94% Undensified Microsilica (Silica Fume) 94U
94% Undensified Silica Fume (94U) is a highly effective supplementary cementitious material derived from the byproduct of silicon and ferrosilicon alloy production. It contains approximately 94% amorphous silica (SiO2) and possesses exceptional physical and chemical properties that make it a valuable addition to various construction materials, especially concrete and cement-based products.
With a low bulk density ranging from 250 to 350 kg/m3, 94% Undensified Silica Fume is lightweight and easy to handle, resulting in reduced transportation costs. Its specific surface area, typically between 15,000 and 30,000 m2/kg, allows for a high pozzolanic reactivity that enhances the mechanical and durability properties of the final products.
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Features
- Increased compressive and flexural strength
- Reduced permeability and water ingress
- Enhanced resistance to chemical attack and abrasion
- Improved long-term performance and durability
- Lightweight and easy to handle
- Cost-effective and environmentally friendly
Application
- High-performance concrete (HPC)
- Precast and prestressed concrete elements
- Shotcrete for tunnel linings and slope stabilization
- Self-compacting concrete (SCC)
- Fiber-reinforced concrete (FRC)
- Repair and rehabilitation of damaged structures
- Oil well cementing and grouting
- Refractory materials for high-temperature applications
- High-quality ceramics, coatings, and polymers
- Green and sustainable building materials
Parameters
| Property | Value |
|---|---|
| SiO2 (Silicon Dioxide, Amorphous) | 94% min |
| Al2O3 (Aluminum Oxide) | Typical 0.55% |
| Fe2O3 (Iron Oxide) | Typical 0.16% |
| CaO (Calcium Oxide) | Typical 0.38% |
| MgO (Magnesium Oxide) | Typical 0.58% |
| K2O (Potassium Oxide) | Typical 1.24% |
| Na2O (Sodium Oxide) | Typical 0.29% |
| LOI (Loss on Ignition) | 4% max |
| Moisture | 3% max, Typical 0.52% |
| Retained on 45 micron sieve | 10% max, Typical 1.03% |
| Bulk Density | 250-350 kg/m3 |
| pH | 6-8 |
| Fluidity | > 18 cm |
| Specific surface (BET) | 18 m2/gram min |
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Founded in 2001, HSA is a leading provider of Silica Fume and Abrasives in China, and also the premium source of high-performance Products for concrete and abrasives industries.