Carbonation, movement or poor construction can cause dangerous cracks in concrete structures, leading to the appearance of leaks and water penetration. Resin injection is designed to inject and seal the cracks that appear in reinforced concrete.
There are two main materials that we use for resin injection leak sealing:
Epoxy resin is a recommended material for the structural repair method of concrete cracks as it has a low viscosity and strong adhesion to concrete, effectively filling cracks and voids to provide a waterproof seal and cease water penetration. This method also helps restore the original strength to the concrete and seals in the reinforcing, preventing further damage.
We also use polyurethane-based injection resins to fill cracks and voids with high water ingress. This solution can halt the flow of liquid in a quick fashion, forming a robust seal and stopping further damage and water ingress. The low viscosity of this material allows excellent penetration of the surface, achieving a durable elastic seal.
To begin the process of resin injection, surface preparation is paramount. We use specialist cleaning techniques and air to remove contaminants from the surface before resin is introduced to the structure through specially-prepared inlet ports or drilled holes.
A polyurethane resin would be recommended if the concern was to stop water leakage, with foam being used in the instance where material may leak out of the back of the crack. This material is ideal in these instances due to its immediate hardening properties when coming into contact with water.
Where structural repair is paramount and the area must be as strong as the concrete being repaired then we would use epoxy resin due to its high tensile strength, although this material comes with a longer cure time.
Resin injection repair is often part of a complete concrete repair system, including waterproofing and crack repair. At CSC Services we provide repairs services and protective coatings to structures across the UK water sector, in nuclear power stations, public sector buildings (such as hospitals and prison buildings) and across UK infrastructure including bridges, tunnels, culverts and sewers.
Structures that we are experienced in working with for leak sealing include:
We will first assess the area to be sealed using specialist techniques including pressure-injected materials, before recommending a system of products and application processes to fix the crack/leak with an effective yet value result. Our teams all carry CSCS cards, EUSR Water cards, DOMS, Confined Space Certificates and are BSVR (baseline security vetting register) and CTC (counter terrorism check) vetted as a minimum.
The following video shows the process being carried out to waterproof a basement structure and you can view a recent case study for Cemex on Resin Injection: