Introduction of silicon powder

Silicon powder also called micro silicon powder, the scientific name of silica fume, is an industrial electric furnace in high-temperature smelting industrial silicon and ferrosilicon, with the exhaust gas escape of dust by a unique collection device collection and treatment. The content of SiO2 in the escaped dust accounts for about 90% of the total dust; the particle size is tiny, and the average particle size is nano-level, so it is called silica powder. Durability affects frost resistance: when the dosage of silica powder is small, the frost resistance of silica powder concrete is the same as that of ordinary concrete; when silica powder is more than 15%, its frost resistance is poor. Through a large number of tests, this view has been confirmed. The main reason is that when the silica powder exceeds 15%, the substantial expansion increases, the relative dynamic elastic modulus decreases, and the compressive strength drops sharply. The specific surface area is small from the internal characteristics of concrete, and the spacing coefficient is significant. Impermeability: Because the silica powder particles are small, 20 ~ 100 times smaller than the cement particles, they can be filled into the gap between the cement particles so that the concrete is dense. At the same time, the secondary hydration of the silica powder and the new products block the permeability channel in the concrete, so the permeability of the silica powder concrete is extreme, and the permeability of the concrete increases with the increase of the water-binder ratio. This is because water cement could be better in compactness than concrete. Chemical erosion resistance: The incorporation of silica powder in concrete can reduce the content of Ca (OH) 2, increase the compactness of concrete, and effectively improve the corrosion ability of weak acid, but not in solid acid or high depth of weak acid, because of the decomposition of CSH in concrete in acid, in addition, it can also resist salt corrosion, especially for chlorine salts and sulfates, the reason why it can resist acid corrosion, The reason is that silica concrete is dense, the pore structure is improved, thus reducing the harmful ion transfer rate and the generation of soluble Ca (OH) 2 and ettringite (3CaO·Al2O3·3CaSO4 ·32H2), and increasing the result of calcium silicate hydrate crystal. If you are looking for high quality, high purity and cost-effective Silicon powder, or if you require the latest price of Silicon powder, please feel free to email contact mis-asia.