	US 12,421,169 B2
	Carbonation of concrete aggregates
Michael Thomas, Buckhorn (CA); George Sean Monkman, Halifax (CA); Alex Hanmore, Halifax (CA); and Dean Paul Forgeron, Hacketts Cove (CA)
Assigned to CARBONCURE TECHNOLOGIES INC., Dartmouth (CA)
Appl. No. 17/606,415
Filed by CARBONCURE TECHNOLOGIES INC., Dartmouth (CA)
PCT Filed Apr. 27, 2020, PCT No. PCT/IB2020/053953 § 371(c)(1), (2) Date Oct. 25, 2021, PCT Pub. No. WO2020/217232, PCT Pub. Date Oct. 29, 2020.
Claims priority of provisional application 62/865,898, filed on Jun. 24, 2019.
Claims priority of provisional application 62/839,303, filed on Apr. 26, 2019.
Prior Publication US 2022/0194852 A1, Jun. 23, 2022
This patent is subject to a terminal disclaimer.
Int. Cl. C04B 18/167 (2023.01); B28C 5/38 (2006.01); C04B 28/02 (2006.01); C04B 40/02 (2006.01)

CPC C04B 18/167 (2013.01) [B28C 5/388 (2013.01); C04B 28/02 (2013.01); C04B 40/0231 (2013.01)]

26 Claims

1. A method for carbonating recycled concrete aggregate (RCA) comprising

(i) introducing carbon dioxide to a container comprising RCA, wherein carbon dioxide is introduced during grading/classification of crushed RCA;

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

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

whereby the RCA is carbonated to produce carbonated RCA.