Admixtures and method for accelerating the setting of portland cement compositions
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United States of America Patent
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Apr 28, 1981
Issued Date -
N/A
app pub date -
Dec 7, 1977
filing date -
Aug 1, 1974
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method of and compositions for accelerating the setting time of portland cement compositions are disclosed. Certain admixtures, comprising water-soluble carbonates and .alpha.-hydroxy carbonyl compounds, are employed as accelerators. Preferred accelerators further comprise water-soluble organic compounds having a plurality of hydroxyl groups. The concentration of admixture relative to cement necessary to achieve acceleration depends upon the identity of the admixture, the water-cement ratio, and the amount and type of aggregate in the composition, among other factors.
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