(GGBS) is a by product from the blast-furnaces used to make iron. Blast furnaces are fed with controlled mixture of iron-ore, coke and limestone, and operated at a temperature of about 1,500°C. GGBS 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.

GGBS is a partial replacement for cement in Concrete and replacement rates for GGBS can be up to specialist applications such as in aggressive environment and to reduce heat of hydration.


Chemical Composition

Chemical ConstitutentPortland CementGGBS


Physical Composition

ColourOff- White powder
Bulk Density1.0- 1.1 tonnes/ m3
Relative Density (Vibrated)1.2-1.3 tonnes/ m3
Relative Density2.85 -2.95
Surface Area350- 500 m2/kg blaine

Application of GGBS includes all types of civil engineering works where OPC is used

  • Mass Concrete works like dams, tunnel linings and aqueducts
  • Underground work where possibilities of contamination of soil or water exist
  • Marine & coastal structures like ports, jetties, docks, etc
  • Water and sewage treatment plants, drainage and rain harvesting works
  • Bridges and bridge deck in aggressive environments
  • Nuclear waste encapsulation, bio gas plants, geo-thermal and fertilizer plants
  • Chemical industries, refineries, distilleries, sugar and food processing plants
  • Concrete roads and food paths