Answer Posted / veeravalli

Micro Silica (or) Silica Fume is a Finer particle than
Cement. It is used in High Strenght Concretes (Example .
M50,M60 & above).
The purpose is to fill the the small voids which cement
can't fill. The surface area of Micro Silica is appx 30000 -
45000 sqm/kg whereas for cement it is 350 - 600 sqm /kg.

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