GGBS

(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 70%.in specialist applications such as in aggressive environment and to reduce heat of hydration.

 

Chemical Composition

Chemical ConstitutentPortland CementGGBS
CaO65%40%
sio,20%35%
AI,O,5%10%
MgO2%8%

 

Physical Composition

PropertiesValues
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