Repair Systems
Cement & aggregates
General Purpose (GP) Portland cement — technical reference for concrete spalling in Australian remedial building practice. Covers system selection, product comparisons, and brand equivalents.
What is cement & aggregates?
Portland cement, clean washed sand, and graded coarse aggregate are the fundamental raw materials for site-batched concrete and repair mortars used in remedial works where pre-bagged proprietary products are not specified or where large volumes make site batching more economical. Mix design — cement-to-aggregate ratios, water-to-cement ratio, and aggregate grading — must be controlled by an experienced operator to achieve the required compressive strength and minimise shrinkage cracking; poor proportioning affects all performance properties. Portland cement should comply with AS 3972 Type GP and aggregates with AS 2758.1 for cleanliness, particle shape, and grading. Site-batched mixes are commonly used for void-filling, large encasement pours, concrete slabs, and screed beds where the volume is too large for pre-bagged products. The water-to-cement ratio is the single most important variable — excess mix water causes reduced strength, increased shrinkage, and reduced durability.
Product Reference
Scroll right to see all brands. Use each card's TDS link for verified specifications before specifying on any project.
System Description
Used in site-batched mortar mixes. Do not use alone for structural repairs. Add polymer admix.
Technical Properties
- Available through general builders suppliers — cost-effective for large-volume fills
- Can be custom-batched on site to meet specific mix design requirements
Limitations
- Mix quality is entirely operator-dependent — poor proportioning affects all properties
- Shrinkage must be managed through correct w/c ratio — excess water causes cracking
PROCUREMENT SOURCES
System Description
Used in site-batched mortar mixes. Do not use alone for structural repairs. Add polymer admix.
Technical Properties
- Available through general builders suppliers — cost-effective for large-volume fills
- Can be custom-batched on site to meet specific mix design requirements
Limitations
- Mix quality is entirely operator-dependent — poor proportioning affects all properties
- Shrinkage must be managed through correct w/c ratio — excess water causes cracking
PROCUREMENT SOURCES
System Description
Used in site-batched mortar mixes. Do not use alone for structural repairs. Add polymer admix.
Technical Properties
- Available through general builders suppliers — cost-effective for large-volume fills
- Can be custom-batched on site to meet specific mix design requirements
Limitations
- Mix quality is entirely operator-dependent — poor proportioning affects all properties
- Shrinkage must be managed through correct w/c ratio — excess water causes cracking
PROCUREMENT SOURCES
System Description
Used in site-batched mortar mixes. Do not use alone for structural repairs. Add polymer admix.
Technical Properties
- Available through general builders suppliers — cost-effective for large-volume fills
- Can be custom-batched on site to meet specific mix design requirements
Limitations
- Mix quality is entirely operator-dependent — poor proportioning affects all properties
- Shrinkage must be managed through correct w/c ratio — excess water causes cracking
PROCUREMENT SOURCES
System Description
Used in site-batched mortar mixes. Do not use alone for structural repairs. Add polymer admix.
Technical Properties
- Available through general builders suppliers — cost-effective for large-volume fills
- Can be custom-batched on site to meet specific mix design requirements
Limitations
- Mix quality is entirely operator-dependent — poor proportioning affects all properties
- Shrinkage must be managed through correct w/c ratio — excess water causes cracking
PROCUREMENT SOURCES
System Description
To AS 2758.1. Max 4.75 mm particle size. Must be clean, salt-free, no organic matter.
Technical Properties
- Available through general builders suppliers — cost-effective for large-volume fills
- Can be custom-batched on site to meet specific mix design requirements
Limitations
- Mix quality is entirely operator-dependent — poor proportioning affects all properties
- Shrinkage must be managed through correct w/c ratio — excess water causes cracking
PROCUREMENT SOURCES
System Description
To AS 2758.1. Max 4.75 mm particle size. Must be clean, salt-free, no organic matter.
Technical Properties
- Available through general builders suppliers — cost-effective for large-volume fills
- Can be custom-batched on site to meet specific mix design requirements
Limitations
- Mix quality is entirely operator-dependent — poor proportioning affects all properties
- Shrinkage must be managed through correct w/c ratio — excess water causes cracking
PROCUREMENT SOURCES
System Description
To AS 2758.1. Max 4.75 mm particle size. Must be clean, salt-free, no organic matter.
