Composition:
Condensed silica fume consists primarily of pure silica in non-crystalline form and contains more than 90% silicon dioxide. Small amounts of magnesium, iron, and alkali oxides are also present. Most particles are smaller than 1 mm with an average diameter of 0.1 mm. ASTM C 1240 limits the percent retained on the 45-mm sieve to 10%, the moisture content to 3%, and the loss on ignition (LOI) to 6%.
Condensed silica fume is frequently referred to by other names. Here are some of the other names for silica fume:
Condensed silica fume
Microsilica
Silica fume
Application of Condensed silica fume:
– Concrete.
– Cementitous Repair Products.
– Concrete Tile & Panels.
– FCB, Concrete Roofing & Wallboards.
– Shotcrete.
– Oil Well Grouting.
– Polymers & Elastomers.
– Repair Products.
– Refractory & Ceramics.
– Sustainability
Replacement:
Condensed silica fume is used as a replacement for portland cement. Silica fume can replace portland cement in the range of 9-15% by mass of cement.
Advantages
Using silica fume concrete creates the following advantages:
– Increased pore refinement
– Increased strength
– Stickiness
– Black/gray color
– Increased ASR resistance
– Increased sulfate resistance
– Consumes Ca(OH)2
