Repair Systems
Concrete Repair Mortars
Polymer-modified cementitious repair mortars are the primary system for concrete patch repair in Australian remedial building practice. This reference covers system selection, technical requirements, product comparisons, and Australian Standards notes for Class 2 building applications.
What is polymer-modified repair mortar?
Polymer-modified repair mortars are cementitious repair materials enhanced with polymer additives (typically styrene-butadiene, acrylic, or epoxy) to improve bond strength, flexibility, durability, and resistance to chloride ingress and carbonation. They are the primary system for concrete patch repair in Australian remedial practice and are specified for structural and non-structural concrete reinstatement following spalling, delamination, corrosion-related breakout, and physical damage.
Product Reference
Use the TDS link for verified specifications before specifying on any project.
ARDEX BR 345
Best for: High-build structural patch repair on vertical, horizontal, and overhead concrete — façades, balcony soffits, columns, and beams where a single lift up to 80 mm is required.
Typical Applications
- Concrete spall repair on vertical and overhead surfaces
- Balcony soffit and column reinstatement
- Single-lift repairs from 10 mm to 80 mm depth
- Façade substrate preparation prior to coating
- Structural reinstatement after reinforcement corrosion breakout
Coverage Rate
12.6 litres per 20 kg bag — approximately 1.25 m² at 10 mm thickness
Prices indicative only — verify with retailer before purchasing or use in any cost estimate.
Advantages
- Up to 80 mm in a single lift — vertical, overhead, and horizontal
- Built-in active corrosion inhibitor — high resistivity formulation
- MICROTEC® fibre reinforcement reduces early shrinkage cracking
- Shrinkage compensated — dimensionally stable after cure
- 30–45 MPa compressive strength — structural reinstatement capability
- Pot life of 30–45 minutes at 23°C — manageable for site conditions
Limitations
- Requires compatible ARDEX bonding primer — do not apply to dry or contaminated substrate
- Not suitable as a standalone waterproofing system
- Colour match to existing concrete cannot be guaranteed
- Verify current TDS before specifying — product formulations may be updated
Technical Specifications
Indicative Price
~$77–$83 per 20 kg bag
Indicative online range only. Prices vary by supplier, region, and order volume. Verify with supplier prior to use in any cost estimate.
Manufacturer / Official
Standards & Notes
AS 3600 exposure classification compliance should be verified by the specifying consultant. Aligned with EN 1504-3 structural repair mortar principles — confirm classification and performance class on current ARDEX Australia TDS.
Product data sourced from ARDEX Australia official product page and spec sheet. Always obtain and verify the current Technical Data Sheet from ardexaustralia.com before specifying or applying.
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. Prices shown are indicative online ranges only — verify with suppliers before use in any cost estimate or tender document. Do not rely on this reference as a substitute for professional engineering advice.
Concrete & Structural Defects
Identify defect types, causes, and appropriate repair pathways before selecting a repair mortar system.
Corrosion Inhibitors
Migrating and barrier inhibitor systems — typically specified alongside repair mortar for reinforcement corrosion.
Generate a Scope of Works
Use the AI Scope Builder to assemble a remedial scope using the repair systems and defects identified.