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Hydraulic cement and composition employing the same

  • US 4,997,484 A
  • Filed: 06/05/1990
  • Issued: 03/05/1991
  • Est. Priority Date: 12/11/1987
  • Status: Expired due to Term
First Claim
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1. A hydraulic cement consisting essentially of, by weight the following cement forming constituents:

  • from about 90.8 to 99 parts Class C fly ashfrom about 0.4 to 4.2 parts alkali metal activatorfrom about 0.6 to 5 parts citric acidfrom about 0 to 3 parts set control materials, said alkali metal activator being selected from the class consisting of potassium hydroxide, potassium carbonate, sodium hydroxide, and sodium carbonate; and

    said admixture is at least one material selected from the class consisting of borax;

    a sodium salt of a copolymer of an unsaturated carboxylic acid and the hydroxyalkyl ester of such acid;

    a modified lignosulfonate, with catalyst; and

    a dispersion of sulfonated naphthalene formaldehyde condensate, a gluconate, and a lignosulfonate.

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