Microsilica

CEMGUARD® Microsilica (Silica Fume) is a by-product of producing silicon metal or ferrosilicon alloys in smelters using electric arc furnaces. It is a grey coloured powder, pozzolanic in nature. It is sourced from a single, dedicated factory in China and produced under strict quality control to maintain the highest levels of product consistency, and ensure minimum standard deviation. In concrete, it fills the space between cement grains - commonly referred to as particle packing or micro-filling. It also reacts with the calcium hydroxide from cement to form an additional binder called calcium silicate hydrate. Both these effects enhance the physical and chemical properties of concrete.
CEMGUARD® Microsilica is available in two dry powder forms - densified and undensified. Densified Microsilica is most popularly used in concrete construction. It is produced by tumbling undensified Microsilica particles in a silo, to form agglomerates with bulk densities between 500-700 KGm3. Undensified Microsilica (bulk density between 200-350 KGm3) is only used in specialized applications as it is not economical to transport because of its low bulk density. Quality-controlled and consistent Microsilica with uniform colour, and sourced from a single, dedicated factory is the key to maximizing its value in various applications. The production facilities of CEMGUARD® Microsilica have an in-house laboratory for testing of key parameters such as retention over SiO2 content, loss-on-ignition and moisture as per standard codes, while bulk density is controlled during the densification process.