Gypsum-cement system for construction materials

Details Gypsum-cement system for construction materials Gypsum-cement system for construction materials

C - Chemistry, Metallurgy

04

B

C04B 7/04 (2006.01) C04B 7/13 (2006.01) C04B 28/14 (2006.01) E04C 2/06 (2006.01)

Patent

CA 2314382

A compositioii for use in construction materials, which may be substituted for high performance concrete, patching materials, joint compounds, and the like, such as backer boards or panels, which includes a settable calcium sulfate, preferably a hemihydrate, Portland cement, a finely divided pozzolanic material, lime, and an aggregate, optionally including other additives. The volume ratio of the aggregate to the combined calcium sulfate, Portland cement, pozzolanic material, and lime (a cementitious binder) is equal to or greater than 2/1. Panels made from this composition are useful, particularly when exposed to water since they have good dimensional stability.

Une composition à utiliser dans des matériaux de construction en remplacement de béton à haute performance, de matériaux de ragréage, de composés à joints, et d'autres matériaux analogues tels des panneaux ou des planches d'appui; la composition contient du sulfate de calcium prêt à mettre en forme, de préférence un semi-hydrate, du ciment Portland, un matériau pouzzolanique en fines particules, de la chaux et un agrégat; elle peut aussi contenir d'autres additifs. Le volume d'agrégat par rapport à la combinaison sulfate de calcium, ciment Portland, matériau pouzzolanique et chaux (un liant à base de ciment) est égal ou supérieur à 2 pour 1. Les panneaux faits de cette composition sont utiles, particulièrement lorsqu'ils sont exposés à l'eau puisqu'ils ont une bonne stabilité dimensionnelle.

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