单词	Portland cement
释义	Portland cement /pɔːtləndsɪˈmɛnt / noun [mass noun] Cement manufactured from chalk and clay which hardens under water and when hard resembles Portland stone in colour.Generally you can use a time-tested Portland cement plaster (1 part Portland cement, 1 part lime, and 4 parts fine sand) for a base coat.... Traditionally, plaster is a mixture of Portland cement, sand and water that is applied in layers to a base of wood or metal lath or perforated plasterboard. Stucco is a siding material made of Portland cement, sand, lime and water.
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