Winitoor Micro silica fume for concrete for cement

 Silica fume, also known as microsilica, (CAS number 69012-64-2, EINECS number 273-761-1) is an amorphous (non-crystalline) 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 with an average particle diameter of 150 nm. The main field of application is as pozzalanic material for high performance cement concrete.

Properties

 Silica fume is an ultrafine material with spherical particles less than 1 μm in diameter, the average being about 0.15 μm. This makes it approximately 100 times smaller than the average cement particle. The bulk density of silica fume depends on the degree of densification in the silo and varies from 130 (undensified) to 600 kg/m³.The specific gravity of silica fume is generally in the range of 2.2 to 2.3. The specific surface area of silica fume can be measured with the BET method or nitrogen adsorption method. It typically ranges from 15,000 to 30,000 m²/kg.

Specifications for using in concrete

 The requirements for used in concrete are generally given in terms of:

 The SiO2 minimum content will limit the quantity of impurities and contaminants in the Silica Fume. The SiO3 is restricted to limit the expansion due to the formation of ettringite. Moisture content of Silica Fume living the furnace is generally negligible. The 3% limit is generous and is likely to be exceed with poor storage.

The standard Specification for Use in Hydraulic Cement Concrete is ASTM C1240.

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 Established in 2008, Weifang Entachem Co.,Ltd is a professional manufacturer and exporter that is concerned with the design, development and production of concrete additives and related building products. We are located in Weifang city Shandong province,near Qingdao port, with convenient transportation access.All of our products comply with international quality standards and are greatly appreciated in a variety of different markets throughout the world.
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