Silica Fume Powder in Construction
In construction, silica fume powder is used as a supplementary cementitious material to improve the strength, durability, and other properties of concrete. It is typically added to concrete mixtures in small amounts, usually between 5% and 10% by weight of cement, to achieve the desired properties.
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Description
Silica fume is a byproduct of the production of silicon metal and ferrosilicon alloys. It is also known as microsilica, condensed silica fume, or simply as fume. It is a very fine powder composed mostly of amorphous silica, with some minor impurities. Silica fume is a highly reactive pozzolan, which means that it reacts chemically with calcium hydroxide in cement to form additional calcium silicate hydrates, the primary binding agent in concrete.
The use of silica fume in concrete has several benefits, including:
Increased strength: The pozzolanic reaction between silica fume and cement produces additional calcium silicate hydrates, which increase the strength of concrete.
Improved durability: The fine particles of silica fume fill the voids between cement particles, resulting in a denser, more impermeable concrete that is less susceptible to water and chemical penetration.
Reduced permeability: The use of silica fume in concrete can reduce the permeability of the concrete, which can help to prevent the penetration of water and other liquids that can cause damage.
Enhanced workability: The addition of silica fume can improve the workability of concrete, making it easier to place, compact, and finish.
Specification
| Property/Characteristic | Description |
|---|---|
| Chemical Composition | Amorphous silicon dioxide (SiO2) with trace amounts of other minerals |
| Particle Size Range | 0.1 - 5.0 microns |
| Specific Surface Area | 15,000 - 30,000 m2/kg |
| Bulk Density | 200 - 600 kg/m3 |
| Color | Grey to black |
| pH | 6 - 7 |
| Water Absorption | < 2% |
| Chloride Content | < 0.01% |
| Loss on Ignition | < 5% |
| Reactivity | High reactivity with cement and water |
| Pozzolanic Activity | High pozzolanic activity, which means it reacts with calcium hydroxide (a byproduct of cement hydration) to form additional cementitious compounds |
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