Very fast setting cementitious composition
AssigneeUnited States Gypsum Company
InventorsMarianela Perez-Pena, Ashish Dubey
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Abstract
Extremely fast setting of cementitious compositions for producing cement-based products such as cement boards is made possible by adding an alkanolamine to a hydraulic cement such as portland cement, and forming a slurry with water under conditions that provide an initial slurry temperature of at least 90° F. Use of alkanolamine under conditions disclosed herein allows an extremely rapid setting of the cementitious composition. Additional reactive materials may be included such as high alumina cement, calcium sulfate and a pozzolanic material such as fly ash. The extremely fast rapid set permits rapid production of cementitious products.
Claims42
A method of providing a fast setting slurry comprising mixing an accelerating amount of an alkanolamine with hydraulic cement and water under conditions which provide an initial slurry temperature of at least 90° F. or 32.2° C. said slurry rapidly reaching peak temperature and achieving rapid setting compared to slurries having a lower initial temperature.
A composition for preparing a cement board comprising:
- (a) portland cement;
- (b) mineral additive;
- (c) aggregate;
- (d) as an accelerator for components (a) and (b) an alkanolamine;
- (e) sufficient water to prepare a slurry;
- said slurry being at a temperature of at least 90° F. or 32.2° C. when components (a)-(e) are mixed to form said composition, said slurry rapidly reaching peak temperature and achieving rapid setting compared to slurries having a lower initial temperature.
Dependencies are inferred from the claim text.