Crack injection resins are products used at a structural level to repair and restore damaged concrete structures. There are two main types of resins used for this purpose: polyurethane resins and epoxy resins, designated under EN 1504-5 (F1) as force-transmitting crack-filling products.
Epoxy-based resins are rigid products with high mechanical strength, making them ideal for structural repairs in concrete structures. They are highly durable and, after curing, resistant to water and chemicals; however, they do not offer the best compatibility for application in contact with water.
Polyurethane-based resins are products that can be rigid or flexible and provide good adhesion to dry, damp or wet concrete, including where there is pressurised water ingress, making them ideal for repairing cracks in infrastructure such as dams, basements, excavations, etc. They have a high capacity to seal cracks and pressurised water paths and also offer high chemical resistance. In our range, this product family has a 1:1 mixing ratio throughout.
In summary, crack injection resins are an effective and cost-efficient solution for sealing and restoring damaged concrete structures. The choice between polyurethane-based resins and epoxy resins will depend on the specific requirements of each case and its defects, such as the type of structure, its strength, its condition in relation to water, etc.