Shrinkage Reducing Admixture (SRA)
CAS Number: 57-55-6
Shrinkage Reducing Admixture (SRA) is a propylene glycol derivative liquid admixture that reduces the surface tension of pore water in hardened concrete, thereby significantly decreasing capillary stress and drying shrinkage. At typical dosages of 1–3% by weight of cement, SRA can reduce drying shrinkage by 25–50% compared to the control mix, mitigating cracking in industrial slabs, bridge decks, and pavements. The product is chloride-free and compatible with PCE superplasticizers and all standard admixture systems.
Technical Specifications
| pH | 6.0–8.0 |
| Appearance | Clear colorless to slightly hazy liquid |
| Solid Content | ≥98% |
| Specific Gravity | 1.03–1.05 |
| Recommended Dosage | 1.0–3.0% bwc |
Applications
- Industrial and warehouse concrete floors to control plastic and drying shrinkage cracking
- Bridge decks and parking structure slabs exposed to chloride environments
- Post-tensioned slabs prone to restraint cracking
- Concrete pavements requiring tight dimensional tolerance
- High-performance concrete with low water-cement ratio
Key Features
- SRA reduces drying shrinkage by 25–50% by lowering pore water surface tension
- Prevents plastic shrinkage and drying shrinkage cracking in large flat slabs
- Chloride-free formula compatible with reinforced and post-tensioned concrete
- Synergistic with PCE superplasticizers for high-performance low-water-cement-ratio mixes
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CAS Number
57-55-6
Category
Specialty Concrete AdmixturesAvailability
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