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US 7,670,427 B2Granted
Very fast setting cementitious composition with high early-age compressive strength
AssigneeUnited States Gypsum Company
InventorsMarianela Perez-Pena, Yanfei Peng, Srinivas Veeramasuneni
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Abstract
A method of making a rapid setting composition for cement boards is disclosed. Compositions including portland cement, fly ash, gypsum, alkanolamine and phosphate are disclosed. A synergistic interaction between the alkanolamine and phosphate increases the effectiveness of accelerating reactions thus allowing for quick setting and increased early-age compressive strength compositions.
Claims42
A method of providing a fast setting cementitious mixture comprising:
- mixing
- water,
- a cementitious reactive powder comprising hydraulic cement, and
- a set accelerating amount of alkanolamine and polyphosphate,
- under conditions which provide a mixture temperature of at least about 90° F.
2 more elements
A composition for preparing a cement board comprising a mixture of:
- a cementitious reactive powder comprising:
- (a)hydraulic cement;
- and
- (b)optional mineral additive;
- an alkanolamine and polyphosphate as accelerators for components (a) and (b);
- and
- water,
- formed by a method comprising mixing the mixture at a temperature of at least 90° F.
5 more elements
Dependencies are inferred from the claim text.