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US 6,641,658 B1Granted
Rapid setting cementitious composition
AssigneeUnited States Gypsum Company
InventorAshish Dubey
Life of this patent
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Abstract
A rapid setting cementitious composition useful for making cement boards employs an insoluble form of anhydrous calcium sulfate (anhydrite) to accelerate setting and to permit reducing the amount of high alumina cement usage.
Claims45
A rapid setting cementitious composition comprising as a reactive powder blend:
- (a) 35 to 90 wt % portland cement;
- (b) 0 to 55 wt % pozzolan
- (c) 5 to 15 wt % high alumina cement;
- and
- (d) 1 to 8 wt % insoluble calcium sulfate anhydrite.
2 more elements
A cement board comprising a rapidly set mixture of a suitable amount of water with a cementitious composition comprising as a reactive powder blend:
- (a) 35 to 90 wt % portland cement;
- (b) 0 to 55 wt % pozzolan;
- (c) 5 to 15 wt % high alumina cement;
- and
- (d) 1 to 8 wt % insoluble calcium sulfate anhydrite.
2 more elements
Dependencies are inferred from the claim text.