Admixture for nonplastic cement mixes and method
AssigneeMartin Marietta Corporation
InventorsRichard R. Nicholson, Sally L. Vista, Reynold A. Berkey
Life of this patent
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Abstract
A hydraulic cement mix including hydraulic cement, aggregate, sufficient water to effect hydraulic setting of the cement, and an admixture comprising a mixture selected from an olefin sulfonate, an alkylarylsulfonate, an alkyloamide, an ethoxylated fatty amine, an alkanolamine, and a hydrolyzed starch having a dextrose equivalent value in the range of commercial corn syrups, the admixture being present in an amount sufficient to increase the compressive strength of nonplastic cementitious mixes such as those used in making masonry units, pipe and the like. Generally, the additive is present in an amount between 0.005 and 0.5 weight percent based on weight of cement.
Claims18
A method for increasing the strength of nonplastic hydraulic cement mixes comprising incorporating into a hydraulic cement mix an admixture comprising:
- an alpha olefin sulfonate;
- an alkylolamide;
- an alkanolamine;
- and glucose or its oligomers through a degree of polymerization characterized by commercial corn syrup, wherein the olefin sulfonate is incorporated into said cement mix at about 0.005 to about 0.5% by weight of cement, and said alkylolamide is incorporated into said cement mix at about 0.005 to 0.5% by weight of cement, and said and said alkanolamine is incorporated into said cement mix at about 0.01 to 0.1% by weight of cement, and said glucose and glucose oligomers are incorporated into said cement mix at about 0.01 to 0.02% by weight of cement.
A method for increasing the strength of nonplastic hydraulic cement mixes comprising incorporating into a hydraulic cement mix an admixture comprising:
- an anionic surfactant selected from the alkanolamine or alkali metal salts of alpha olefin sulfonic acids and alkylarylsulfonic acids, sulfate esters of fatty acids or ethoxylated fatty acids of carbon chain length of the order of about 8 to about 20;
- and a nonionic surfactant selected from alkylolamides prepared by reaction of a fatty acid amide with ethylene oxide and ethoxylated fatty amines, wherein the anionic surfactant is incorporated into said cement mix at about 0.005% to 0.5% by weight of cement, and the nonionic surfactant is incorporated into said cement mix at about 0.005% to 0.5% by weight of cement.
A nonplastic hydraulic cement mix comprising hydraulic cement, aggregate, water and an admixture comprising:
- (a) the alpha olefin sulfonate;
- (b) alkylolamide;
- (c) an alkanolamine;
- and (d) glucose or its oligomers through a degree of polymerization characterized by commerical corn syrup, wherein the olefin sulfonate is incorporated into said cement mix at about 0.005 to about 0.5% by weight of cement, said alkylolamide is incorporated into said cement mix at about 0.005% to 0.5% by weight of cement, said alkanolamine is incorporated into said cement mix at about 0.01% to 0.1% by weight of cement, and said glucose and glucose oligomers are incorporated into said cement mix at about 0.01% to 0.2% by weight of cement.
Dependencies are inferred from the claim text.