Cracks in concrete exposed to moisture should be repaired as quickly as possible to avoid more extensive and expensive damage.

Routing and sealing is the most common method of crack repair. In this procedure the crack is enlarged to permit the complete penetration of the repair compound. This method is most effective when a structural epoxy is gravity fed into the crack to return the slab to its original monolithic state, with all the structural properties unaltered. When this type of cracking is caused by improper joint placement, new joints should be cut and sealed to ensure a long-term repair. This method is excellent for secondary containment systems, warehouses, and distribution centers.

Flexible sealing using an elastomeric sealant will allow for movement in a crack that is still moving. The advantage to using a flexible sealant is that new joints do not have to be cut. The disadvantage is that elastomeric joint sealants are often not durable enough to handle heavy traffic. More expensive two-component urethane sealants can be used, but joints must meet depth and width criteria specific to the sealant.

With the development of high molecular weight methacrylate monomers cracking in large slabs can be sealed in one application. It is applied over the surface and easily penetrates and fills thin cracks. When cured it forms a rigid polymer that structurally repairs cracks and also provides a sealer that protects the concrete against water intrusion. This is an excellent solution for parking structures, bridges, and traffic decks.