Micro Silica/ Silica Fume

Micro Silica/ Silica Fume

                            

Appearance & Size

 It is a white or pink or light to dark grey cementing material.  It’s individual particles are nearly 1/50^th of Portland cement’s particle i.e. extremely fine as average Portland cement’s particle size is in the range 0.1 µm to 0.3 µm corresponding minimum specific area is 15,000 m²/kg. 

Production

During the manufacturing of Silicon metal or ferrosilicon alloys through reduction of high purity quartz in a submerged-arc electric furnace heated to 20000C with coal coke and fueled by wood chips, it is produced as a by-product.

Is it a chemical admixture?

Its chemical action is no different from pozzolanas. It composes of at least 85 percent of ultra-fine amorphous non-crystalline (glassy) spherical silicon dioxide (SiO2) particles. No, it isn’t a chemical admixture. There is no chemical composition formulated for it.

Properties

The more  finer the particle size more will be surface area and more will be its pozzolanic properties.

Uses

·        Reduction in bleeding of fresh concrete

·    Strength and Durability is improved in hardened concrete

·    Reduction in segregation of fresh concrete