Silicon oxide powder CAS code 69012-64-2 is also known as silica fume, microsilica, or pyrogenic silica. It is a fine, white powder that is produced as a by-product of the production of silicon metal or ferrosilicon alloys. Silica fume is primarily composed of amorphous silicon dioxide (SiO2), but it also contains small amounts of carbon and trace elements.
Silica fume is a highly reactive material that has a number of unique properties. It is very small, with particle sizes ranging from 0.01 to 0.1 micrometers. This makes it very effective for filling in voids and pores in concrete and other materials. Silica fume is also very strong and durable, and it can improve the compressive strength, flexural strength, and abrasion resistance of concrete.
Silicon Oxide Powder Parameter
| Parameter | Typical Range/Value |
|---|---|
| Chemical Composition | Silicon Dioxide (SiO2): >85% |
| Particle Size | 0.1 – 0.3 μm |
| Surface Area | >20,000 m²/kg |
| Bulk Density | 200 – 700 kg/m³ |
| Color | Gray to off-white |
| Purity | High purity with minimal impurities |
| Amorphous Structure | Amorphous (non-crystalline) |
| Surface Reactivity | High reactivity due to small size |
| Pozzolanic Activity | Enhances concrete strength/durability |
| Dosage | Typically 5% – 10% by weight in concrete |
Silica fume is used in a variety of applications
1.Water Resources and Hydropower Engineering
When used in water conservancy projects, it can improve the anti-crack performance of hydraulic concrete cracks. In the anti-seepage and anti-abrasion parts, after adding microsilica powder, it can greatly improve the anti-seepage, anti-abrasion, crack resistance and cavitation resistance. performance.
2.Making high-strength concrete
Silica fume plays a great role as an admixture in making high-strength concrete. The bonding strength between the paste and the aggregate can play a very good role in its hardening function. In practical applications, its strength level can reach 100Mpa. .
3. Harbor engineering
Adding silica fume to concrete can increase the anti-penetration, salt corrosion and abrasion resistance of the material. It can improve the anti-abrasion and anti-permeability properties of concrete, prevent electrochemical corrosion of steel bars, and resist 48m/s flow rate level. Abrasion resistance can be improved by more than 3 times.
4. Traffic engineering
Silica fume concrete has strong wear-resistant properties and is used in highway pavements and airport runways. It can greatly improve the early strength and wear-resistant properties of concrete. In the maintenance and repair of highway pavements, it can advance the opening time to traffic and increase economic benefits.
5. Shotcrete
Significantly improves the adhesion and cohesion of plastic concrete, greatly reduces the amount of rebound and increases the thickness of shotcrete in one go, shortening the construction period and saving project costs.
6. Other uses
It can be used in the fertilizer industry as an anti-caking agent, as a raw material for silicate bricks, in the production of water glass, and as a reinforcing material for organic compounds. Its composition is similar to that of silica produced by the gas phase method. It can be used as filler in rubber resin, paint, coating, unsaturated polyester and other polymer materials. Reinforcement materials.
Silica fume is a valuable material with a wide range of applications. It is important to note that silica fume can be a respiratory hazard if inhaled, so it is important to take appropriate precautions when handling and using this material.
