Gas CO2 foaming and intermixing in portland cement paste to sequester CO2

Gas CO2 foaming and intermixing in portland cement paste to sequester CO2

In this study, concentrated CO2 gas was used to create foamed cement paste, and concentrated CO2 gas was intermixed in fresh cement paste to produce regular cement paste materials that were not foamed. The potential of both methods to form CaCO3 from calcium ions that would form Ca(OH)2 was investig...

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Bibliographic Details
Published in:Cement (Amsterdam, Netherlands) Vol. 16; p. 100099
Main Authors: Jativa, Francisco W., Dalton, Laura E., Pourghaz, M.
Format: Journal Article
Language:English
Published: Elsevier B.V 01-06-2024
Elsevier
Subjects:
Carbonation
CO2 sequestration
Compressive strength
Dynamic modulus
CO2 sequestration
Dynamic modulus
Carbonation
Compressive strength
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Summary:In this study, concentrated CO2 gas was used to create foamed cement paste, and concentrated CO2 gas was intermixed in fresh cement paste to produce regular cement paste materials that were not foamed. The potential of both methods to form CaCO3 from calcium ions that would form Ca(OH)2 was investigated. After curing the materials for different ages, the Ca(OH)2 and CaCO3 contents were measured using thermogravimetric analysis; the large void size distributions, dynamic modulus, and compressive strength were tested and compared against Control (no gas added), and N2 foamed and N2 intermixed specimens. A 10% increase in dynamic modulus and compressive strength was measured in CO2 foamed specimens compared to N2 foamed specimens. The increase in mechanical properties was the result of both a narrow void diameter distribution and CaCO3 formation in place of Ca(OH)2. The CO2 foamed cement generation method shows the potential to sequester 0.06 ton of CO2 for every ton of cement which is a CO2 emission reduction of 7.0% of the CO2 production associated with cement production. For the CO2 intermixing method, the void content, compressive strength, and dynamic modulus results were consistent between the Control and CO2 intermixed specimens while the N2 intermixed specimens showed a decrease in compressive strength and dynamic modulus. The CO2 intermixing method showed potential to sequester 0.04 ton of CO2 for every ton of cement or a 4.7% CO2 emission reduction of the total CO2 production associated with cement manufacturing. The reported CO2 emissions are not based on life cycle assessment and do not account for emissions associated with CO2 collection, transportation, and intermixing. The present paper does not investigate the mechanisms of hydration under CO2 intermixing.
ISSN:2666-5492
2666-5492
DOI:10.1016/j.cement.2024.100099