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what is silica fumes or micro silica? and whr is it used?
wat r its advantages?
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Answer Posted / silicafume
Silica fume is also called Microsilica ,micro
silica ,silica dust ,which is widely used in concrete’s
field and refractory’s field, ceramic and rubber
applications.
Silica fume is a by-product from manufacturing silicon
metal or ferrosilicon alloys. The smoke that results from
furnace operation is collected and sold as silica fume,
rather than being landfilled. Silica fume is widely used in
concrete and refractory applicaton. One of the most
beneficial uses for silica fume is in concrete. Silica fume
consists primarily of amorphous (non-crystalline) silicon
dioxide(SiO2). The individual particles are extremely
small, approximately 1/100th the size of an average cement
particle. Because of its chemical & physical properties,
like high silica content & extreme fineness, silica fume is
a very effective pozzolanic material. Concrete containing
silica fume can have very high strength and can be very
durable.
Silica fume is added to Portland cement concrete to improve
its properties, in particular its compressive strength,
bond strength, and abrasion resistance. These improvements
stem from both the mechanical improvements resulting from
addition of a very fine powder to the cement paste mix as
well as from the pozzolanic reactions between the silica
fume and free calcium hydroxide in the paste. Addition of
silica fume also reduces the permeability of concrete to
chloride ions, which protects the reinforcing steel of
concrete from corrosion, especially in chloride-rich
environments such as coastal regions and those of humid
continental roadways and runways (because of the use of
deicing salts) and saltwater bridges.
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