Ground-granulated blast-furnace slag (GGBFS) is produced by quenching molten iron slag (a by-product of iron and steel-making) from a blast furnace in water, to produce a granular product that is then dried and ground into a fine powder.  GGBFS is typically used in concrete requiring a lower heat of hydration, and where resistance to aggressive ground water and adverse environmental conditions are present.  Similarly to fly ash blends, early age strength development is slower than straight cement concrete however strength development from 28 days onwards is equivalent or better.


See below for more information.

Granulated Blast Furnace Slag

Granulated Blast Furnace Slag has a glassy structure and can be used as a fine aggregate or binder.  GBFS is commonly used in the manufacture of blended cements where it is inter-ground or blended separately with cement usually at a 20% - 40% proportion.  Unblended GBFS is can be used in road pavements and building products.

Information sheets

SDS : CASDS44 Granulated Blast Furnace Slag

Ground Granulated Blast Furnace Slag

GGBFS is a supplementary cementitious material when used in concrete.  It enhances a range of concrete performance characteristics such as the reduction of the heat of hydration in mass concrete pours, reduces the permeability of concrete and improves the durability properties of concrete in resistance to aggressive environments.  In NSW Cement Australia markets GGBFS under the brand Ecocem.

Product Data Sheet

PDS: CA0630 Ground Slag

Information sheets

SDS : CASDS44 Ground Granulated Blast Furnace Slag