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Composition Condensed silica fume consists primarily of pure silica in non-crystalline form and contains more than 90% silicon dioxide. Small amounts of magnesium, iron, and alkali oxides are also present. Most particles are smaller than 1 mm with an average diameter of 0.1 mm. ASTM C 1240 limits the percent retained on the 45-mm sieve to 10%, the moisture content…

Since microsilica particles are only about 1 / 100 the size of cement grains, the material may be hard to batch and ship. These handling problems may be overcome by mixing microsilica with water (and sometimes other admixtures) in a slurry which replaces part of the normal concrete mixing water. Densification and pelletization have also been tried to simplify the…

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 700 kg/m3 (densified). The specific…

The composite silicate heat insulation coating containing micro silica fume is mainly used as industrial thermal insulation coating, such as high temperature pipeline insulation, or boiler, kiln and other shell insulation, concentrated in power, chemical industry and other industries. 1. The application of the power industry Thermal insulation plays an important role in power plants, especially thermal power plants, such…

High-strength non-shrinkage grouting material (non-shrinkage cement, super-early-strength grouting material, high-strength non-shrink grouting material, cement mortar reinforcement material, cement-based grouting material) is made of high-strength material as aggregate and cement as the base material, supplemented by High fluidity, micro-expansion, anti-segregation and other substances are formulated without iron ion and chlorine salt; early strength, high strength, micro expansion, good fluidity, non-corrosive, impact…

Various types of concrete construction requires different concrete indexs for its construction. The recommended value of these concrete mixes for various types of construction is presented in table below: Type of work Concrete Mix Ratio Max. size of aggregates (mm) Water for dry aggregates (liter)* Water for aggregates condition from dry to moist batch (liter)* Water for best consistency (liter)* Small precast…

The concrete is manufactured using cement, sand, gravel and water as the main components materials. The active material in concrete is cement which binds other materials physically and chemically with water and solidifies. Sometimes admixtures are used in concrete to enhance its properties. 1. Cement There are various types of cements used for manufacture of concrete, but most commonly Portland…