What is Silica Fume?
Silica fume is a co-product from the production of silicon or ferrosilicon metal. Silica fume is a mineral admixture, a very fine powder of spherical particles that average 0.1 to 0.3 microns in diameter with a surface area of 17 to 30 m2/g. Silica fume is used in a variety of cementitious concrete, grouts and mortars, refractory, elastomer and polymer applications. Silica fume powder is gray to off-white in color.
When silica fume is used in concrete, shotcrete and repair products, it performs as a filler, improving the physical structure by occupying the spaces between the cement particles, and as a reacting chemical (pozzolanic) to create greater strength and durability to concrete.
Silica Fume originates from the oxidation of the SiO gas produced during the fabrication of Silicon, Ferrosilicon alloys and CaSi alloys in electric furnaces. The SiO2 formed is then condensed into spherical particles and recovered in bag house filters.
Silica Fume consists in individual ultrafine particles of silicon dioxide with a high specific surface and an average diameter of 150nm which gives Silica Fume its high pozzolanic properties.
Silica Fume is an amorphous product. Its color ranges from white to dark grey and is available in densified and undensified forms.
for precast concrete with SGS testin
1).Appearance is as grey&white off.
2).High electrical resistivity
4).Superior resistance to chemical attack from chlorides,acids and sulfates
5).Low chloride ion diffusion
6).High reactive Pozzolan
7).High temperature strength
8).Improved stability ingeothermal environment
Microsilica in application of concrete
1）Manufacture high-strength concrete(C79 above),Significantly enhanced the strength of concrete and pumping performance;
2）Manufacture of high permeability(≥P30)，waterproof concrete structure for the MTR,tunnels,the basement of high-rise buildings;
Manufacture marine and chemical concrete,because of its dense high performance,effectively prevent the sulfate and chloride ion permeability of concrete, erosion, avoid being reinforced concrete corrosion,theereby prolonging the life span of concrete;
3）In water highway,bridge project, the basic needs not only of concrete indicators, its wear and erosion resistance is very demanding, micro-doped silica fume is necessary;
4）MICROSILICA fume strong activity, a caustic water properties,applicable to the needs of rapid construction early strength,high strength concrete admixtures;tunnels,subways,large-scale structure in the course of construction Pit Support for the high-strength concrete plus jet; underwater construction project (such as: Pier Dam,and drilling platforms,etc) use in concrete admixture.
1) Concrete or Shotcrete
• Increase its density and strength, improve the performance on its durability,
impact resistance, corrosion resistance, anti-permeability and frost resistance etc
2) Refractory material & Ceramics material
• Greatly improve its density, strength and high temperature performance.
3) Cementitous Repair Products (Mortars & Grouts)
• Low permeability, increase resistance from chlorides, acids, nitrates and sulfate etc
4) Oil Well Grouting
• Increase durability and compressive strength, decrease permeability, better control of gas leakage
5) Concrete Tile, roofing & wallboard,panels
• Lightweight and improve the strength
6) Polymers & rubber product
7) other application, such as waterglass industry, thermal insulation material etc.
Testing Standrds of Slica fume/Microsiliaca
WINITOOR was established in 2004 in Quanzhou Fujian Province of China.We are specialized in the R&D.production and marketing of a series of building material: microsilica(silica fume) ,water reducing agent... they are in the application of concrete(HPC), Mortar ,Refractory,etc. We have built our own microsilica processing plant in the major area of Chinese ferro-silicon and silica metal factories,and our annual output is more than 50000 metric tons.
Relying on many years of a high reputation and good service in the international market, WINITOOR have built excellent business relationships with customers from all over the world, including Middle East countries, Japan,Korea,Viatnam,Indonesia Europe, North America,South-East Asia,Latin-America,and Africa etc.
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4.The content packing particle size may be based on customer demand.
5.We are aimed at doing the best alloy in China.e for precast concrete with SGS testing
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