FIXMATE is a product in order to repair the crack gap and micro-cracks that occur in the concrete structure. Inside the product, there is a disc-shaped container which has elasticity. This container is ballooned up when the epoxy resin is injected, and then surplus epoxy resin is injected until that fills the micro-crack gap. A balloon-shaped epoxy resin storage device is designed to injected the epoxy resin at a constant force to deep inside of a micro-crack. Specially fabricated backflow prevention valve is capable quickly and safely construction because it perfectly prevents reverse flow when injecting the epoxy resin to the balloon.