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A hydraulic cement is formed from a Class C fly ash, an alkali metal activator, and citric acid. Mortar and concrete compositions can be prepared with this hydraulic cement. The cement is particularly useful in producing mortar and concrete compositions that achieve high strengths in a short time, i

A hydraulic cement is formed from a Class C fly ash, an alkali metal activator, and citric acid. Mortar and concrete compositions can be prepared with this hydraulic cement. The cement is particularly useful in producing mortar and concrete compositions that achieve high strengths in a short time, in particular, a mortar having a strength of at least 2500 psi in 24 hours, when cured at room temperature.

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A hydraulic cement consisting essentially of, by weight the following cement forming constituents: from about 90.8 to 99 parts Class C fly ash from about 0.4 to 4.2 parts alkali metal activator from about 0.6 to 5 parts citric acid from about 0 to 3 parts set control materials, said alkali metal act

A hydraulic cement consisting essentially of, by weight the following cement forming constituents: from about 90.8 to 99 parts Class C fly ash from about 0.4 to 4.2 parts alkali metal activator from about 0.6 to 5 parts citric acid from 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.