Retarder for calcium sulfoaluminate cements
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United States of America Patent
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Nov 16, 2004
Grant Date -
Dec 25, 2003
app pub date -
Mar 3, 2003
filing date -
Mar 2, 1999
priority date (Note) -
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Abstract
When hydrated, calcium sulfoaluminate cements form ettringite. A retarder which retards this reaction is at least one of phosphono alkyl carboxylic acid and a salt of a phosphono alkyl carboxylic acid. Additionally, the retarder can comprise at least one of a carboxylic acid and a salt of a carboxylic acid. The retarder can be prepared as an admixture for addition to cement, or the retarder can be included in a cementitious formulation. Also, other cements, such as portland cement, can be included with the calcium sulfoaluminate cementitious formulation. A method of retarding the set of a calcium sulfoaluminate cementitious formulation without substantially reducing achievable compressive strength, comprises providing in the cementitious formulation, a retarder comprising a component being at least one of phosphono alkyl carboxylic acid and a salt of a phosphono alkyl carboxylic acid.
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