Micro silica ,also called silica fume or micro silica, is a byproduct of production silicon metal or ferrosilicon alloys. Silicon metal and alloys are produced in electric furnaces.The raw materials are quartz,coal and woodchips. The smoke that results from furnace operation is collected and sold as silica fume, silica fume consists primarily of amorphous(non-crystalline) silicon dioxide(SiO2),its average granule diameter is 0.15~0.20um, specific surface area is 15000~20000 m2/kg,and it has extremely strong surface active.
1, Silica fume Concrete has high strenth (C70 above) , the strength that increases concrete significantly and pump send function;
2, (of ooze of production Gao Kang≥P30) , structure from waterproof concrete, use at the basement; of building of the subway, channel, high level
3, size of granuality of microsilica fume distributings reasonable, compact sex is strong, hardness is big, wear-resisting performance is good, the tension that can heighten condensate substantially, fight pressure, fight impact strength and wear-resisting function, fight strong grind ability to be able to raise 0.5—2.5 times.
4, microsilica can increase coefficient of thermal conductivity, the change is gooey gender and increase flame retardation.
5, the radiative peak temperature that can drop epoxy resin solidify to react, reduce the shrinkage of the linear expansion coefficient of condensate and condensate, eliminate internal stress thereby, prevent craze.
6, the granuality as a result of small silicon pink is fine, distributing reasonable, decrease and eliminate precipitation can effectively, statified phenomenal;
7, microsilica fume is pure, matter content is low, content changes function stability, make condensate is had good insulation property and fight electric arc function.
8, production sea labour and chemical concrete, because its are tall compact function, prevent sulfate and chloric ion effectively the osmosis to concrete, erode, avoid concrete reinforcing steel bar to be corroded, lengthen the life; of concrete thereby
9, the chemical composition of micro silica fume is 2 oxidation silicon (SiO2) , belong to inert material, as acerbity as much, alkaline do not have chemical reaction, small silicon pink distributings equably, enclothe in thing surface, have stronger corrosion resistance, fight empty corrode ability to raise 3—16 times.
10, density of accumulation of microsilica fume is small: One kind is between 0.2-0.8, one kind is between 1.0-2.2. Regard polymer fill as material, othere and mineral sex is filled article dosage is little, outfit loading capacity is small, save polymer dosage, because this can reduce product cost.
11, frost resistance of silica fume: Small silicon pink is in through 300—500 second fast aspic dismisses a circulation, relatively stretch model measures grand low 10—20% , and common concrete passes 25—50 second loop, grand of quantity of relatively stretch model is low for 30—73% . Because this can increase the frost resistance of concrete.
12, microsilica fume is early strong sex: Concrete of silica fume makes induction period shortens, have early strong character. These character are very good!
13, microsilica fume is in project of project of irrigation works, freeway, bridge, concrete needs afore-mentioned main index not only, righter its wear-resisting, be able to bear or endure erode have very slashing demand, pink of silicon of mix into in a subtle way is very necessary;
14, the active with small silicon extremely strong pink, have the property that decrease water, those who apply to fast construction need is early the additive; channel of concrete of strong, excel in, subway, large base the project of construction of additive; underwater of the concrete of excel in eject that uses at timbering in process of tunnel construction construction (be like: Platform of pier, large dams, artesian well) the additive; used in concrete.
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