DECREASED EVAPORATION WITH RETARDER FOR A HIGH WATER TO STUCCO RATIO LIGHTWEIGHT BOARD

A gypsum slurry includes calcium sulfate hemihydrate, a set retarder in amounts of at least 0.15lb/MSF, a set accelerator, water and aqueous foam. The set accelerator is selected to provide nucleation sites for crystallization of calcium sulfate dihydrate and is present in amounts of at least 5 Ib/M...

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Bibliographic Details
Main Authors WITTBOLD, JAMES, R, LI, ALFRED, PETERSEN, BRUCE, LYNN
Format Patent
LanguageEnglish
French
Published 09.07.2009
Subjects
ARTIFICIAL STONE
CEMENTS
CERAMICS
CHEMISTRY
COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDINGMATERIALS
CONCRETE
ELECTRIC HEATING
ELECTRIC LIGHTING NOT OTHERWISE PROVIDED FOR
ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
ELECTRICITY
LIME, MAGNESIA
METALLURGY
REFRACTORIES
SLAG
TREATMENT OF NATURAL STONE
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Summary:A gypsum slurry includes calcium sulfate hemihydrate, a set retarder in amounts of at least 0.15lb/MSF, a set accelerator, water and aqueous foam. The set accelerator is selected to provide nucleation sites for crystallization of calcium sulfate dihydrate and is present in amounts of at least 5 Ib/MSF. The water to calcium sulfate hemihydrate ratio is at least 0.95. Further, aqueous foam is added in amounts sufficient to create a gypsum board having a dry density of about 29 to about 35 lbs/ft3. L'invention concerne une suspension de gypse incluant du sulfate de calcium hémihydrate, un retardateur de prise en des quantités d'au moins 0,15 livres/MSF, un accélérateur de prise, de l'eau et une mousse aqueuse. L'accélérateur de prise est choisi pour former des sites de nucléation pour cristallisation du sulfate de calcium dihydrate et est présent en des quantités d'au moins 5 livres/MSF. Le rapport entre eau et sulfate de calcium hémihydrate est d'au moins 0,95. En outre, une mousse aqueuse est ajoutée en des quantités suffisantes pour créer un panneau de gypse ayant une masse volumique à sec d'environ 29 à environ 35 livres/pied3.
Bibliography:Application Number: WO2008US88185