Compositions with synthetic gypsum and methods
AssigneeUnited States Gypsum Company
InventorsDennis Mark Lettkeman, John Wesley Wilson, Mike L. Cloud, Brian K. Ball, Raymond A. Kaligian, Doug Blackburn
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Abstract
DTPA-coated synthetic calcined gypsum is provided with alpha-like properties and obtained by spray-coating the synthetic caclined gypsum with DTPA. Cementitious compositions comprising DTPA-coated synthetic calcined gypsum and low water demand are provided as well. Methods for controlling an open time of a cementitious slurry by increasing or decreasing the amount of DTPA-coated synthetic calcined gypsum in the slurry are provided as well.
Claims7
A cementitious composition comprising DTPA-coated synthetic beta calcined gypsum, water and alpha calcined gypsum, and wherein the amount of water in the composition is no more than 50 cc for 100 parts of all gypsum combined;
- and wherein DTPA-coated synthetic beta calcined gypsum comprises from 25% to 85% of all gypsum combined in the composition, based on the dry weight.
Dependencies are inferred from the claim text.