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Gypsum concrete is a building material used as a floor underlayment used in wood-frame and concrete construction for fire ratings, sound reduction, radiant heating, and floor leveling.[1] It is a mixture of gypsum plaster, Portland cement, and sand.[1] The brand name Gyp-Crete, a Maxxon Corporation trademark, has come into general use as a term for gypsum concrete by construction professionals and architects.[2]
en.wikipedia.org