silica fume for concrete
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silica fume concrete
Silica Fume( Microsilica, Fumed Silica, Condensed Silica Fume, Silica Dust )
Silica fume is a mineral admixture, composed of submicron particles of silicon dioxide, manufactured as a co-product from the production of silicon and ferrosilicon metal. When added to concrete, silica fume acts as both a filler, improving the physical structure by occupying the spaces between the cement particles and as a 'pozzolan, ' reacting chemically to impart far greater strength and durability to concrete. silica fume powder is gray to off-white in color, and is available in several product forms and packaging options.
When added to precast and ready-mixed concrete, silica fume produces high-performance, high-strength concrete with an increased life-span and improved structural economics. Silica fume is available in its as-produced, undensified form. For greater convenience, Densified silica fume, with twice the bulk density, provides many benefits. It is dustless, uniform, smooth, free of lumps and flows readily for bulk handling applications. Dry densified silica fume is the most economical product form for transportation, as its higher density allows bulk handling methods, and reduced shipping costs.
Prevents reinforcing steel corrosion in concrete, due to its extremely low permeability to chloride-ion intrusion and high electrical resistivity.
7Greater impermeability, barring the ingress of moisture, chemicals and other contaminants.
7High early strengths, assuring increased efficiency and greater cost effectiveness in production of prestressed and precast concrete.
7High ultimate compressive strengths (8,000-20,000 psi) , proportionate to amount of silica fume and the water-to-cementitious ratio.
7Substantially greater resistance to corrosion, abrasion and erosion, chemical attack and freeze/thaw damage.