Products > Mining Solutions > Shotcretes
MACT Shotcrete-SF (Silica-Free High Performance Shotcrete)
Target Audience: Mine Managers, Safety Officers, Tunnel Engineers, Project Managers prioritizing worker health and safety without compromising ground support performance.
High-Performance, Silica-Free Shotcrete for Safer Underground Environments - Exceeds 40 MPa Strength
Overview
MACT Shotcrete-SF is a state-of-the-art, pre-packaged shotcrete engineered to deliver high-performance ground support (>40 MPa) while virtually eliminating the risk associated with respirable crystalline silica (<0.1% RCS). This innovative, shrinkage-reduced formulation provides excellent sprayability (wet or dry process), low rebound, and durable support comparable to traditional silica-based mixes. By prioritizing worker safety without sacrificing structural integrity, Shotcrete-SF is the responsible choice for modern mining and tunnelling operations, particularly in confined spaces.
Key Technical Advantages
- Enhanced Worker Safety: Contains <0.1% crystalline silica, drastically reducing silicosis risk and simplifying dust control measures.
- High Strength & Durability: Achieves >40 MPa compressive strength, providing robust and reliable ground support.
- Shrinkage Reduced: Minimizes potential for cracking, ensuring long-term liner integrity.
- Excellent Application: Designed for efficient wet or dry spray application with low rebound, optimizing material usage.
- Consistent Quality: Pre-blended formulation guarantees reliable performance and adherence to specifications.
- Versatile Support: Suitable for primary/secondary support, shaft lining, and structural repairs.
Performance Data (Typical Values)
| Property | Standard | Value |
|---|---|---|
| Compressive Strength (1d) | ASTM C109 / AS 1012.9 | [Specify Value based on TDS] MPa |
| Compressive Strength (7d) | ASTM C109 / AS 1012.9 | > 25 MPa |
| Compressive Strength (28d) | ASTM C109 / AS 1012.9 | > 40 MPa |
| Flexural Strength (28d) | ASTM C78 / AS 1012.11 | [Specify Value based on TDS] MPa |
| Bond Strength (Pull-off, 28d) | ASTM C1583 / EN 1542 | [Specify Value based on TDS] MPa (Substrate dependent) |
| Drying Shrinkage (28d) | AS 1012.13 | < [Specify Value, e.g., 800] microstrain (Reduced) |
| Respirable Crystalline Silica (RCS) | AS 2985 / NIOSH 7500 | < 0.1% |
| Rebound (Typical) | Application Dependent | < 15% (Wet), < 25% (Dry) |
| Set Time (Vicat Needle) | AS 2350.13 | Approx. [Specify Value] hours @ 20°C (Can be accelerated) |
| Water Demand (Dry Spray) | N/A | Approx. [Specify Value] L/bag |
| Yield (per 20kg bag) | N/A | Approx. [Specify Value] Litres |
| Density (Wet) | N/A | Approx. [Specify Value] kg/m³ |
Note: Performance data is indicative and subject to variation based on water content, accelerator dosage, ambient temperature, and application technique. Refer to the official MACT Shotcrete-SF Technical Data Sheet (TDS) for detailed specifications, testing conditions, and performance curves.
Application Parameters
| Parameter | Value |
|---|---|
| Water Content (Wet Mix) | [Specify W/C Ratio or Slump Target] |
| Water Addition (Dry Mix @ Nozzle) | Operator Controlled (Typical [Value] L/min) |
| Accelerator Dosage (if used) | [Specify % by weight of cement] (Consult TDS) |
| Mixing Time (Wet Mix) | Approx. 3-5 minutes (Pan/Truck Mixer) |
| Pumping Distance | [Specify Max Recommended Distance] |
| Substrate Temperature | 5°C - 35°C |
| Ambient Temperature | 5°C - 35°C |
| Recommended Equipment | Standard Wet/Dry Shotcrete Pumps, Nozzles, Mixers |
Primary Applications
- Ground support in underground mines and tunnels, especially where ventilation is limited.
- Shaft linings.
- Slope stabilization.
- Structural repairs where silica dust generation is a concern.
- Projects requiring compliance with stringent occupational health and safety standards.
Compliance
Formulated to meet performance requirements of relevant shotcrete standards (e.g., EFNARC, AS equivalents) while significantly exceeding silica safety regulations.
Packaging & Logistics
Supplied as a powder in 20kg moisture-resistant bags or bulk bags. Contact MACT for delivery options and lead times across Australia.
Next Steps
- Download the full Technical Data Sheet (TDS) (Placeholder Link)
- Request a Safety Data Sheet (SDS) (Placeholder Link)
- Contact a MACT technical representative