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[GGBFS]

GGBFS

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<p>Ground granulated blast-furnace <a href="https://en.wikipedia.org/wiki/Slag" title="Slag">slag</a> (GGBS or GGBFS) is obtained by <a href="https://en.wikipedia.org/wiki/Quenching" title="Quenching">quenching</a> molten <a href="https://en.wikipedia.org/wiki/Iron" title="Iron">iron</a> <a href="https://en.wikipedia.org/wiki/Slag" title="Slag">slag</a> (a by-product of iron and <a href="https://en.wikipedia.org/wiki/Steel-making" title="Steel-making">steel-making</a>) from a <a href="https://en.wikipedia.org/wiki/Blast_furnace" title="Blast furnace">blast furnace</a> in water or steam, to produce a <a href="https://en.wikipedia.org/wiki/Glassy_phase" title="Glassy phase">glassy</a>, granular product that is then dried and ground into a fine powder. Ground granulated blast furnace slag is a latent hydraulic binder forming <a href="https://en.wikipedia.org/wiki/Calcium_silicate_hydrate" title="Calcium silicate hydrate">calcium silicate hydrates</a> (C-S-H) after contact with water. It is a strength-enhancing compound improving the durability of <a href="https://en.wikipedia.org/wiki/Concrete" title="Concrete">concrete</a>. It is a component of metallurgic cement (CEM III in the European norm EN 197). Its main advantage is its slow release of <a href="https://en.wikipedia.org/wiki/Reaction_heat" title="Reaction heat">hydration heat</a>, allowing limitation of the temperature increase in massive concrete components and structures during <a href="https://en.wikipedia.org/wiki/Cement" title="Cement">cement</a> setting and concrete curing, or to cast concrete during hot summer.</p>

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