Injection is a procedure of pumping cement-based, polyurethane-based, epoxy-based or acrylate-based material into damaged or cracked structures to securely seal leaks, repair compromised structures and make them watertight again for the long term.
Full Range of Injection Solutions for Construction & Repair
Advantages of Sika Injection Solutions
Effectiveness
- Injections can permanently seal even the smallest cracks and voids, providing a comprehensive waterproofing solution
Compatibility
- Compatible with Sika’s complete engineered waterproofing systems
Full range
- Includes all material technologies
- Covers almost all applications
- Provides efficient application equipment
Durability
- High-quality injection materials
- Provide long-lasting waterproofing protection
- Enhance the lifespan of structures
Sika Provides Various Injection Materials
Polyurethane foaming resins are designed to expand with water to temporarily block the passage of water through the crack or void. Their fast expansive reaction with water forms a tough and flexible elastic foam. For permanent waterproofing, these polyurethane foaming resins are re-injected with a suitable non-foaming injection resin, usually also based on polyurethane.
Polyurethane resins are hydrophobic, flexible and used for non-structural injection sealing and waterproofing voids, cracks and joints. Their low viscosity allows good penetration into the concrete structure to seal leaks and achieve a durable elastic seal. Polyurethane resins seal with very strong edge adhesion to concrete and have hydrophobic characteristics. In voids, cracks and joints with high water ingress, pre-injection as temporary water stopping with a polyurethane foaming resin is required.
Acrylate resins are hydrophilic, very flexible and used for non-structural injection of cracks, joints and voids, including injection hose systems, compartment systems and area injections (e.g. grid and curtain). During application, acrylate resins have extremely low viscosity (similar to water) and therefore have ideal penetration abilities. Their reaction or hardening time is also adjustable, which allows flexibility to adapt the injection material to the prevailing conditions on site (temperature and injection distance, for example). Acrylate resin based materials seal and waterproof leaks through their hydrophilic swelling behavior in contact with water. The injection equipment is also easily cleaned with water.
Epoxy resins have relatively high tensile and compressive strengths in relation to concrete. They are generally regarded as ‘rigid’ materials and are widely used for structural repairs by injecting cracks and voids in load-bearing reinforced concrete structures or elements. Their low viscosity allows excellent penetration into cracks and strong adhesion to concrete, which helps to ensure permanent and durable load transfer. Epoxy resin based materials are suitable for many different structural
injection requirements and applications in dry to slightly damp conditions.
