High molecular weight additives for calcined gypsum and cementitious compositions
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United States of America Patent
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Mar 4, 2008
Grant Date -
Oct 27, 2005
app pub date -
Mar 27, 2003
filing date -
Mar 27, 2002
priority date (Note) -
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Abstract
A mixture is used in conjunction with water is used for preparing a slurry that hydrates to form an exterior gypsum cement. The mixture includes 30-70% by weight hydraulic cement, 30-70% by weight calcined gypsum and 0.05-2.5% polycarboxylate. When the mixture is added to water less than 40 weight % based on the weight of the mixture, a slurry is formed that expands very little while it cures.
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