Epoxy Grouting
& Injection Services
High-quality epoxy injection and grouting solutions in Sri Lanka — restoring full structural integrity to cracked concrete beams, columns, slabs and walls. Stronger than the original concrete. Trusted by government, healthcare and infrastructure projects island-wide.
Epoxy Grouting & Injection —
Restoring Concrete to Full Strength
Discover high-quality epoxy injection and grouting solutions in Sri Lanka. Epoxy injection is the definitive method for structurally repairing dry cracks in concrete — bonding the crack faces together with an adhesive stronger than the original concrete to fully restore load-bearing capacity.
Unlike polyurethane (PU) injection which produces a flexible foam seal, epoxy resin cures to form an extremely strong, rigid bond between the two faces of a concrete crack. The tensile strength of cured epoxy resin — typically exceeding 50–70 MPa — is significantly higher than that of concrete itself. This means epoxy injection does not simply seal a crack but actually makes the repaired section structurally stronger than it was before cracking.
Epoxy grouting uses the same high-strength resin in a thicker formulation — suitable for filling wider gaps, voids, bolt holes and gaps beneath machinery base plates or precast elements where a non-shrink, high-strength structural fill is required. Both systems are applied using specialist injection pumps to ensure the resin penetrates fully through the depth of the element being repaired.
Epoxy Injection vs
Epoxy Grouting — What's the Difference?
Why Epoxy Makes Concrete
Stronger Than Before
The counterintuitive truth about epoxy injection is that it does not merely repair concrete to its original condition — it makes the repaired section significantly stronger. This is because epoxy resin has a tensile bond strength of 50–70 MPa, whereas structural concrete typically has a tensile strength of only 2–5 MPa.
When epoxy is injected into a crack and allowed to cure under pressure, it forms a molecular bond with the concrete on both crack faces — creating a composite material that is stronger in tension than the surrounding concrete. The repaired crack will not re-open at the same location; if the structure is overloaded, a new crack will form adjacent to the repair rather than through it.
- Epoxy tensile strength: 50–70 MPa vs concrete tensile strength: 2–5 MPa
- Full structural monolithic bond — not just a surface seal
- Compressive strength exceeding 80 MPa — higher than most structural concrete grades
- Bond strength to concrete substrate typically exceeds concrete's own cohesive strength
- No shrinkage on curing — maintains full contact and bond across the entire crack face
- Chemical resistance — unaffected by moisture, chlorides and most industrial chemicals
Where Epoxy Injection
& Grouting Is Used
The Epoxy Injection
Process — Step by Step
Choosing the Right Epoxy
Viscosity for Your Crack
Epoxy resins are available in a range of viscosities — from ultra-low-viscosity water-thin systems for hairline cracks to high-viscosity pastes for wide gaps. Correct selection is critical for full crack penetration and performance.
Water-thin resin for hairline cracks. Penetrates deeply through capillary action and injection pressure — ideal for fine cracks in beams and slabs.
General-purpose injection resin for most structural crack repair applications — the most commonly used system for beams, columns and walls.
Thick epoxy grout for wide gaps, voids and base plate grouting. Non-shrink, zero slump — remains in position without formwork for most applications.
Epoxy or PU Injection —
Choosing the Right System
| Criteria | 🔵 Epoxy Injection | 💉 PU Grouting |
|---|---|---|
| Primary purpose | Structural restoration | Water sealing |
| Crack condition required | Dry | Wet or active leak |
| Cured material | Rigid — high strength bond | Flexible foam |
| Structural load capacity | ✓ Fully restored | ✗ Not applicable |
| Movement joints | ✗ Not suitable | ✓ Ideal |
| Tensile bond strength | 50–70 MPa | Low — foam bond |
| Min crack width | 0.1mm | 0.3mm+ |
More Injection &
Grouting Solutions
Epoxy Grouting & Injection FAQs
Is Your Concrete Structurally Cracked?
Our certified specialist will assess your cracks and specify the right injection system — free site visit, no obligation.