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Concrete Epoxy and Grout Injection
Concrete epoxy and grout injections are repair techniques we use to fix cracks, voids, and structural deficiencies in concrete structures, which are common in parking garages as well as stadiums. Epoxy injections involve injecting a specially formulated epoxy resin into cracks, which creates a durable bond that restores the integrity of the concrete. This method is effective in preventing further crack propagation and provides added strength to the repaired area. Grout injections involve injecting a cementitious mixture into larger voids or spaces. This helps fill gaps, improve stability, and provide additional structural support. Both epoxy and grout injections are important to correctly repair concrete in many cases as they offer efficient solutions to restore structural integrity, prevent further water damage, and extend the lifespan of the concrete. We use these techniques all the time to provide cost effective and proactive concrete repair solutions for our clients.
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Choosing between them
The short version is that epoxy is structural and grout is not. Epoxy welds a crack back together and restores the concrete’s ability to carry load across it, which is what you want when the crack is not going to move again. Where a crack is still moving, or where the problem is water rather than strength, a flexible or chemical grout that fills and seals is the better answer. Getting that choice wrong is how a repair fails twice, and it is one of the things we settle during an assessment.
Filling voids
Grout injection also fills the voids you cannot see: gaps under slabs, spaces behind walls, and honeycombing left from the original pour. Those voids are where water collects and where settlement starts, and filling them is usually cheaper than what happens if they are left alone.
Questions we get asked
Epoxy or grout injection. How do you decide?
Epoxy is the more structural of the two. We use it on cracks from initial settling, initial shrinkage or damage, where the crack is not going to keep moving. Chemical grout is for dynamic cracks with water intrusion issues, where the job is to stop the water and the corrosion that comes with it. If the crack is still moving, grout is usually the answer.
Are the two ever used together?
Yes. Injection and carbon fiber get used in tandem, as a belt and suspenders approach, sometimes with stitching to mitigate the movement itself. Sealing the crack and holding it still are two different jobs, and some repairs need both.
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