Nano Silica Concrete Densifier & Strength Enhancer
CAS Number: 7631-86-9
Colloidal nano silica is an ultra-fine amorphous silicon dioxide suspension with particle sizes of 5–100 nm, providing a pozzolanic reactivity many times greater than microsilica. At dosages of 1–5% by cement weight, it dramatically accelerates early strength development, refines pore structure, reduces permeability, and improves the ITZ (interfacial transition zone) bond between cement paste and aggregates. It is used in ultra-high-performance concrete (UHPC) and demanding infrastructure applications.
Technical Specifications
| pH | 9.5-11.5 |
| appearance | White to opalescent colloidal dispersion |
| SiO2 content (%) | 40±2 |
| particle size (nm) | 10–20 |
| specific surface area (m²/g) | ≥200 |
Applications
- Ultra-high-performance concrete (UHPC) formulations
- High-strength precast concrete elements
- Concrete structures requiring minimal permeability
- Shotcrete for underground reinforcement
- Concrete repair in aggressive chemical environments
Key Features
- Particle size 100–1000x finer than silica fume for maximum pore filling
- Accelerates early strength gain by nucleation seeding effect
- Dramatically improves ITZ and aggregate-paste bond strength
- Stable colloidal form ensures homogeneous distribution in concrete
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