Microsilica is a by-product from the production of silicon metal, which is formed when silicon dioxide vapour is condensed.
Topmix uses microsilica in a slurry form, produced by Alchem. Peter Male, Topmixs special products development manager, explains that the opposition tries to use microsilica in powder form: Our
competitors are all trying to combine microsilica powder with water but it settles out in six hours.
Microsilica can be used as a cementitious material to produce concrete that is very strong and virtually impermeable.
All Topmixs microsilica concretes in the Toproc range have compressive strengths greater than 80 mega-Pascals and have higher levels of durability, wear and chemical resistance than conventional concretes.
Varying the formulations produces microsilica concretes with properties such as heat resistance, low density or faster strength gain.