Strength improvement admixture
AssigneeConstruction Research & Technology GmbH
InventorsJeffrey R. Bury, Thomas M. Vickers, Jr., Bruce J. Christensen
Life of this patent
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Abstract
A strength improvement admixture composition is provided that increases the compressive strength of cementitious compositions without negatively increasing the setting time. The admixture comprises the components of a polycarboxylate dispersant, a set retarder, and a strength improvement additive.
Claims25
A strength improvement admixture composition comprising:
- a. polycarboxylate dispersant;
- b. set retarder;
- and
- c. a strength improvement additive selected from the group consisting of poly(hydroxyalkylated)polyethyleneamines, poly(hydroxyalkylated)polyethylenepolyamines, poly(hydroxyalkylated)polyethyleneimines, poly(hydroxyalkylated)polyamines, hydrazines, 1,2-diaminopropane, polyglycoldiamine, poly(hydroxyalkyl)amines and mixtures thereof;
- wherein the amount of polycarboxylate dispersant is from about 5% to about 80%, the set retarder is from about 0.5% to about 40%, and the strength improvement additive is from about 0.5% to about 40% based on the total dry weight of the admixture composition components.
The admixture composition of cl aim 1 wherein the set retarder is selected from the group consisting of an oxy-boron compound, a polyphosphonic acid, lignosulfonates, sulphonic acid-acrylic acid copolymer, and their corresponding salts, carboxylic acid, hydroxycarboxylic acid, polycarboxylic acid, hydroxylated carboxylic acid, fumaric, itaconic, malonic, borax, gluconic, and tartaric acid, ascorbic acid, isoascorbic acid, polyhydroxysilane, polyacrylamide, carbohydrates and mixtures thereof.
A cementitious composition comprising hydraulic cement and a strength improvement admixture composition, said admixture composition comprising:
- a. polycarboxylate dispersant;
- b. set retarder;
- and
- c. a strength improvement additive selected from the group consisting of a poly(hydroxyalkylated)polyethyleneamines, poly(hydroxyalkylated)polyethylenepolyamines, poly(hydroxyalkylated)polyethyleneimines, poly(hydroxyalkylated)polyamines, hydrazines, 1,2-diaminopropane, polyglycoldiamine, poly(hydroxyalkyl)amines and mixtures thereof;
- wherein the amount of polycarboxylate dispersant is from about 5% to about 80%, the set retarder is from about 0.5% to about 40%, and the strength improvement additive is from about 0.5% to about 40% based on the total dry weight of the admixture composition components.
Dependencies are inferred from the claim text.