Expansive Agent CSA (Calcium Sulfoaluminate)
CAS Number: 65997-16-2
Calcium sulfoaluminate (CSA)-based expansive agent compensates for concrete shrinkage by generating controlled expansion through ettringite formation during cement hydration. Used at 6–12% replacement of cement, it is widely applied in compensating-shrinkage concrete, self-stressing concrete, and crack-resistant structures such as water tanks and basement walls. Compliant with ASTM C845 and Chinese GB/T 23439.
Technical Specifications
| pH | 11.0-13.0 |
| appearance | Grey fine powder |
| expansive ratio (%) | 0.02–0.06 (in water) |
| free lime content (%) | ≤1.0 |
| fineness (% passing 80 μm) | ≥85 |
Applications
- Water tanks, reservoirs, and basement waterproofing
- Compensating-shrinkage concrete slabs and floors
- Post-tensioned slab construction
- Grouting applications requiring controlled expansion
- Self-stressing concrete pipes and pressure vessels
Key Features
- Effectively compensates drying and autogenous shrinkage
- Generates controlled expansion through stable ettringite formation
- Compatible with PCE superplasticizers and fiber reinforcement
- Meets ASTM C845 and GB/T 23439 international standards
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