Silica fume is a byproduct of producing silicon metal or alloys in electric arc furnaces. It is collected in large baghouse filters after production. Silica fume is a highly reactive pozzolanic material that is used in small amounts to enhance concrete properties. Its primary chemical properties include being highly amorphous and consisting primarily of silica. In concrete, silica fume reacts with calcium hydroxide to form additional calcium silicate hydrates, densifying the microstructure and improving strength and durability.
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