What is Silica Fume?
Keywords
Silica fume, microsilica, amorphous silica, concrete admixtures, building materials
CAS number 69012-64-2
EINECS number 273-761-1
Microsilica is a large amount of highly volatile SiO2 and Si gases produced in ferroalloys during the smelting of ferrosilicon and industrial silicon. The gases are rapidly oxidized, condensed and precipitated with the air after being discharged. It is an industrial waste. However, microsilica fume has good functionality when used as a concrete admixture. It can fill the pores between cement particles and improve the rheological properties of concrete. At the same time, it forms a gel with the alkaline material magnesium oxide and hydration products, which can Significantly improves the material's compression resistance, flexural resistance, impermeability, anti-corrosion, impact resistance and wear resistance, and has a significant volcanic ash effect.
Silica Fume is an amorphous polymorph of silicon dioxide, silica. It is an ultrafine powder collected as a by-product of the silicon and ferrosilicon alloy production and consists of spherical particles.
Application is as pozzolanic material for high performance concrete.
