Method for accelerating setting of cement and the compositions produced therefrom
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United States of America Patent
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Dec 7, 2004
Grant Date -
N/A
app pub date -
Aug 26, 2002
filing date -
Aug 24, 2001
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The invention pertains to a method for producing rapid setting cement and to the compositions produced therefrom. The setting time of hydraulic cement compositions comprising Portland cement and fly ash can be accelerated by controlling the pH of an activator slurry used in the composition. The pH of the activator slurry is controlled by non-stoichiometrically balancing the accelerating salts therein such that the activator slurry is alkaline, or having a pH greater than 7. The slurry activator of the present invention generally includes a base component, an acid component, and water. The base component can include any basic alkali and alkaline earth metal hydroxide, or a salt of the acid component. The acid component may include a hydroxycarboxylic acid, preferably citric acid. Mortar and concrete compositions can be prepared with this hydraulic cement wherein the compositions can achieve high strengths in a short time.
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