High early-strength cementitious composition
AssigneeConstruction Research & Technology GmbH
InventorsJames Edward Anderson, Joseph Andrew Daczko, John Joseph Luciano
Life of this patent
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Abstract
A high early-strength cementitious composition comprising a hydraulic cement; and a combination admixture system wherein the combination admixture system comprises a polycarboxylate high range water reducing dispersant in combination with an accelerator and a retarder. The admixture allows for acceptable workability and development of high early-strength in cementitious compositions without the use of an external heat source.
Claims55
A composition of admixtures for cementitious compositions comprising:
- a) a polycarboxylate high range water reducing dispersant;
- b) an accelerator;
- and
- c) a retarder;
- which in combination provides the cementitious compositions with flexural strength of at least 400 pounds per square inch and compressive strength of at least 2,200 pounds per square inch within 4 hours after placement.
A high early-strength cementitious composition comprising a hydraulic cement and a composition of admixtures, said composition of admixtures in combination comprising:
- a) a polycarboxylate high range water reducing dispersant;
- b) an accelerator;
- and
- c) a retarder;
- wherein said high early-strength cementitious composition within 4 hours after placement has a flexural strength of at least 400 pounds per square inch and compressive strength of at least 2,200 pounds per square inch.
A method for making a high early-strength cementitious composition comprising forming a mixture of water, hydraulic cement and a combination of admixtures, said composition of admixtures in combination comprising:
- a) a polycarboxylate high range water reducing dispersant;
- b) an accelerator;
- and
- c) a retarder;
- wherein said high early-strength cementitious composition within 4 hours after placement has a flexural strength of at least 400 pounds per square inch and compressive strength of at least 2,200 pounds per square inch.
A high early-strength cementitious composition, comprising a hydraulic cement and a composition of admixtures, said composition of admixtures in combination comprising:
- a) a polycarboxylate high range water reducing dispersant of the following formula;
- D=a component selected from the group consisting of the structure d1, the structure d2, and mixtures thereof;
- X=H, CH3, C2 to C6 Alkyl, Phenyl, Substituted Phenyl;
- Y=H, —COOM;
- R=H, CH3;
- Z=H, —SO3M, —PO3M, —COOM, —OR3, —COOR3, —CH2OR3, —CONHR3, —CONHC(CH3)2 CH2SO3M, —COO(CHR4)nOH where n=2 to 6;
- R1, R2, R3, R5 are each independently —(CH2CHRO)mR4 random copolymer of oxyethylene units and oxypropylene units where m=10 to 500 and wherein the amount of oxyethylene in the random copolymer is from about 60% to 100% and the amount of oxypropylene in the random copolymer is from 0% to about 40%;
- R4=H, Methyl, C2 to C6 Alkyl;
- M=Alkali Metal, Alkaline Earth Metal, Ammonia, Amine, Methyl, C2 to C6 Alkyl;
- a=0-0.8;
- b=0.2-1.0;
- c=0-0.5;
- d=0-0.5;
- and
- wherein a, b, c, and d represent the mole fraction of each unit and the sum of a, b, c, and d is 1.0;
- b) an accelerator;
- and
- c) a retarder.
Dependencies are inferred from the claim text.