High early strength cement and additives and methods for making the same
AssigneeW. R. Grace & Co.-Conn.
InventorsLeslie A. Jardine, Josephine H. Cheung, Walter M. Freitas
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Abstract
A method for improving early strength of cements, comprising introducing into a cement during the grinding thereof (a) at least one water reducer comprising a polyoxyalkylene polymer; (b) a sugar; (c) an alkali or alkaline earth metal chloride; and (d) an amine. Additives and cement compositions are also disclosed.
Claims21
A method for improving early strength of cement comprising:
- introducing into a cement as an interground additive during the grinding of said cement (a) at least one water reducer comprising a polyoxyalkylene comb polymer having a backbone and pendant groups, said comb polymer having oxyalkylene groups in said backbone, said pendant groups, or both, said water reducer being used in the amount of 0.0002-0.4 percent based on dry weight of the cement;
- (b) a sugar in the amount of 0.0001-0.04 percent based on dry weight of the cement;
- (c) an alkali or alkaline earth metal chloride in the amount of 0.0001-1.0 percent based on dry weight of the cement;
- and (d) an amine in an amount of 0.0005-0.15 percent based on dry weight of the cement.
An additive for enhancing early strength of cement, comprising (a) at least one water reducer comprising a polyoxyalkylene comb polymer having a backbone and pendant groups, said comb polymer having oxyalkylene groups in said backbone, said pendant groups, or both, said water reducer being used in the amount of 0.0002-0.4 percent;
- (b) a sugar in the amount of 0.0001-0.04 percent;
- (c) an alkali or alkaline earth metal chloride in the amount of 0.0001-1.0 percent;
- and (d) an amine in an amount of 0.0005-0.15 percent, all percentages being based on dry weight of the cement to which said additive is added during grinding.
Dependencies are inferred from the claim text.