Silica Fume (Microsilica) Pozzolanic Additive
CAS Number: 69012-64-2
Silica fume (microsilica) is an ultra-fine by-product of silicon metal production, consisting primarily of amorphous silicon dioxide with particle sizes 100x finer than cement. As a pozzolanic additive at 5–10% replacement of cement, it reacts with calcium hydroxide to form additional calcium silicate hydrate, dramatically densifying the concrete microstructure, increasing strength, and reducing permeability. It is essential in high-performance and ultra-high-performance concrete.
Technical Specifications
| appearance | Light grey to dark grey ultra-fine powder |
| SiO2 content (%) | ≥85 |
| moisture content (%) | ≤3 |
| pozzolanic activity index (%) | ≥105 |
| specific surface area (m²/kg) | ≥15000 |
Applications
- High-strength and ultra-high-strength concrete (>80 MPa)
- Marine and aggressive environment concrete
- Bridge decks and infrastructure requiring low permeability
- Shotcrete for tunnels and slope protection
- Abrasion-resistant industrial floor overlays
Key Features
- Ultra-fine particles fill cement paste pores for maximum densification
- Pozzolanic reaction converts weak Ca(OH)2 to strong CSH
- Dramatically reduces chloride ion diffusivity for corrosion protection
- Compliant with ASTM C1240 and EN 13263 standards
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