Metakaolin Pozzolanic Additive
CAS Number: 92704-41-1
Metakaolin is a highly reactive pozzolan produced by calcination of kaolin clay at 600–800°C, removing chemically bound water to create a highly disordered alumino-silicate phase. Used at 5–20% replacement of cement, it rapidly reacts with calcium hydroxide to produce dense, low-permeability concrete with high early strength. Metakaolin also reduces concrete efflorescence and is favored in white and architectural concrete.
Technical Specifications
| appearance | White to off-white fine powder |
| whiteness (%) | ≥80 |
| Al2O3 + SiO2 (%) | ≥90 |
| reactivity index 28d (%) | ≥100 |
| specific surface area (m²/kg) | ≥12000 |
Applications
- Architectural and white concrete requiring low efflorescence
- High-performance concrete with rapid strength development
- Geopolymer binder systems
- Repair mortars requiring high early strength
- Waterproofing mortars and waterproof renders
Key Features
- Highly reactive pozzolan with faster reactivity than silica fume at early age
- Reduces efflorescence and improves surface appearance
- White color suitable for architectural and decorative concrete
- Compliant with ASTM C618 and EN 450 requirements
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