Definition
Resin injection is a repair method used to fill cracks, voids, and defects within concrete by injecting specialised resin materials under pressure. The objective may be structural bonding, water sealing, or void stabilisation depending on the resin type.
Explanation
The most common systems include epoxy resin injection and polyurethane resin injection. Epoxy resins are typically used for structural crack repair where bond strength and load transfer must be restored. Polyurethane resins are commonly used for active water ingress, as they can expand and create flexible waterproof seals.
The process involves identifying crack patterns, installing injection ports, sealing the crack face, and injecting the selected resin at controlled pressure. Proper diagnosis is critical because the wrong resin can result in ineffective repairs or recurring defects.
Resin injection is frequently used in basements, retaining walls, slabs, tunnels, and reinforced concrete frames where access is limited and full breakout is not practical.
Why It Matters
Resin injection provides targeted, minimally invasive repair for cracks and leakage. Correct specification improves durability, prevents further deterioration, and can avoid more disruptive structural intervention later.