MICROSILICA & SILICA FUME TYPE

microsilica & silica fume for concrete type

Silica fume has historically been available in four basic product forms: undensified, slurried, densified, and pelletized. After many years of testing and producing silica-fume concrete around the world, there is no evidence to show that, in a well-designed, properly produced concrete mixture, any of the forms gives better results than the others.

Slurried silica fume is no longer available in themarket; it may be available outside the Undensified silica fume is available,but it is not frequently used in ready-mixed or precast concrete. Undensified silica fume is primarily used in pre-bagged products such as grouts or repair mortars. Pelletized silica fume is primarily used in blended cements. Slurried,undensified, and pelletized silica fume are not discussed in detail in this manual.

densified silica fume and   shows some of the characteristics of this product form. Densified silica fume is produced by treating undensified silica fume to increase the bulk density to between 450 and 700 kg/m³. This increase in bulk density is usually accomplished by tumbling the silica-fume particles in a silo,which causes surface charges to build up. These charges draw the particles together to form weak agglomerates. Because of the increased bulk density, this material is more economical for truck transportation