Methods and compositions for concrete production
AssigneeCarboncure Technologies Inc.
InventorsRobert Niven, George Sean Monkman, Dean Paul Forgeron, Kevin Cail, Joshua Jeremy Brown, Paul J. Sandberg, Mark MacDonald
Life of this patent
Estimating the term…
Abstract
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.
Claims31
A method of carbonating a wet cement mix comprising delivering a dose of carbon dioxide to the wet cement mix during mixing in a mixer, wherein
- the dose is 1.5% or less by weight cement (bwc) in the mix,
- the dose of carbon dioxide is a dose that produces a carbonated cement mix with a flowability at one or more time points after mixing that is within 50% of the flowability of a cement mix of the same mix design that is uncarbonated, and
- the carbon dioxide is delivered by a process that comprises converting liquid carbon dioxide to a mixture of gaseous and solid carbon dioxide and contacting the wet cement mix with the mixture of solid and gaseous carbon dioxide,
- thereby carbonating the wet cement mix.
A method of carbonating a wet concrete mix having a mix design comprising delivering a dose of carbon dioxide to the wet concrete mix during mixing in a mixer, thereby carbonating the wet concrete mix, wherein
- the concrete mix comprises Portland cement comprising gypsum;
- the dose of carbon dioxide is 1.5% or less by weight cement (bwc) in the mix;
- the dose of carbon dioxide is a dose that produces a carbonated concrete mix with a flowability at one or more time points after mixing that is within 50% of the flowability of a concrete mix of the same mix design that is uncarbonated;
- and
- the carbon dioxide is delivered to the concrete mix via a conduit with an opening, wherein the opening is at least 5 cm, on average, from the surface of the mixing concrete mix.
Dependencies are inferred from the claim text.