What is the goal of crack injection in concrete structures?

The goal of crack injection in concrete structures is to seal cracks to prevent water and other harmful substances from entering, thereby stopping further deterioration and restoring structural integrity. Injecting cracks with materials like epoxy or polyurethane fills the voids, creating a barrier against moisture, chlorides, and other aggressive agents that can cause corrosion of reinforcing steel or freeze-thaw damage. In some cases, crack injection can also restore some of the structural capacity by bonding the cracked sections back together. The choice of injection material depends on the crack width, the purpose of the repair, and the environmental conditions. Effective crack injection requires proper surface preparation, selection of the appropriate injection material, and careful application techniques to ensure complete filling of the crack.