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pozzolan, pozzolana, pozzuolana, puzzolana. Variety of volcanic sand with burnt granules resembling powdered brick: it is a siliceous or siliceous and aluminous material which, when mixed with hydraulic limes and water, becomes a cement-like compound capable of setting under water. It was used in Antiquity. Artificial pozzolan was made by calcining fire clay and adding lime, sand, and water, with fine brick dust.
N i (1835);
W. Papworth (1852);
Sturgis et al. (1901–2)
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