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Admixtures and method for accelerating the setting of portland cement compositions

  • US 4,264,367 A
  • Filed: 12/07/1977
  • Issued: 04/28/1981
  • Est. Priority Date: 08/01/1974
  • Status: Expired due to Term
First Claim
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1. A method for accelerating the setting time of a quantity of portland cement composition comprising mixing with the composition:

  • (a) a first ponderable amount of a water-soluble carbonate compound selected from the group consisting of sodium carbonate and potassium carbonate; and

    (b) a second ponderable amount of an α

    -hydroxy carbonyl compound selected from the group consisting of hydroxyacetic acid, lactic acid, 2-methyllactic acid, dl-mandelic acid and their water-soluble salts, the second amount being effective to accelerate the portland cement composition in the absence of any other admixture;

    the first and second amounts being efffective in combination to accelerate the portland cement composition, and essentially the only constituents of the accelerated portland cement composition influencing its setting time being the water-soluble carbonate compound, the α

    -hydroxy carbonyl compound, portland cement, and water.

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