Repair Systems — 02 — Concrete & Structural Defects
Epoxy repair mortars
Technical product reference for 2-part and 3-part epoxy repair mortars for concrete spalling repair in carparks, vehicle ramps, and chemically exposed areas. Covers chemical resistance, early strength, thin-section application, and brand comparisons across Ardex, Sika, and Fosroc.
What are epoxy repair mortars?
Epoxy repair mortars are 2-part or 3-part systems combining an epoxy resin, a hardener, and a graded aggregate filler. Unlike cementitious and polymer-modified mortars that cure through hydration, epoxy mortars cure through a chemical cross-linking reaction — producing a rigid, high-strength, chemical-resistant repair with very low porosity. They are used specifically where chemical resistance, high early strength, thin-section capability, or heavy load resistance is required.
Product Reference
Individual products — one card each — scroll to view all
Sika Australia
Sikadur-41 CF Normal
Three-part thixotropic structural epoxy repair mortar
Sikadur-41 CF Normal is a three-part, solvent-free, thixotropic structural epoxy repair mortar (~70 MPa at 7 days @23 °C) for non-sag patch repair on vertical and overhead surfaces. Supplied as a pre-proportioned kit with ~30 min pot life at 23 °C; applied to a dry, prepared substrate.
Fosroc / Parchem
Fosroc Nitomortar 903
Solvent-free epoxy binder + fillers — high-strength epoxy mortar/screed
Fosroc Nitomortar 903 is a solvent-free epoxy resin binder system combined with selected fillers and aggregates to produce epoxy mortars / screeds of various consistencies, achieving up to 90 MPa compressive strength depending on the mix. Applied to a dry, prepared substrate. CONFIRM pot life, non-sag capability and pack sizes against the current Fosroc / Parchem TDS.
Fosroc / Parchem
Fosroc Nitomortar AP
Two-component epoxy paste — patching, bonding and anchoring
Fosroc Nitomortar AP is a two-component epoxy paste (69 MPa @28d, 30–60 min pot life) for patching repairs to concrete, bonding precast components, setting starter bars / dowels, general anchoring, and as the adhesive for the Nitofill LV crack-injection system — where strength, water impermeability and chemical resistance are essential. Applied to a dry, prepared substrate.
System Comparison
Epoxy repair mortars — confirm all selections against the current manufacturer TDS before specifying.
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Do not confuse epoxy repair mortars with:
- Polymer-modified cementitious repair mortars — cementitious binder with polymer — standard choice for most concrete spalling repair — lower cost and simpler application — listed on the polymer-modified repair mortars page
- Epoxy crack injection resins — low-viscosity liquid epoxy resins for injection into cracks — not mortars — listed under concrete cracking product categories
- Epoxy anchoring adhesives — cartridge-dispensed epoxy for fixing bolts and anchors into concrete — not structural repair mortars
- Epoxy floor coatings and sealers — thin-film epoxy coatings applied over sound concrete — protective surface systems, not structural repair materials
- Structural grouts — epoxy or cementitious grouts for filling voids under baseplates or around prestress tendons — different product class from repair mortars
Disclaimer
This page provides general technical information only. Final product selection must be confirmed against the current manufacturer TDS, project specification, substrate condition, and exposure classification. Do not rely on this reference as a substitute for professional engineering or remedial building consultant advice.