Gypsum cement floor underlayment composition and methods

Details Gypsum cement floor underlayment composition and methods Gypsum cement floor underlayment composition and methods

C - Chemistry, Metallurgy

04

B

261/71

C04B 11/30 (2006.01)

Patent

CA 1189097

ABSTRACT A particulate calcium sulfate hemihydrate-rich composition is prepared by selecting large lumps of mined gypsum, grinding the same so at least 50% by weight passes a 325 mesh (0.045 mm.) sieve, calcining the material at atmospheric pressure to a normal con- sistency not greater than about 54, and regrinding the particulate material to a particle size distribution in which at least about 75% by weight passes a 325 mesh (0.045 mm.) sieve, the latter material exhibiting a normal consistency of not greater than about 53. The resulting material may be mixed with portland cement, a defoaming agent and other materials as de sired, and the mixture may then be combined with sand and water and violently agitated to provide a pump- able, freely pourable slurry which, when poured upon a subfloor, hardens in a layer to provide a strong, crack-resistent floor underlayment.

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