PORTLANDCEMENT
Portland cement
Portland cement is the most common type of cement in general use around the world, used as a basic ingredient of concrete, mortar, stucco, and most non-specialty grout. It usually originates from limestone. It is a fine powder produced by grinding Portland cement clinker, a limited amount of calcium sulfate and up to 5% minor constituents as allowed by various standards such as the European Standard EN 197-1:The above text is a snippet from Wikipedia: Portland cement
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