what's Micro Silica? Micro Silicon Powder used?
Micro silica is silicon alloy and silicon smelting generated when SiO2 and Si gas and oxygen within the air and condensatidirectly to shapethe rapid oxidation of a good silica powder.
First, micro-physical and chemical properties of silica fume:
1, micro silica fume: the semblance of gray or white powder, refractoriness> 1600 ℃. Bulk density: 200 ~ 250 kg / cubic meter.
2, the fineness of micro-silica: silica fume within the fineness of not up to oneμm, greater than 80% of the typical particle size of 0.1 ~ 0.3μm,Ray Ban RB2140 Polarized Black Wayfarer Sunglasses, expresssurface area: 20 ~ 28m2 / g. The fineness and expresssurface area of about 80 to ten0 times of cement, fly ash, 50 to 70 times.
3, particle morphology and mineralogical structure: the shapeation means of silica fume, as a result of the approach to phase transitions by surface tension effect, the shapeation of amorphous non-crystalline phase without spherical particles and the outside is smooth, at the same time asothers are more round spherical particle aggregates keep on withgether. this is a big surface area, active topash material. fabricsmixed with fine silicon powder, tiny spherical body can play the role of lubrication.
Second, role: micro silica powder to fill the pores between cement particles, hydration products and in addition generate gel, magnesium oxide reacts with the alkaline material gel. within the cement base of concrete,Ray Ban RB3387 Black Frame Dark Green Lens Sunglasses, mortar and castable refractory, mixed with appropriate quantityof silica fume, can play the next roles:
1, significantly improve the compressive, flexural, impermeability, corrosion, impact resistance and wear resistance.
2, with water to preventsegregation, bleeding, significantly reduced the role of the resistance of concrete pumping.
3,Ray Ban RB3404 Black Frame Dark Green Lens Polarized Sunglasses, significantly extending the service lifetime of concrete. Especially within the erosion of chloride contamination, sulfate attack, tophumidity and other harsh environment, the durabilityof concrete can double and even several times.
4, an indicationificant reduction in spraying concrete and castable floor dust,Ray Ban RB2140 Black Wayfarer Sunglasses, increase the thickness of a single spray.
5, is an essential part of topstrength concrete were C150 concrete engineering applications.
6, with about fivetimes the effect of cement, concrete and within the general application of low cement castables can lessencosts. to decoratedurability.
7, effectively save youthe occurrence of alkali-aggregate reaction of concrete.
8,Ray Ban RB2140 Sunglasses- Floral Frame, increase the density of casting refractories. Coexist with Al2O3, the much more doubtlessgenerated mullite, its toptemperature strength, enhanced thermal vibration.
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