Early strength enhancement of cements

Patent metadata

Field	Value
Publication number	US-2020055775-A1
Application number	US-201716485710-A
Country	US
Kind code	A1
Filing date	Oct 25, 2017
Priority date	Feb 13, 2017
Publication date	Feb 20, 2020
Grant date	—

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.

First claim

1 . 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:
R 1 is (C 1 -C 4 )alkyl-OH; and
R 2 and R 3 , each independently, is (C 0 -C 3 )alkyl-COOR*, wherein R* is H, Na + , K + , or ½ Ca ++ .

2 . The method of claim 1 , further including adding to the cement clinker at least one supplemental cementitious material selected from the group consisting of: fly ash, granulated blast furnace slag, limestone, calcined clay, natural pozzolan and artificial pozzolan.

3 . The method of claim 1 , wherein the cement clinker includes C 3 A in an amount of 0.3% to 9.0% based on dry weight of cement clinker.

4 . The method of claim 1 , further comprising grinding with the strength enhancement agent and the cement clinker at least one supplemental component selected from a grinding aid, a set retarding agent, or a set accelerating agent.

5 . The method of claim 1 , further comprising grinding with the strength enhancement agent and the cement clinker at least one grinding aid, and further wherein:
the strength enhancement agent is present in the amount of from 0.001% to 0.03% based on dry weight of the hydraulic cementitious powder, and the at least one grinding aid is added in the amount of from 0.001% to 0.06% based on dry weight of the hydraulic cementitious powder.

6 . The method of claim 1 , further comprising grinding with the strength enhancement agent and the cement clinker at least one grinding aid and a set retarding agent, wherein:
the strength enhancement agent is present in the amount of 0.001-0.03% based on dry weight of the hydraulic cementitious powder; the at least one grinding aid is added in the amount of from 0.001% to 0.06% based on dry weight of the hydraulic cementitious powder; the set retarding agent is added in the amount of 0.001-0.03% based on dry weight of the hydraulic cementitious powder.

7 . The method of claim 1 , further comprising grinding with the strength enhancement agent and the cement clinker at least one grinding aid and a set accelerating agent, wherein:
the strength enhancement agent is present in the amount of from 0.001% to 0.03% based on dry weight of the hydraulic cementitious powder, the at least one grinding aid is added in the amount of from 0.001 to 0.06% based on dry weight of the hydraulic cementitious powder, the set accelerating agent is added in the amount of from 0.001% to 0.2% based on dry weight of the hydraulic cementitious powder.

8 . The method of claim 1 , further comprising grinding with the strength enhancement agent and the cement clinker at least one grinding aid, a set retarding agent, and a set accelerating agent, wherein:
the strength enhancement agent is present in the amount of from 0.001% to 0.03% based on dry weight of the hydraulic cementitious powder, the at least one grinding aid is added in the amount of from 0.001% to 0.06% based on dry weight of the hydraulic cementitious powder, the set retarding agent is added in the amount of from 0.001% to 0.03% based on dry weight of the hydraulic cementitious powder, and the set accelerating agent is added in the amount of 0.001% to 0.2% based on dry weight of the hydraulic cementitious powder.

9 . The method of claim 5 , wherein the grinding aid is one or more of a glycol, glycerin, alkanolamine, acetic acid or an acetic acid salt.

10 . The method of claim 6 , wherein the set retarding agent is one or more of a gluconate salt, a molasses, sucrose, or a corn syrup.

11 . The method of claim 7 , wherein the set accelerating agent is one or more of a thiocyanate salt or a chloride salt.

12 . (canceled)

13 . The method of claim 4 wherein the strength enhancing agent is EDG or a salt thereof, the grinding aid is the glycol, the set retarding agent is sodium gluconate, and the set accelerating agent is sodium thiocyanate.

14 . The method of claim 1 , further including grinding the cement clinker and the strength-enhancing agent with an alkali sulfate.

15 . The method of claim 1 , wherein the content of Na 2 O equivalent in the hydraulic cementitious material is less than or equal to 0.7% by weight of the hydraulic cementitious powder.

16 . A composition prepared by the method of claim 1 .

17 . An additive composition, comprising:
(A) a strength-enhancing agent represented by the following structural formula:

wherein:
R 1 is a (C 1 -C 4 )alkyl-OH; and
R 2 and R 3 , each independently, is a (C 0 -C 3 )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.

18 . The additive composition of claim 17 , wherein the weight ratio of the strength enhancing agent to the grinding aid is from 1:9 to 9:1.

19 . The additive composition of claim 17 , further comprising a set retarding agent, a set accelerating agent, or a mixture thereof.

20 . The additive composition of claim 17 , wherein the strength enhancing agent is N-(2-hydroxyethyl)iminodiacetic acid (EDG) or a salt thereof.

21 . The additive composition of claim 17 , wherein the at least one grinding aid is diethylene glycol.

22 . The additive composition of claim 17 , further comprising sodium gluconate or sodium thiocyanate.

23 . The additive composition of claim 17 , further comprising an alkali sulfate.

24 . A cementitious composition comprising a cementitious binder obtained by grinding a cement clinker with the additive composition of claim 17 .

25 . 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:
R 1 is a (C 1 -C 4 )alkyl-OH; and
R 2 and R 3 , each independently, is a (C 0 -C 3 )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.

26 . 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:
R 1 is a (C 1 -C 4 )alkyl-OH; and
R 2 and R 3 , each independently, is a (C 0 -C 3 )alkyl-COOR*, wherein

R* is H, Na + , K + , or ½ Ca ++ ; and
(B) at least one grinding aid selected from one or more of

Assignees

• Gcp Applied Tech Inc

Inventors

• Silva Denise A
• Cheung Josephine H
• Myers David F
• Chun Byong-Wa
• Rocha Ernie
• Lai Wee Fuk
• Buzzell Leslie J

Classifications

• C04B7/522 Primary

  After-treatment of ground cement (C04B7/368 takes precedence) · CPC title

• C09C3/08

  Treatment with low-molecular-weight {non-polymer} organic compounds {(C09C3/006, C09C3/048 take precedence)} · CPC title

• C09C1/021

  Calcium carbonates · CPC title

• B21B27/027

  Vertical rolls · CPC title

• C04B28/04

  Portland cements · CPC title