Description of micro silica powder micro silica powder is a dust collecting powder in metal smelting process, that is, by-products are also called fly ash or silica fume. Due to the characteristics of volcanic ash and relatively high activity, the fineness is measured in micron order. The...Send InquiryChat Now
Description of micro silica powder
micro silica powder is a dust collecting powder in metal smelting process, that is, by-products are also called fly ash or silica fume. Due to the characteristics of volcanic ash and relatively high activity, the fineness is measured in micron order.
The fineness of micro silica powder is less than 1um, accounting for more than 80%, the average particle size is 0.1-0.3um, and the specific surface area is 20~28m2. /g. Its fineness and specific surface area are about 80 to 100 times that of cement and 50 to 70 times that of fly ash. And the refractoriness is >1600 °C. Volume weight: 1600~1700kg/m3.
In the formation process of micro silica powder, due to the surface tension in the process of phase transformation, amorphous spherical granules of amorphous phase are formed, and the surface is relatively smooth, and some are agglomerates in which a plurality of spherical particles are bonded together. It is a volcanic ash substance with a large specific surface area and high activity. A material containing silica fume, a tiny spheroid can act as a lubricant.
Due to the use of micro silica powder in the process, the main role is to reduce water, enhance, increase body density, increase the flexural and compressive strength, thereby greatly improving the service life of the product material and acid and alkali corrosion, and reducing the amount of cement added. . Silica fume has many advantages and properties, so it is widely used in refractory materials, ceramics, rubber, cement, concrete, grouting, exterior wall insulation, mortar and road and bridge industries. In the process of using silica fume, the color of silica fume can be used according to the appearance color of the product.
The effects of micro silica powder
micro silica powder can fill the pores between the cement particles, and at the same time form a gel with the hydration product and react with the alkaline material magnesia to form a gel.
In cement-based concrete, mortar and refractory castables, the addition of an appropriate amount of micro silica powder can play the following role: <br/> 1. Significantly improve the compression, flexural, impermeability, corrosion resistance, Impact and wear resistance. The following information should be noted for the raw materials selected for mass concrete: 1. The coarse aggregate should be continuously graded, and the fine aggregate should be medium sand. The admixture should preferably be a retarder or a water reducing agent; the admixture should preferably be fly ash or slag powder. Cement should use cement with low hydration heat and long setting time. It is preferred to use medium heat Portland cement, low heat slag Portland cement, dam cement, slag Portland cement, fly ash Portland cement, volcanic ash. Portland cement and so on. This bleeding phenomenon.
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