shrinkage cracks, or pattern cracking. Therefore, if repairs are needed for these types of cracks, a sealing approach is usually more effective.

Epoxy Concrete Staples

The Concrete Staple, an engineered piece of metal that bridges cracks to hold two pieces of concrete together. Overlay can be installed right over the top.

It works while other methods generally fail because it addresses the specific problems of cracked concrete.

The Staple is made from steel with a high-yield strength to overcome the incredible weight and pressures of concrete. It’s placed across the crack to not only hold the existing crack together but also to keep the adjacent micro-cracks from failing and opening up.

It has right angle bends on each end to grip the concrete on either side of the crack. As a result, it does not have to depend on friction only to hold the two pieces of concrete together.