Viscosity Modifying Agent for Self-Compacting Concrete
CAS Number: 9004-32-4
Viscosity modifying agent (VMA) is a water-soluble polymer admixture that increases the viscosity and cohesion of self-compacting concrete (SCC) mixes, preventing segregation and bleeding while maintaining high flowability. Typically used in combination with PCE superplasticizers to achieve the required SCC rheological properties: high flowability (slump flow 550–800 mm) with adequate viscosity (T500 ≤ 5 s) and segregation resistance. Cellulose ether and welan gum grades are most common.
Technical Specifications
| appearance | White to off-white powder |
| pH (1% solution) | 6.0-8.0 |
| solid content (%) | 97±2 |
| moisture content (%) | ≤8 |
| viscosity grade (mPa·s, 2%, 20°C) | 15000–60000 |
Applications
- Self-compacting concrete (SCC) for congested reinforcement
- Underwater concrete and tremie pour applications
- High-fluidity concrete for complex formwork
- Precast SCC elements for architectural applications
- High-volume pumped concrete requiring anti-segregation
Key Features
- Prevents segregation and bleeding in high-fluidity SCC mixes
- Compatible with PCE superplasticizers for balanced SCC performance
- Low dosage (0.01–0.05% by cement weight) avoids workability loss
- Available in cellulose ether and biopolymer grades for different mix designs
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