Method of delaying the set time of cement and the compositions produced therefrom
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United States of America Patent
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May 25, 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 of delaying the set time of cement and to compositions produced therefrom. The set time of hydraulic cement mixtures of fly ash pozzolans, specifically Class C and Class F, and Portland cement can be delayed by controlling the pH of a retarder slurry that is mixed with the dry components of the composition. The pH of the retarder slurry is controlled by balancing the salts therein such that the retarder slurry is acidic, or having a pH less than 7. The slurry activator of the present invention generally includes a pH balancing agent, an acid component, and water. The pH balancing agent 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. Slower setting mortar and concrete compositions having high strength can be prepared with this hydraulic cement.
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