Repair Systems
Epoxy repair mortars
2-part / 3-part epoxy repair mortar — technical reference for concrete spalling in Australian remedial building practice. Covers system selection, product comparisons, and brand equivalents.
What is epoxy repair mortars?
Epoxy repair mortars are two- or three-component systems (resin, hardener, and dry filler aggregate) used where high compressive strength, early return to service, or chemical resistance is required beyond what cementitious products can deliver. Specified for industrial floors, loading dock edges, trafficked ramps, precast nibs, and structural repairs where thin-section placement or rapid strength gain is critical — typically trafficable within 2–4 hours. The epoxy binder provides bond strengths and compressive strengths significantly higher than cementitious alternatives and resists oils, solvents, and abrasive wear. Application requires careful component mixing ratios and temperature management; the system is rigid when cured, which can cause stress at the repair perimeter if thermal movement is not accounted for. Typically installed by specialist concrete repair contractors.
Product Reference
Scroll right to see all brands. Use each card's TDS link for verified specifications before specifying on any project.
System Description
Use where high early strength or chemical resistance required. Max layer 10 mm. Priming essential.
Technical Properties
- Sikadur-42 is an EN 1504-6 precision epoxy grout — specified for structural baseplate grouting, starter bars, and heavy-duty floor patches
- High load-bearing capacity — designed for machine bases, column baseplates, and structural connection grouting
- Pre-packaged component pails provide consistent mix ratio — reduces field measurement error
- Available through Bldcare and Waterproofing Direct
Limitations
- Not a surface cosmetic repair product — strictly for structural applications requiring EN 1504-6 precision grout performance
- Temperature-sensitive: below 10°C curing slows significantly; above 30°C pot life drops below 15 min
- Incompatible with SBR bond coats — epoxy primer required on substrate
PROCUREMENT SOURCES
System Description
Use where high early strength or chemical resistance required. Max layer 10 mm. Priming essential.
Technical Properties
- Multi-purpose 2-part epoxy adhesive and repair mortar — structural performance in thin sections from 3 mm
- High compressive and bond strength — epoxy matrix achieves >50 MPa compressive, >3.5 MPa pull-off bond
- Rapid strength gain — trafficable surface typically within 4–6 hours at 20°C
- Chemical resistance to oils, fuels, and cleaning agents — suited to loading areas, plant rooms, and car parks
Limitations
- Rigid when cured — thermal expansion mismatch with surrounding concrete; edge cracking risk on large repair areas
- Short pot life after mixing — must be placed and finished within 20–40 min at 20°C
- Higher material cost than cementitious alternatives — specify only where early strength or chemical resistance justifies epoxy
PROCUREMENT SOURCES
System Description
Use where high early strength or chemical resistance required. Max layer 10 mm. Priming essential.
Technical Properties
- EN 1504-3 R4 — highest structural classification epoxy mortar for industrial floors, loading docks, and ramps
- Exceptional compressive strength typically >80 MPa at 28 days — exceeds most concrete substrates
- High abrasion and impact resistance — suited to surfaces subject to wheeled loads and forklift traffic
- Three-component system provides consistent aggregate loading and mix ratio
Limitations
- Highest material cost per square metre in the repair mortar category — warranted only by R4 performance requirements
- Rigid system — stress concentration at repair perimeter; engineer must design joint or tapered edges for large repairs
- Requires specialist applicator — correct aggregate blending, mixing, and compaction is critical to rated performance
PROCUREMENT SOURCES
System Description
Use where high early strength or chemical resistance required. Max layer 10 mm. Priming essential.
Technical Properties
- All-purpose 3-part structural epoxy repair mortar from the Fosroc Nitomortar range — confirmed current Australian product
- High compressive strength from epoxy binder — structural performance for heavily loaded repair zones
- Suitable for concrete reinstatement, floor joint edges, industrial floor repairs, and machine bases
- Available via Parchem Construction Supplies (Fosroc distributor in Australia)
Limitations
- Short working time at temperatures above 25°C — component pre-staging and organised placement sequence mandatory
- Rigid epoxy binder — not suitable for joints subject to ongoing movement
- Confirm current product name, batch size, and supply lead time with Fosroc/Parchem before specifying
PROCUREMENT SOURCES
Tremco Eucocrete HBM
polymer-modified structural repair mortar, 25 kg bag
System Description
Use where high early strength or chemical resistance required. Max layer 10 mm. Priming essential.
Technical Properties
- Polymer-modified structural repair mortar from the Tremco CPG Eucocrete concrete repair system
- Suitable for structural spall reinstatement and substrate rebuilding on horizontal and vertical faces
- Compatible with Tremco CPG corrosion protection primers and system components
Limitations
- Tremco distribution network is smaller than Sika or Fosroc — confirm local availability with Tremco CPG Australia before specifying
- Confirm current product name, specification, and EN 1504-3 compliance class with Tremco representative before specifying
- Standard polymer-modified cementitious shrinkage risk — wet curing regime required
PROCUREMENT SOURCES
Brand Equivalents
Side-by-side view of equivalent products across all major brands.
| Material | Ardex | Sika | Fosroc | Tremco / Other | Parchem / Mapei |
|---|---|---|---|---|---|
| Epoxy repair mortar | Ardex RA 88 Plus | Sika Sikadur-42 / Sika MonoTop Epoxy | Fosroc Nitomortar 50 | Tremco Eucocrete HBM | Fosroc Nitomortar AP |
Disclaimer
Information is general only. Product selection must be confirmed against project requirements, substrate condition, exposure class, manufacturer technical data sheets, NCC requirements, Australian Standards (including AS 3600), and consultant or structural engineer specifications. Do not rely on this reference as a substitute for professional engineering advice.
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