Repair Systems — 02 — Concrete & Structural Defects
Cementitious repair mortars
Technical product reference for cementitious repair mortars for concrete spalling repair in Australian Class 2 strata, carparks and civil structures — general-use and rapid-set grades with SBR bonding coat. Covers product selection, setting time differences, and brand comparisons across Sika, Ardex, Fosroc and Mapei.
What are cementitious repair mortars?
Cementitious repair mortars are cement-based patch repair materials with limited or no added polymer — they rely primarily on the cementitious binder for strength and adhesion. Compared to fully polymer-modified systems, they are generally lower in cost and have higher porosity. In Australian remedial building practice, cementitious repair mortars are used where the exposure classification and project budget do not justify a fully polymer-modified system, or where a rapid-setting formulation is required for fast-track programme works.
Product Reference
Individual products — one card each — scroll to view all
Sika Australia
Sika MonoTop-412 NFG
R4 fibre-reinforced structural repair mortar with corrosion inhibitor
Sika MonoTop-412 NFG is a one-component, polymer-modified, fibre-reinforced, low-shrinkage cementitious structural repair mortar (EN 1504-3 R4) with an integral corrosion inhibitor, for hand and trowel patch repair of spalled and cracked concrete on vertical and overhead surfaces. A 20 kg bag yields ~11 L of mortar. R4 implies a ≥45 MPa minimum; CONFIRM the tested @28d compressive strength and maximum layer thickness against the current Sika Australia TDS.
Sika Australia
Sika MonoTop-352 NFG
R3 fibre-reinforced lightweight hand-applied repair mortar
Sika MonoTop-352 NFG is a one-component, polymer-modified, fibre-reinforced, lightweight low-shrinkage cementitious repair mortar (EN 1504-3 R3) with an integral corrosion inhibitor, for general hand and trowel patch repair on vertical and overhead surfaces. A 20 kg bag yields ~12.8 L of mortar. R3 implies a ≥25 MPa minimum; CONFIRM the tested @28d compressive strength and maximum layer thickness against the current Sika Australia TDS.
Mapei Australia
Mapei Mapegrout T60
R4 sulphate-resistant fibre-reinforced thixotropic repair mortar
Mapei Mapegrout T60 is a one-component, sulphate-resistant, fibre-reinforced thixotropic cementitious structural repair mortar (EN 1504-3 R4) for hand-applied reinstatement on vertical and overhead surfaces, placed to 40 mm in a single coat (multi-coat for thicker builds), supplied in 25 kg bags. R4 implies a ≥45 MPa minimum; CONFIRM the tested @28d compressive strength against the current Mapei Australia TDS.
Mapei Australia
Mapei Mapegrout T40
R3 thixotropic fibre-reinforced cementitious repair mortar (40 MPa)
Mapei Mapegrout T40 is a thixotropic, fibre-reinforced cementitious repair mortar (EN 1504-3 R3, ~40 MPa) for hand-applied repair of vertical and overhead concrete up to 30–35 mm per coat, supplied in 25 kg bags. Confirm the primer/SSD requirement, exact layer limits and rebar-protection compatibility from the current Mapei Australia TDS.
System Comparison
Concrete spalling — confirm all selections against the current manufacturer TDS before specifying.
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Do not confuse cementitious repair mortars with:
- Polymer-modified repair mortars — higher polymer content for better adhesion, crack resistance, and lower porosity — preferred for exposed and higher-exposure applications — listed on the polymer-modified repair mortars page
- Epoxy repair mortars — 2-part or 3-part epoxy-aggregate systems for chemical-resistant, thin-section, or high-load applications — different curing mechanism — listed on the epoxy repair mortars page
- Sand-cement mortar (site-batched) — do not use plain site-batched sand and cement as a structural repair mortar — must use a pre-bagged product with polymer modification and EN 1504-3 rating for structural applications
- Tile adhesives and bedding compounds — polymer-modified cementitious tile adhesives (e.g. Mapei Keraflex, ARDEX X 77) are bonding systems for tiles only — not suitable for use as concrete repair mortars
Disclaimer
This page provides general technical information only. Final product selection must be confirmed against the current manufacturer technical data sheet, project specification, substrate condition, exposure classification, AS 3600 requirements, and applicator warranty conditions. Do not rely on this reference as a substitute for professional engineering or remedial building consultant advice.