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Ground
granulated blastfurnace slag (GGBS) is a by-product from the blast-furnaces
used to make iron. These operate at a temperature of about 1500
degrees centigrade and are fed with a carefully controlled mixture
of iron-ore, coke and limestone. The iron ore is reduced to iron
and the remaining materials form a slag that floats on top of the
iron. This slag is periodically tapped off as a molten liquid and
if it is to be used for the manufacture of GGBS it has to be rapidly
quenched in large volumes of water. The quenching, optimises the
cementitious properties and produces granules similar to a coarse
sand. This 'granulated' slag is then dried and ground to a fine
powder. |
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