Repair Systems
Repair mortars (polymer-modified)
Polymer-modified structural repair mortar — technical reference for reinforcement corrosion in Australian remedial building practice. Covers system selection, product comparisons, and brand equivalents.
What is repair mortars (polymer-modified)?
Polymer-modified repair mortars are cementitious products containing styrene-butadiene rubber (SBR) or acrylic polymers, used to reinstate concrete that has been removed due to spalling, delamination, or corrosion-induced cover loss. They are the default repair material for concrete spall repairs on Class 2 apartment buildings, carparks, and civil structures where spalled cover is cut back to clean, sound concrete and the area is reinstated to profile. The polymer component significantly improves bond strength, flexibility, and durability over straight cement mortar, and most products comply with EN 1504-3 Class R3/R4 requirements adopted in Australian practice. Applied by trowel or spray in layers up to 30–50 mm, with a bond coat primer applied to the prepared substrate immediately before placement. A bonding agent or primer coat is essential; without it, premature delamination is common.
Product Reference
Scroll right to see all brands. Use each card's TDS link for verified specifications before specifying on any project.
System Description
Encapsulate rebar after priming. Build out in layers max 30 mm. Cure minimum 7 days. Low permeability critical.
Technical Properties
- Bond to existing concrete typically >2.0 MPa pull-off strength when correctly prepared
- Polymer modification improves flexibility and freeze-thaw resistance over plain cement mortar
- Suitable for structural and cosmetic repairs, 5–100 mm depth range
Limitations
- Colour match to existing concrete is not guaranteed without specialist colour service
- Requires minimum CSP 3–4 surface preparation — bond will fail on unprepared surfaces
PROCUREMENT SOURCES
System Description
Encapsulate rebar after priming. Build out in layers max 30 mm. Cure minimum 7 days. Low permeability critical.
Technical Properties
- MicroTec micro-fibre technology integrated into the mix — reduced bond coat requirement on sound concrete
- High-build to 50 mm in a single pass — reduces number of layers on medium to large spalls
- EN 1504-3 R3 performance with >2.0 MPa pull-off bond strength
- Stocked by Bldcare, Komerco, and Waterproofing Direct for online ordering
Limitations
- Higher cost per bag than standard polymer-modified grades
- Substrate and ambient temperature minimum 5°C — cold weather delays cure
- Not suitable for feathered edges or thin cosmetic profiling — use Ardex Feather Finish for sections below 5 mm
PROCUREMENT SOURCES
System Description
Encapsulate rebar after priming. Build out in layers max 30 mm. Cure minimum 7 days. Low permeability critical.
Technical Properties
- Bond to existing concrete typically >2.0 MPa pull-off strength when correctly prepared
- Polymer modification improves flexibility and freeze-thaw resistance over plain cement mortar
- Suitable for structural and cosmetic repairs, 5–100 mm depth range
Limitations
- Colour match to existing concrete is not guaranteed without specialist colour service
- Requires minimum CSP 3–4 surface preparation — bond will fail on unprepared surfaces
PROCUREMENT SOURCES
System Description
Encapsulate rebar after priming. Build out in layers max 30 mm. Cure minimum 7 days. Low permeability critical.
Technical Properties
- Bond to existing concrete typically >2.0 MPa pull-off strength when correctly prepared
- Polymer modification improves flexibility and freeze-thaw resistance over plain cement mortar
- Suitable for structural and cosmetic repairs, 5–100 mm depth range
Limitations
- Colour match to existing concrete is not guaranteed without specialist colour service
- Requires minimum CSP 3–4 surface preparation — bond will fail on unprepared surfaces
PROCUREMENT SOURCES
Tremco Eucocrete HBM
polymer-modified structural repair mortar, 25 kg bag
System Description
Encapsulate rebar after priming. Build out in layers max 30 mm. Cure minimum 7 days. Low permeability critical.
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 |
|---|---|---|---|---|---|
| Concrete repair mortar (polymer-modified) | Ardex BR 340 | Sika MonoTop-612 / MonoTop-620 | Fosroc Renderoc HB / Renderoc LA | Tremco Eucocrete HBM | Mapei Mapegrout SHB |
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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