Quick-setting concrete and a method for making quick-setting concrete

• US 5,624,493 A
• Filed: 04/19/1995
• Issued: 04/29/1997
• Est. Priority Date: 04/19/1995
• Status: Expired due to Fees

• Current Assignee: United States Of America As Represented By The Department Of Energy
• Original Assignee: United States Of America As Represented By The Department Of Energy
• Inventors: Singh, Dileep, Pullockaran, Jose D., Knox, Lerry, Wagh, Arun S.
• Primary Examiner(s): Bell, Mark L.
• Assistant Examiner(s): MARCHESCHI, MICHAEL A
• Application Number:
  US08/424,947
• Time in Patent Office: 741 Days
• Field of Search: 106/739, 106/738, 106/792, 106/793, 106/817, 106/812
• US Class Current: 106/817
• CPC Class Codes: C04B 22/002 Water
• CPC Class Codes: C04B 28/02 containing hydraulic cements other than calcium sulfates
• CPC Class Codes: C04B 40/0028 Aspects relating to the mixing step of the mortar preparation
• CPC Class Codes: C04B 40/0608 Dry ready-made mixtures, e.g. mortars at which only water or a water solution has to be added before use
• CPC Class Codes: C04B 7/36 Manufacture of hydraulic cements in general
• CPC Class Codes: Y02P 40/18 Carbon capture and storage [CCS]

Abstract

A method for producing quick setting concrete is provided comprising hydrng a concrete dry mixture with carbonate solution to create a slurry, and allowing the slurry to cure. The invention also provides for a quick setting concrete having a predetermined proportion of CaCO₃ of between 5 and 23 weight percent of the entire concrete mixture, and whereby the concrete has a compression strength of approximately 4,000 pounds per square inch (psi) within 24 hours after pouring.

Claims

1. A method for producing quick setting concrete comprising:

a.) heating a mixture consisting of a calcareous material and an argillaceous material to produce cement powder and carbon dioxide;

b.) mixing said carbon dioxide with an hydroxide solution to produce a carbonate solution;

c.) combining said cement powder with aggregate to produce a dry concrete mixture whereby 10 to 80 percent of the weight of the concrete mixture is cement;

d.) mixing said dry concrete mixture with said carbonate solution in a cement;

carbonate solution weight ratio selected from approximately 4;

1 to 6;

1 to produce a slurry; and

e.) allowing the slurry cure.

2. The method as recited in claim 1 wherein the carbonate solution is comprised of water and a carbonte compound selected from the group consisting of (NH₄)₂ OO₃, Li₂ (CO₃), Na₂ (CO₃), K₂ (CO₃), LiHCO₃, NaHCO₃, KHCO₃, and combinations thereof.

3. The method as recited in claim 2 wherein the carbonate solution is between approximately 50 percent and 100 percent saturated in water.

4. The method as recited in claim 1 wherein the cement:

carbonate solution weight ratio is 5;

1.

12. The method as recited in claim 1 wherein the hydroxide solution is selected from the group consisting of ammonium hydroxide, lithium hydroxide, sodium hydroxide and potassium hydroxide.

13. The method as recited in claim 1 wherein the hydroxide solution has a molarity selected from the range of between approximately 0.1M and 0.5M.

5. A method for producing quick-setting concrete

a.) heating a mixture consisting of calcareous material and argillaceous material to a temperature selected from between 1,350°

and 1800°

C. to produce cement powder and carbon dioxide;

said mixture having a weight ratio of calcareous material to argillaceous material of between approximately 74;

26 and 77;

23

b.) bubbling the carbon dioxide through ammonium hydroxide solution to form ammonium carbonate solution;

c.) adding aggregate to the cement powder to produce a dry mixture of concrete, said dry mixture of concrete having from 10 to 80 percent of its weight consisting of cement;

d.) mixing the ammonium carbonate solution with the dry mixture of concrete in an ammonium carbonate to dry mixture of concrete weight ratio of between 9;

100 and 24;

100 to form a slurry; and

e.) allowing the slurry to cure.

6. The method as recited in claim 5 wherein the calcareous material comprises limestone, marl, or combinations thereof.

7. The method as recited in claim 5 wherein the argillaceous material comprises clay, shale, sand, or combinations thereof.

8. The method as recited in claim 5 wherein the ammonium hydroxide solution has a molarity selected from a range of between approximately 0.13 and 0.26 molar.

9. A quick-setting concrete having a weight percent of CaCO₃ of between approximately 5.7 and 22.5 and whereby between 10 and 24 percent of the weight of the CaCO₃ is sequestered CO₂, said CO₂ is generated during production of the concrete.

10. The concrete as recited in claim 9 wherein the concrete achieves a compression strength of approximately 4,000 pounds per square inch within 24 hours of initial mixing.

11. The concrete as recited in claim 10 wherein the 4,000 pounds per square inch compression strength is attained within 30 minutes of initial mixing.