Features:
Grey or dark Powder
None hazard identification
An excellent admixture of concrete and refractory
Descriptions:
Silica fume, also called Microsilica, is a byproduct of producing 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, rather than being land filled.
Silica fume consists primarily of amorphous (non-crystalline) silicon dioxide (SiO2), its
average granule diameter is 0.15~0.20 μm, specific surface area is 15000~20000 m2/kg,
and it has extremely strong surface active. Because of its fine particles, large surface area,
and the high SiO2 content, silica fume is a very reactive pozzolan when used in concrete.
At the same time, silica fume can still be used in the production of refractory and porcelain;
to raise intensity and durability .it also can improve the material overall performance as a
filler, used in paint, coating, resin, rubber and other high molecular material.
Typical Specification (ASTM C1240)
Tested items / Requirement by ASTM C1240 / Analysis result
SiO2(%) / 85, Min / 90. 20
Ca(%) / N.A. / 0. 29
Loss on ignition(%) /6, Max / 2. 82
Spec. surface(BET, m2/g) / 15000, Min / 16800
Retained on 45 μm(%) / 10 / <2.5
Activity index / 105, Min / 114
Bulk Density(kg/m3) / N.A. / 700
PH / N.A / 7.20
Silica fume in refractory:
Enhancing the fluid of pouring refractory, reducing the volume of used water, be easy to
shape, and raising the production efficiency.
Because of its ultra-microstructure for gap filling, the compact and intensity of refractory
gain rising by a wide margin.
Silica fume is a highly effective pozzolanic material, so it's easy to come into being mullite
phase, under the premise that Al2O3 exists, enhance elevated temperature strength and
thermal shock of refractory.
Silica fume in concrete:
Silica fume in concrete fit into general categories of enhancing mechanical properties, improving durability, enhancing construct ability.
Making high-grade concrete effectively enhances the strength and pump ability of strong
concrete.
Making high crack-resistance, self-waterproofing concrete, and be used in the subway,
tunnel and basement of high-rise structures.
Used in maritime works and chemical industry. Owing to the compatibility, it can prevent
effectively sulphate and chlorine ion from osmosizing and eroding avoid the steel corroding
in armored concrete (RC), lengthen the life-span of concrete.
Effects on high-early strength concrete and strong concrete.
In project item for water conservancy and bridge, the concrete not only needs basic quota
mentioned above, but also its wear-resistant quality and abrasion resistance. Thus, adding
silica fume is necessary.
Effects on shotcreting-lined concrete for support in tunnel, subway, and large-scale
foundation ditch.
Used in the construction item under water, such as pier, huge dam and drilling platform.
Used in road surface concrete of expressway and large-scale bridge.
Packing:
1000kgs Jumbo Bag, 20MT per 20’FCL.
If you are interested in it, please feel free to contact us at tdpctw@gmail.com.
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