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- DictionaryPortland cement/pɔːtləndsɪˈmɛnt/
noun
- 1. cement manufactured from chalk and clay which hardens under water and when hard resembles Portland stone in colour.
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noun
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Portland cement is the most common type of cement in general use around the world as a basic ingredient of concrete, mortar, stucco, and non-specialty grout. It was developed from other types of hydraulic lime in England in the early 19th century by Joseph Aspdin, and is usually made from limestone. It is a fine powder, produced by heating limestone and clay minerals in a kiln to form clinker, gri... Wikipedia