Product Facts
- Product Name
- Conbextra HES - High Early Strength Cementitious Grout
- Price
- Available
- Availability
- In Stock
- Condition
- New
- Category
- Construction Materials > Grouting Products
- Seller
- Fosroc Workspace
- MPN
- FC501060-20KG
Conbextra HES - High Early Strength Cementitious Grout
Conbextra HES is a shrinkage compensated cementitious grout used for free flow grouting in a wide range of applications where rapid strength gain is a pre-requisite. Achieves 25 MPa compressive strength at 2 hours when mixed at flowable consistency. Ideal for grouting machine bases where quick return to service is required. Features rapid strength gain, excellent flow retention, shrinkage compensation, high ultimate strength, low permeability, and is chloride free. Suitable for pumping or pouring.
Conbextra HES is a shrinkage compensated cementitious grout used for free flow grouting in a wide range of applications where rapid strength gain is a pre-requisite. Achieves 25 MPa compressive strength at 2 hours when mixed at flowable consistency. Ideal for grouting machine bases where quick return to service is required. Features rapid strength gain, excellent flow retention, shrinkage compensation, high ultimate strength, low permeability, and is chloride free. Suitable for pumping or pouring.
Price: Available
Brand: Fosroc
Product Data (OpenAI Spec)
View Full JSON Spec ↗Specifications
| Condition | new |
|---|---|
| Category | Construction Materials > Grouting Products |
Product Intelligence
Conbextra HES: High Early Strength Cementitious Grout
Overview
Conbextra HES is a rapid-set, high-strength cementitious grout supplied as a ready-to-use powder specifically formulated for free-flow grouting applications. The product is engineered to deliver rapid strength gain, making it ideal for applications where early strength development and quick project progression are essential.
Key Features and Advantages
Strength and Performance
- Rapid strength gain facilitates rapid installation and operation of plant within a matter of hours
- High strength gain achievable even at low temperatures, providing reliable performance across varying climate conditions
- High ultimate strength and low permeability ensure durability of the hardened grout
- Excellent initial flow and flow retention across a wide range of application consistencies and temperatures
- Non-shrink classification according to ASTM C1107:2020
Product Characteristics
- Supplied as a ready-to-use dry powder requiring only the addition of controlled amounts of clean water
- Contains a unique system compensating for shrinkage in the hardened state through controlled expansion via additives
- Chloride free composition eliminates corrosion risk
- RCS (Respirable Crystalline Silica) Hazard Free – contains <0.1% RCS in accordance with Australian Inventory of Industrial Chemicals
- Suitable for pumping or pouring over a large range of application consistencies and temperatures
- Maximum aggregate size of 5.0mm minimizes segregation and bleeding
Composition and Properties
Material Composition
Conbextra HES is a blend of:
- Cements (primary component)
- Graded aggregates
- Additives that impart controlled expansion in hardened state (Class C classification)
The aggregate grading is specifically designed to minimize segregation and bleeding across different application consistencies.
Technical Specifications
Compressive Strength Performance
Testing conducted according to AS 1478.2:2005 at standard curing temperatures shows progressive strength development:
| Consistency | 2 Hours | 4 Hours | 8 Hours | 24 Hours | 28 Days |
|---|---|---|---|---|---|
| Plastic | 30 MPa | 35 MPa | 40 MPa | 42 MPa | 58 MPa |
| Flowable | 25 MPa | 30 MPa | 35 MPa | 37 MPa | 50 MPa |
Additional testing per ASTM C109:2020b (at water addition of 2.3L per 20kg):
- 1 day: 45.6 N/mm²
- 3 days: 48.3 N/mm²
- 7 days: 58.1 N/mm²
- 28 days: 71.6 N/mm²
Other Mechanical Properties
| Property | Standard | Result |
|---|---|---|
| Modulus of Elasticity | AS 1012.17:2000 | 23.4 GPa (at 3 hours) |
| Flexural Strength | AS 1012.11:2000 | 3.0 MPa (1 day), 4.5 MPa (7 days), 6.5 MPa (28 days) |
| Indirect Tensile Strength | AS 1012.10:2000 | 1.5 MPa (1 day), 2.5 MPa (7 days), 3.0 MPa (28 days) |
| Fresh Wet Density | ASTM C185:2020 | 2250 kg/m³ (depending on consistency) |
| Flow Characteristics | AS 1478.2:2005 | 350mm (Flow Trough) |
Setting and Flow Properties (ASTM C1107:2020)
| Property | Standard | Result |
|---|---|---|
| Flow Consistency | ASTM C839:2016a | 121% |
| Initial Setting Time | ASTM C953:2017 | 30 minutes |
| Final Setting Time | ASTM C953:2017 | 45 minutes |
| Volume Change (Early Age) | ASTM C827:2016 | +0.30% |
| Height Change (Hardened Grout, Moist Cure) | ASTM C1090:2015 | +0.14% to +0.18% across 1-28 days |
Application Thickness Range
- Minimum thickness: 15mm
- Maximum thickness: 150mm in a single pour
Packaging and Supply
Conbextra HES is supplied in 20kg moisture-resistant plastic bags. The moisture-resistant packaging facilitates convenient handling and storage on construction sites while protecting product integrity.
Product Code: FC501060-20KG
Yield Per 20kg Bag
| Consistency | Yield (Litres of Mixed Material) |
|---|---|
| Plastic | 10.0 litres |
| Flowable | 10.2 litres |
Primary Applications
Conbextra HES is specifically designed for:
- Free-flow grouting in applications requiring rapid strength gain
- Foundation grouting where early strength development is critical
- Underplate grouting for machine base plates and structural elements
- Applications where rapid installation and quick project progression are important considerations
Storage and Shelf Life
- Shelf life: 18 months from date of manufacture
- Storage condition: Keep in original, unopened bags
- Caution: Do not use if lumps are present or if loss of workability is experienced (indicated by requirement for additional water)
Safety and Documentation
A Safety Data Sheet (SDS) is available from the Fosroc website and should be read carefully prior to use. In case of emergency within Australia, contact the Poisons Information Centre at phone 13 11 26.
References
- [1] Fosroc_Conbextra_HES_TDS.pdf
- [2] Fosroc_Conbextra_GP_TDS.pdf
- [6] Fosroc_Conbextra_HS_TDS.pdf