Cement compositions containing self-setting pozzolans

Claim 1

A cement composition consisting essentially of a portland cement, at least one self-setting pozzolan material, a fine aggregate, air, water, at least one alkali metal constituent selected from the group consisting of sodium, potassium and lithium ions, at least one anionic constituent, selected from the group consisting of chloride, bromide, nitrite, thiocyanate, cyanate and lactate, which is soluble in water and forms a calcium salt which is also soluble in water, and at least one water soluble oxide of boron compound, wherein: (a) said alkali metal constituent is present in an amount up to approximately 4.0 percent by weight, in terms of the equivalent weight of said sodium ions, of said self-setting pozzolan material; (b) said anionic constituent is present in an amount up to approximately 6.0 percent by weight, in terms of the equivalent weight of chloride ions, of said self-setting pozzolan material; (c) said water soluble oxide of boron compound is present in the range of about 0.01 to 2.0 percent by weight, in terms of the equivalent weight of boron ions, of said self-setting pozzolan material; and said cement composition being further characterized by; (d) having a solid volume ratio of said portland cement to said self-setting pozzolan material within a range of approximately 0.05 to 2.0; (e) having a ratio of the volume of a paste, comprising said self-setting pozzolan material, said portland cement, said air and said water, to the solid volume of said fine aggregate within the range of approximately 0.75 to 2.5; and (f) having a ratio of the solid volume of said portland cement to the volume of said cement composition of less than about 0.19.