Granulated Blast Furnace Slag : Granulated blast furnace slag or gbfs is the residue of combustion in the furnace of the steel refining process. It is obtained by quenching molten iron slag from a blast furnace in water or steam, to produce a glassy, granular product that is then dried and ground into a fine powder. Ggbfs or ground granulated blast furnace slag is formed when gbfs is further processed or ground using conventional cement clinker grinding technology. Uses and benefits of GBFS/GGBFS uses : - GGBFS or GBFS is the most used raw material in cement industry to make slag cement. - Lightweight fill - Raw material for the manufacture of glass - GBFS can be used as a substitute for sand in building materials - GGBFS can be used as a replacement for portland cement