Granted Patent B2

US 12,497,329 · App. 18/766,537 · Granted Dec 16, 2025

Inventors: Michael Thomas (Buckhorn, CA); George Sean Monkman (Halifax, CA); Alex Hanmore (Halifax, CA); Dean Paul Forgeron (Bayside, CA)

Assignee: CARBONCURE TECHNOLOGIES INC.

C04B18/167B28C5/388C04B28/02C04B40/0231

Abstract

Claims (22)

1 . A method comprising introducing carbon dioxide into a container comprising recycled concrete aggregates (RCA), wherein the RCA is a concrete where hydraulic cement in the concrete has already hydrated, and wherein the introduction of carbon dioxide is intermittent and the RCA is agitated during some or all of the introduction of carbon dioxide into the container.

2 . The method of claim 1 wherein the carbon dioxide is a mixture of solid and gaseous carbon dioxide.

3 . The method of claim 1 further comprising

(i) determining a value for one or more characteristics of the RCA, the container, or gas within the container; and

(ii) based at least in part on the value determined in step (i), modulating the introduction of carbon dioxide into the container.

4 . The method of claim 3 wherein the one or more characteristics comprise one or more of pressure of gas within the container, temperature of the RCA, the container, and/or gas within the container, concentration of carbon dioxide within and/or in proximity to the container, duration and flow rate for introducing carbon dioxide into the container, and/or humidity in the container.

5 . The method of claim 1 wherein the RCA is contacted with the carbon dioxide during or immediately after a crushing operation, during grading/classification of crushed RCA, after grading/classification of crushed RCA, or a combination thereof.

6 . The method of claim 1 wherein the carbon dioxide comprises liquid carbon dioxide.

7 . The method of claim 1 wherein, before carbon dioxide is introduced into the container, performing one or more tests on the RCA, wherein the one or more tests comprise determining moisture content of the RCA, and, if necessary based on the results of the test, altering the moisture content of the RCA.

8 . A method comprising

(i) performing one or more tests on RCA, wherein the RCA is a concrete where hydraulic cement in the concrete has already hydrated, to be treated with carbon dioxide, wherein the one or more tests comprise determining moisture content of the RCA;

(ii) if necessary, based on the results of (i), altering the moisture content of the RCA;

(iii) placing the RCA in a container; and

(iv) introducing carbon dioxide into the container to carbonate the RCA, wherein the RCA is agitated during some or all of the introduction of carbon dioxide into the container.

9 . The method of claim 8 wherein the introduction of carbon dioxide comprises intermittent introduction.

10 . The method of claim 8 wherein the carbon dioxide is a mixture of solid and gaseous carbon dioxide.

11 . The method of claim 8 further comprising

(v) determining a value for one or more characteristics of the RCA, the container, or gas within the container; and

(vi) based at least in part on the value determined in step (ii), modulating the introduction of carbon dioxide into the container.

12 . The method of claim 11 wherein the one or more characteristics comprise one or more of pressure of gas within the container, temperature of the RCA, the container, and/or gas within the container, concentration of carbon dioxide within and/or in proximity to the container, duration and flow rate for introducing carbon dioxide into the container, and/or humidity in the container.

13 . The method of claim 8 wherein the RCA is contacted with the carbon dioxide during or immediately after a crushing operation, during grading/classification of crushed RCA, after grading/classification of crushed RCA, or a combination thereof.

14 . The method of claim 8 wherein carbon dioxide comprises liquid carbon dioxide.

Assignments (2)

Continuity (4)

References Cited (400)