What is Ground Granulated Blast Furnace Slag? How is it produced?

GGBS (also known as GGBS or GGBFS) is manufactured from blast furnace slag, a by-product from the manufacture of iron. It is obtained by quenching molten iron blast furnace slag immediately in water or stream, to produce a glassy granular product that is then dried and ground into a fine powder (GGBS). It is an excellent binder to produce high performance cement and concrete.