SG Heritage Dictionary

Portland cement Webster's Dictionary 1913

A cement having the color of the Portland stone of England, made by calcining an artificial mixture of carbonate of lime and clay, or sometimes certain natural limestones or chalky clays. It contains a large proportion of clay, and hardens under water.

Portland cement Encyclopedia Britannica

PORTLAND CEMENT. See Building, vol. iv. p. 459, and Cements, vol. v. p. 328.

9th ed. Encyclopædia Britannica, vol. 19, p. 530
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