Ground granulated blastfurnace slag Wikipedia
Groundgranulated blastfurnace slag GGBS or GGBFS is obtained by quenching molten iron slag a byproduct of iron and steelmaking from a blast furnace in water or steam to produce a glassy granular product that is then dried and ground into a fine granulated blast furnace is highly cementitious and high in CSH calcium silicate hydrates which is a strength enhancing