Ground Granulated Blastfurnace Slag (GGBFS)
Granulated blast-furnace slag is dried and ground into a fine powder that is reactive and when used as cementitious material, forms Calcium and Aluminum silicate hydrate.
The glass content of GGBFS suitable for blending with Portland cement, typically varies between 90-100% and depends on the cooling method. The glass structure of the quenched slag largely depends on the proportions of network-forming elements such as Si and Al over network-modifiers such as Ca, Mg. Increased amounts of network-modifiers lead to higher degree reactivity.
GGBFS is used to make durable concrete structures in combination with ordinary Portland cement other pozzolanic materials. GGBFS has been widely used in Europe, and increasingly in the United States and in Asia for its superiority in concrete durability, extending the lifespan of buildings from fifty years to a hundred years.
Two major uses of GGBFS are in the production of quality-improved slag cement, namely Portland Blast furnace cement (PBFC) and high-slag blast furnace cement (HSBFC), with GBFS content ranging typically from 30 to 70%; and in the production of ready-mixed concrete.
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- Enhanced durability and strength
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- Reduces lifetime construction costs
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- Lower maintenance costs
- Increased life cycle