| 单词 | Portland cement |
| 释义 | Portland cementDefinition Common type of powdery cementitious building material made from finely pulverized alumina, iron oxide, lime, magnesia, and silica burnt together in a kiln. When mixed with water and sand (or gravel) it turns into masonry mortar (or concrete) and, after a series of complex internal reactions, sets like a stone. Invented in 1824 by the UK bricklayer Joseph Aspdin (1779-1855), it gets its name from its resemblance (upon hardening) to the famous Portland limestone (obtained from quarries on the Isle Of Portland), the traditionally preferred choice for building churches, mansions, and palaces. Use 'Portland cement' in a SentenceIf you want to make sure that your new building will last for a very long time you should make sure to use portland cement. If you want to make sure that your building will hold up for the long term you should try building with Portland cement. We got our Portland Cement in finally and we were eager to get going and use it, because we wanted to test out the kiln. |
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