GGBFS can replace 6-60% of the Portland cement in a concrete mix, depending on which of its properties it is chosen for.
It is a by-product of the steel industry, therefore, it is cheaper and more environmentally friendly to use than Portland cement due to it being a recycled waste product.
Some properties of concrete containing GGBFS compared to concrete containing 100% Portland cement are:
GGBFS is used frequently in places that require high resistance to chemical attack; like in marine environments or areas where grit-salt is laid regularly. It is also favoured for some architectural applications because it has a lighter colour than Portland.
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