Technical Properties
- Available through general builders suppliers — cost-effective for large-volume fills
- Can be custom-batched on site to meet specific mix design requirements
Limitations
- Mix quality is entirely operator-dependent — poor proportioning affects all properties
- Shrinkage must be managed through correct w/c ratio — excess water causes cracking
PROCUREMENT SOURCES
System Description
To AS 2758.1. Max 4.75 mm particle size. Must be clean, salt-free, no organic matter.
Technical Properties
- Available through general builders suppliers — cost-effective for large-volume fills
- Can be custom-batched on site to meet specific mix design requirements
Limitations
- Mix quality is entirely operator-dependent — poor proportioning affects all properties
- Shrinkage must be managed through correct w/c ratio — excess water causes cracking
PROCUREMENT SOURCES
System Description
To AS 2758.1. Max 4.75 mm particle size. Must be clean, salt-free, no organic matter.
Technical Properties
- Available through general builders suppliers — cost-effective for large-volume fills
- Can be custom-batched on site to meet specific mix design requirements
Limitations
- Mix quality is entirely operator-dependent — poor proportioning affects all properties
- Shrinkage must be managed through correct w/c ratio — excess water causes cracking
PROCUREMENT SOURCES
System Description
To AS 2758.1. Washed, graded 10 mm nominal. For site-mixed encasement or patch concrete.
Technical Properties
- Available through general builders suppliers — cost-effective for large-volume fills
- Can be custom-batched on site to meet specific mix design requirements
Limitations
- Mix quality is entirely operator-dependent — poor proportioning affects all properties
- Shrinkage must be managed through correct w/c ratio — excess water causes cracking
PROCUREMENT SOURCES
System Description
To AS 2758.1. Washed, graded 10 mm nominal. For site-mixed encasement or patch concrete.
Technical Properties
- Available through general builders suppliers — cost-effective for large-volume fills
- Can be custom-batched on site to meet specific mix design requirements
Limitations
- Mix quality is entirely operator-dependent — poor proportioning affects all properties
- Shrinkage must be managed through correct w/c ratio — excess water causes cracking
PROCUREMENT SOURCES
System Description
To AS 2758.1. Washed, graded 10 mm nominal. For site-mixed encasement or patch concrete.
Technical Properties
- Available through general builders suppliers — cost-effective for large-volume fills
- Can be custom-batched on site to meet specific mix design requirements
Limitations
- Mix quality is entirely operator-dependent — poor proportioning affects all properties
- Shrinkage must be managed through correct w/c ratio — excess water causes cracking
PROCUREMENT SOURCES
System Description
To AS 2758.1. Washed, graded 10 mm nominal. For site-mixed encasement or patch concrete.
Technical Properties
- Available through general builders suppliers — cost-effective for large-volume fills
- Can be custom-batched on site to meet specific mix design requirements
Limitations
- Mix quality is entirely operator-dependent — poor proportioning affects all properties
- Shrinkage must be managed through correct w/c ratio — excess water causes cracking
PROCUREMENT SOURCES
System Description
To AS 2758.1. Washed, graded 10 mm nominal. For site-mixed encasement or patch concrete.
Technical Properties
- Available through general builders suppliers — cost-effective for large-volume fills
- Can be custom-batched on site to meet specific mix design requirements
Limitations
- Mix quality is entirely operator-dependent — poor proportioning affects all properties
- Shrinkage must be managed through correct w/c ratio — excess water causes cracking
PROCUREMENT SOURCES
Brand Equivalents
Side-by-side view of equivalent products across all major brands.
| Material | Ardex | Sika | Fosroc | Tremco / Other | Parchem / Mapei |
|---|---|---|---|---|---|
| Portland cement | Boral GP Cement | Hanson OPC | Cockburn Cement | Cement Australia GP | Independent Cement & Lime |
| Sand (washed river sand) | Boral Washed River Sand | Hanson Washed River Sand | Independent Quarry | Quarry Direct | Local quarry |
| Coarse aggregate (10 mm) | Boral 10 mm Crushed Rock | Hanson 10 mm Aggregate | Independent Quarry | Quarry Direct | Local quarry |
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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