GYPSUM-CONTAINING PRODUCT HAVING INCREASED RESISTANCE TO PERMANENT DEFORMATION AND METHOD AND COMPOSITION FOR PRODUCING IT

• Main Authors: BOEHNERT, FREDERICK, M, JONES, FREDERICK, T, YU, QIANG, MLINAC, RAYMOND, J, SUCECH, STEVEN, W, GROZA, BRENT, E
• Format: Patent
• Language: English; French
• Published: 10.02.2000
• Edition: 7
• Subjects: ARTIFICIAL STONE; BUILDING; BUILDING MATERIALS; CEMENTS; CERAMICS; CHEMISTRY; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDINGMATERIALS; CONCRETE; FIXED CONSTRUCTIONS; LIME, MAGNESIA; METALLURGY; PERFORMING OPERATIONS; REFRACTORIES; SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS, SLAG, OR MIXTURESCONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER; SLAG; STRUCTURAL ELEMENTS; TRANSPORTING; TREATMENT OF NATURAL STONE; WORKING CEMENT, CLAY, OR STONE

The invention provides a set gypsum-containing product having increased resistance to permanent deformation and a method for preparing it comprising forming a mixture of a calcium sulfate material, water, and an appropriate amount of one or more enhancing materials chosen from condensed phosphoric acids, each of which comprises 2 or more phosphoric acid units; and salts or ions of condensed phosphates, each of which comprises 2 or more phosphate units. The mixture is then maintained under conditions sufficient for the calcium sulfate material to form a set gypsum material. L'invention concerne un produit contenant du gypse durci, présentant une résistance accrue à la déformation permanente, ainsi qu'un procédé de préparation de ce produit consistant à former un mélange d'un matériau à base de sulfate de calcium, d'eau et d'une quantité d'au moins un matériau activateur choisi parmi les acides phosphoriques condensés, comprenant chacun au moins deux unités acide phosphorique, et des sels ou des ions phosphate condensés, comprenant chacun au moins deux unités phosphate. Le mélange est ensuite maintenu dans des conditions suffisantes pour que le matériau à base de sulfate de calcium forme un matériau à base de gypse durci.