Early strength enhancement of cements
AssigneeGCP Applied Technologies Inc.
InventorsDenise A. Silva, Josephine H. Cheung, David F. Myers, Byong-Wa Chun, Ernie Rocha, Wee Fuk Lai, Leslie J. Buzzell
Life of this patent
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Abstract
A method of making a cement composition, comprising grinding a cement clinker and a strength-enhancing agent, thereby producing a hydraulic cementitious powder, wherein the strength-enhancing agent is present in the hydraulic cementitious powder in an amount of from 0.001% to 0.09% based on dry weight of the hydraulic cementitious powder. The strength-enhancing agent is a compound represented by the following structural formula (I). The definitions of variables R1, R2, and R3 as well as R10, R20, and R30 are provided herein.
Claims52
A method of making a cement composition, comprising:
- grinding a cement clinker and a strength-enhancing agent, thereby producing a hydraulic cementitious powder,
- wherein:
- the strength-enhancing agent is present in the hydraulic cementitious powder in an amount of from 0.001% to 0.09% based on dry weight of the hydraulic cementitious powder,
- the strength-enhancing agent is a compound represented by the following structural formula:
- wherein:
- R1 is (C1-C4)alkyl-OH;
- and
- R2 and R3, each independently, is (C0-C3)alkyl-COOR*, wherein R* is H, Na+, K+, or ½ Ca++.
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An additive composition, comprising:
- (A) a strength-enhancing agent represented by the following structural formula:
- wherein:
- R1 is a (C1-C4)alkyl-OH;
- and
- R2 and R3, each independently, is a (C0-C3)alkyl-COOR*, wherein
- R* is H, Na+, K+, or ½ Ca++;
- and
- (B) at least one grinding aid selected from one or more of a glycol, glycerin, or acetic acid or an acetic acid salt,
- wherein the additive composition is a liquid.
A cement composition, comprising:
- a hydraulic cementitious powder;
- a strength-enhancing agent, said strength-enhancing agent being present in an amount of from 0.001% to 0.09% based on dry weight of the hydraulic cementitious powder,
- wherein the strength-enhancing agent is a compound represented by the following structural formula:
- wherein:
- R1 is a (C1-C4)alkyl-OH;
- and
- R2 and R3, each independently, is a (C0-C3)alkyl-COOR*, wherein
- R* is H, Na+, K+, or ½ Ca++;
- and
- at least one grinding aid selected from a glycol, glycerin, or acetic acid or an acetic acid salt.
An additive composition for use in grinding with a cement clinker, said composition comprising:
- (A) a strength-enhancing agent represented by the following structural formula:
- wherein:
- R1 is a (C1-C4)alkyl-OH;
- and
- R2 and R3, each independently, is a (C0-C3)alkyl-COOR*, wherein
- R* is H, Na+, K+, or ½ Ca++;
- and
- (B) at least one grinding aid selected from one or more of a glycol, glycerin, or acetic acid or a salt thereof,
- wherein the additive composition is a liquid.
A method for making a strength-enhancing agent, comprising:
- reacting a haloacetic acid chosen from one or more of a chloroacetic acid and a bromoacetic acid, or a salt thereof, with one or more alkanolamines of the structural formula (I)
- under alkaline conditions, to generate the strength-enhancing agent represented by structural formula (II)
- wherein:
- each R10 is independently chosen from H, (C1-C4)alkyl-OH, provided that in structural formula (I) at least one group R10 is not H;
- R20 is chosen from (C1-C4)alkyl-OH, and —C(R4)2COO−M+;
- and
- R30 is —C(R4)2COO−M+;
- each R4 is independently chosen from hydrogen, Br, and Cl;
- and
- M+ is H+, Na+, K+, or ½ Ca++.
An additive composition, comprising:
- a first component;
- and
- a cement additive component
- wherein:
- the cement additive component is one or more agents chosen from a glycol, glycerol, acetic acid or a salt thereof, an alkanolamine, an amine, a carbohydrate, a water-reducing additive, an air-entraining agent, a chloride salt, a nitrite salt, a nitrate salt, and a thiocyanate salt;
- and
- the first component is prepared by reacting a haloacetic acid chosen from one or more of a chloroacetic acid and a bromoacetic acid, or a salt thereof, with one or more alkanolamines of the structural formula (I)
- under alkaline conditions, to generate the first component represented by structural formula (II)
- wherein:
- each R10 is independently chosen from H, (C1-C4)alkyl-OH, provided that in structural formula (I) at least one group R10 is not H;
- R20 is chosen from (C1-C4)alkyl-OH, and —C(R4)2COO−M+;
- and
- R30 is —C(R4)2COO−M+;
- each R4 is independently chosen from hydrogen, Br, and Cl;
- and
- M+ is H+, Na+, ½ Ca++.
A method of making a cement composition, comprising:
- reacting a monohaloacetic acid chosen from monochloroacetic acid and monobromoacetic acid, or a salt thereof, with a alkanolamine chosen from ethanolamine, isopropanolamine, and isobutanolamine under alkaline conditions to generate the strength-enhancing agent represented by the structural formula
- wherein:
- R1 is (C1-C4)alkyl-OH;
- and
- R2 and R3, each independently, represent —CH2COO−R*, wherein R* is H, Na+, K+, or ½ Ca++
- thereby preparing a reaction mixture;
- adding the reaction mixture without purification to a cement clinker;
- and
- grinding the cement clinker and the reaction mixture, thereby producing a hydraulic cementitious powder.
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Dependencies are inferred from the claim text.