Set Accelerator for Sprayed Concrete (Shotcrete)
CAS Number: 7784-24-9
Alkali-free liquid set accelerator for sprayed concrete (shotcrete) provides rapid setting and early strength development immediately after spray application, enabling the construction of thicker layers without sloughing and minimizing rebound. Unlike traditional alkali-based accelerators, alkali-free formulations preserve long-term strength and do not cause flash set problems. Compliant with EN 934-5 for shotcrete admixtures, with dosage typically 4–8% by cement weight.
Technical Specifications
| pH | 2.5-4.5 |
| appearance | Clear to slightly hazy liquid |
| specific gravity | 1.30–1.35 |
| active content (%) | 40±5 |
| alkali content as Na2O equivalent (%) | ≤1.0 |
Applications
- Tunnel lining and underground excavation support
- Slope protection and rock face stabilization
- Mine roof support and reinforcement
- Repair of concrete structures using wet shotcrete
- Emergency repair where instant set is required
Key Features
- Alkali-free formula preserves long-term strength (no strength loss after 28d)
- Rapid initial set (< 3 min) and early strength for thick-layer application
- Low rebound compared to dry-process and alkali-based accelerators
- Compliant with EN 934-5 and Swiss SIA 162/5 specifications
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