Methods for carbonation of a cement mix in a mixer

摘要

The invention provides compositions and methods directed to carbonation of a cement mix during mixing. The carbonation may be controlled by one or more feedback mechanisms to adjust carbon dioxide delivery based on one or more characteristics of the mix or other aspects of the mixing operation.

主权项

1. A method for producing a carbonated cement mix in a mix operation in a cement mix apparatus comprising
(i) contacting a cement mix comprising cement binder and aggregate in a mixer with carbon dioxide while the cement mix is mixing, (ii) monitoring at least a first characteristic of the cement binder, the cement mix, a gas mixture in contact with the cement mix or the mixer, or a component of the cement mix apparatus, wherein the first characteristic comprises carbon dioxide content of a gas mixture exiting from the mixer; and (iii) modulating the exposure of the cement mix to the carbon dioxide or another characteristic of the cement mix operation, or a combination thereof according to the characteristic monitored in step (ii).