analysis of product characteristics of silica fume-pg电玩城

  silica fume, namely: appearance of gray or gray powder, refractoriness > 1600 ℃. bulk density: 200 ~ 250 kg/m3.

  specifications for

  the chemical composition of silica fume is shown in the following table:sio2 al2o3 fe2o3 mgo cao nao project

  ph average 75 ~ 98% 1.0±0.2% 0.9±0.3% 0.7±0.1% 0.3±0.1% 1.3±0.2%

  fineness of silica fume: the fineness of silica fume less than 1um accounts 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 ~ 100 times of cement and 50 ~ 70 times of fly ash.

   particle morphology and mineralogical structure: in the formation process of silica fume, amorphous round and spherical particles of amorphous phase are formed due to the effect of surface tension in the process of phase change, and the surface is relatively smooth. some are aggregates of multiple round and spherical particles stuck together. it is a kind of ash material with large specific surface area and high activity. a material doped with silica fume in which a small globule acts as a lubricant.

  for use:

  it can be used to fill the pores between cement particles, generate gels with hydration products and react with basic material magnesium oxide to form gels. in cement-based concrete, mortar and refractory castable, adding appropriate amount of silica fume can play the following role:

  1. significantly improve the performance of compression resistance, folding resistance, permeability resistance, corrosion resistance, impact resistance and wear resistance.

  2, with water retention, prevent segregation, bleeding, greatly reduce the concrete pump resistance.

  3, significantly extend the service life of concrete. especially in the chloride pollution erosion, sulfate erosion, high humidity and other harsh environment, the durability of concrete can be doubled or even several times.

  4. greatly reduce the ash on the ground of shotcrete and castable, and increase the thickness of single shotcrete layer.

  5, is a necessary component of high strength concrete, concrete has been c150 engineering applications.

  6, has about 5 times the effectiveness of cement, in ordinary concrete and low cement castable application can reduce costs, improve durability.

  7, effectively prevent the concrete alkali aggregate reaction.

  8. improve the compactness of castable refractories. when coexisting with al2o3, it is easier to generate mullite phase, which can enhance its high temperature strength and thermal vibration resistance.