In regard to durability good Portland cement concrete is one of the most durable materials known.
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Magnesia, if present in Portland cement in quantity not exceeding 5%, appears to be inert, but there is evidence that in larger proportion, e.g.
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Among, the city's manufactures are refined oil, Portland cement, vitrified brick and tile, glass, asphalt, ice, cigars, drilling machinery, and flour.
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Portland cement clinker, however produced, is a hard, rock-like substance of semi-vitrified appearance and very dark colour.
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Portland cement与发音含义,同义词,反义词,翻译,刑和更多的