Silica fume is a byproduct of producing silicon metal or ferrosilicon alloys. One of the most beneficial uses for silica fume is in concrete. Due to its chemical and physical properties, it is a very reactive pozzolan. Concrete containing silica fume with very high strength that can be very durable. It is available from concrete admixtures suppliers which is just simply added during concrete production. Placing, finishing, and curing silica-fume concrete require special attention on the part of the concrete contractor.