Agents for enhancing cement strength
OwnerElise Berodier, Josephine H. Cheung +1inventors
InventorsElise Berodier, Josephine H. Cheung, Leslie J. Buzzell
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Abstract
A method of forming a cement composition. The method comprises adding to a hydraulic cementitious material a first strength-enhancing agent and a second strength-enhancing agent, wherein the content of total alkali (Na2O equivalent) in the hydraulic cementitious material is less than or equal to 0.7% by weight of the cementitious material. The first strength-enhancing agent includes a compound represented by structural formula (I): and the second strength-enhancing agent is sodium sulfate, potassium sulfate, or a mixture thereof. The example values of the variables in structural formula (I) and the example amounts of the first and second strength-enhancing agents being added are defined herein.
Claims27
A method of forming a cement composition, comprising:
- adding to a hydraulic cementitious material a first strength-enhancing agent and a second strength-enhancing agent,
- wherein:
- the content of total alkali (Na2O equivalent) in the hydraulic cementitious material is 0.12 to 0.7% by weight of the cementitious material;
- the first strength-enhancing agent includes a compound represented by structural formula (I):
- wherein:
- each R1, R2, R3, and R4, independently is a —(C1-C4)alkyl-OH, and R0 is a (C1-C4) alkylene;
- and
- the first strength-enhancing agent is added in an amount of from 0.0005% to 0.20% by weight of the hydraulic cementitious material;
- the first strength-enhancing agent includes tetrahydroxyethylethylenediamine (THEED);
- the second strength-enhancing agent is sodium sulfate;
- and
- the second strength-enhancing agent is added in an amount of 0.05-0.30 percent Na2O equivalent by weight of the hydraulic cementitious material.
An admixture composition for manufacturing cementitious compositions, comprising:
- a first strength-enhancing agent and a second strength-enhancing agent, wherein:
- the first strength-enhancing agent includes a compound represented by structural formula (I):
- wherein:
- each R1, R2, R3, and R4, independently is a —(C1-C4)alkyl-OH, and R0 is a (C1-C4) alkylene;
- and
- the first strength-enhancing agent being present in the amount of 0.1 to 80% by dry weight solids of the admixture composition;
- the first strength-enhancing agent includes tetrahydroxyethylethylenediamine (THEED) and at least one or more of diethanolisopropanolamine (DEIPA) or ethanol diisopropanolamine (EDIPA);
- the second strength-enhancing agent is sodium sulfate;
- and
- the second strength-enhancing agent is present in an amount of 20% to 99.9% Na2O equivalent by dry weight solid of the admixture composition.
A method of forming a cement composition, comprising:
- adding to a hydraulic cementitious material a first strength-enhancing agent and a second strength-enhancing agent,
- wherein:
- the content of total alkali (Na2O equivalent) in the hydraulic cementitious material is 0.12 to 0.7% by weight of the cementitious material;
- the first strength-enhancing agent includes a compound represented by structural formula (I):
- wherein:
- each R1, R2, R3, and R4, independently is a —(C1-C4)alkyl-OH, and R0 is a (C1-C4) alkylene;
- and
- the first strength-enhancing agent is added in an amount of from 0.0005% to 0.20% by weight of the hydraulic cementitious material;
- the first strength-enhancing agent includes tetrahydroxyethylethylenediamine (THEED) and at least one or more of diethanolisopropanolamine (DEIPA) or ethanol diisopropanolamine (EDIPA);
- the second strength-enhancing agent is sodium sulfate;
- and
- the second strength-enhancing agent is added in an amount of 0.05-0.30 percent Na2O equivalent by weight of the hydraulic cementitious material.
Dependencies are inferred from the claim text.