Epoxy injection is an economical method for repairing immobile cracks in walls, slabs, columns and concrete pillars and is able to restore concrete to its pre-cracked strength. Before making any injection, it is necessary to determine the cause of the crack. Pressure epoxy injection can be used to bond cracks that have an opening greater than or equal to 0.05 mm. This method is not applicable if the crack is active, the cracks are large in number or when water leakage cannot be controlled.
If the cause of the cracking has not been corrected, it will reoccur near the original crack. Great care must be taken when injecting cracks that are not visible on all surfaces. Epoxy injections are designed and used to restore the strength and integrity of structural elements in cracked concrete. But these cracks must be relatively dry for the epoxy to achieve adhesion.
After all, epoxy injections will not shift or react with water. Therefore, they are ineffective in waterproofing a leaky crack. Resin injection is based on repairing cracked or delaminated concrete and for sealing cracks in concrete to prevent water leakage. Two basic types of resins and injection techniques are used to repair concrete; epoxy resins and polyurethane resins.
Epoxy resins cure to form solids with a high strength and a relatively high modulus of elasticity. Connect the mouthpiece to the second tea port and begin the injection until the surgical tube expands and fills. The epoxy injection method is an easy way to repair cracks in a structure and works great for horizontal, vertical and overhead applications. The type of injection resin you will need varies depending on the depth of the structural cracks, as well as whether or not it is a crack on the blind side.
The epoxy injection process begins with the application of a coating paste, which serves to seal the surface of the crack and help bond the injection ports to the concrete. There are some methods that inspectors can use to verify that the epoxy injection process has been effective and is sufficient to repair structural damage. Verification that the epoxy is completely insensitive to water should be done by injecting the test epoxy into the pre-moistened cracks, and then evaluating the core sample of the cured epoxy injected into the crack. Consequently, epoxy injection means applying an adhesive material (epoxy resin) to a concrete body under pressure to repair its crack.
Epoxy resins that are labeled as water insensitive during curing can develop milky white bond lines if injected into wet or damp cracks. Once the capping paste is used, the ports are drilled or installed, and any loose materials and dust are removed from the cracks, epoxy injection can begin. This observation window can be used as viewpoints during the injection process to examine the flow of epoxy resin through the crack. All injection products have the disadvantage of being somewhat unpredictable, because both hole drilling and material injection are done blindly.
At the same time, leave a gap of 25 to 50 mm at a distance interval of approximately 200 to 250 mm for the epoxy injection installation system according to the general rule of the same. Epoxy and other resins lose strength when exposed to fire or sustained elevated temperatures and flame retardant protection is required for such structural repairs. Typically, the epoxy injection system contains a kit that has two chemicals and uses those two chemicals by mixing them thoroughly according to company specifications. .