Pressure compacting of settable gypsum/plaster compositions
AssigneeRhone-Poulenc Industries
InventorMichel Deleuil
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Abstract
A settable molding composition comprising a mix of gypsum, plaster, water [which may be provided in whole or in part by utilizing a "wet" gypsum component] and an essentially water-insoluble metallic salt of an organic fatty acid [the "waterproofing" agent] is readily pressure compacted or molded into a variety of useful shaped articles, e.g., modular constructional units and other load-bearing members. The resultant shaped articles are highly water repellent, display excellent mechanical properties, are effectively set even in the absence of any drying step, and are even well suited for certain building elements adapted to be exposed to an outside environment.
Claims27
A settable molding composition, which comprises a particulate, intimate admixture of (1) finely divided, powdery plaster, (2) a finely divided powdery water donor therefor selected from the group consisting of gypsum powder having a given content of free water and a mixture of gypsum powder and free water, the total amount of water present being at least that amount stoichiometrically required for complete setting of the admixture, and (3), uniformly homogeneously distributed therethrough, a minor amount of a finely divided waterproofing agent, said agent being an essentially water-insoluble metallic salt of an organic fatty acid.
Dependencies are inferred from the claim text.