The dust collected from the smokestack of a coal-fired plant
Lightly roasted fine-grained clay used as cement
Certain volcanic soils much used by the ancients
Or "rice husk ash" - the ground remains of burnt rice hulls
A by-product of silicon and ferrosilicon alloy production
Or more fully, "Ground, granulated blast furnace slag", a by-product of steel production
Inter American Conference on Non-Conventional Materials and Technologies in Ecological and Sustainable Construction, IAC-NOCMAT, 2007, Maceió
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