Ground granulated blast furnace slag(GGBS,GGBFS)

Ground granulated blast furnace slag(GGBSorGGBFS) is obtained by quenching molten (a by-product of iron and making) from a in water or steam, to produce a glassy, granular product that is then dried and ground into a fine powder.

GGBS is used to make durable concrete structures in combination with

ordinary portland cement and/or other pozzolanic materials.

Two major uses of GGBS are in the production of quality-improved slag

cement, namely Portland Blastfurnace cement (PBFC) and High Slag

Blastfurnace cement (HSBFC), with GGBS content ranging typically from

30 to 70%; and in the production of ready-mixed or site-batched durable

concrete.

Concrete made with GGBS cement sets more slowly than concrete made with

ordinary Portland cement, depending on the amount of GGBS in the

cementitious material, but also continues to gain strength over a

longer period in production conditions. This results in lower heat of

hydration and lower temperature rises, and makes avoiding cold joints

easier, but may also affect construction schedules where quick setting

is required.

Use of GGBS significantly reduces the risk of damages caused by alkali

-silica reaction (ASR), provides higher resistance to chloride ingress

— reducing the risk of reinforcement corrosion — and provides higher

resistance to attacks by sulfate and other chemicals.