Properties of Cement Mortars Subject to Varied Carbonation Treatments at Early Ages
Publication: Journal of Materials in Civil Engineering
Volume 35, Issue 12
Abstract
Carbonation of cement-based composites at early ages has attracted great interest to achieve mineral sequestration, as well as to improve the properties. In this study, carbonation of cement mortars of interest (with/without lightweight clinker and fly ash) was investigated from very early ages, with the primary purpose of promoting the proper utilization of carbonation treatment in the concrete industry. To explore the influence of carbonation conditions on the strength, water absorption, carbonation shrinkage, carbonation depth, and gas permeability of mortars at early ages, different carbonation conditions with varying temperatures, concentration, and carbonation duration were studied. Based on the obtained experimental results, it was found that the influence of carbonation on the properties of different mortar matrices tested was consistent. Improving concentration from a natural level () to could remarkably improve the compressive strength gain of mortars at early ages, and the determined strength gain of mortars with 14 days’ carbonation at ambient temperature and concentration of could reach up to 30%–50%. Further rising concentration from to was noted to significantly increase the rate of carbonation shrinkage and almost double the magnitude. Besides, the intrinsic gas permeability and water absorption of mortars could be reduced by accelerated carbonation treatment. The estimated reduction of the intrinsic gas permeability of mortars after carbonation reached approximately 80%–90%. In addition, rising carbonation temperature from ambient temperature to could efficiently improve the early-age strength gain and reduce the gas permeability of mortars in a relatively short carbonation duration (). However, overextended carbonation at appeared to compromise the strength gain at early ages.
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Data Availability Statement
Some or all data, models, or code that support the findings of this study are available from the corresponding author upon reasonable request.
Acknowledgments
The authors acknowledge the financial support from the Danish Offshore Technology Centre (DTU Offshore). Part of this work also received financial support from COWIfonden (Denmark), and the lightweight clinker used in this work was provided by Leca A/S Denmark. Both are greatly acknowledged as well.
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Journal of Materials in Civil Engineering
Volume 35 • Issue 12 • December 2023
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© 2023 American Society of Civil Engineers.
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Received: Dec 28, 2022
Accepted: May 17, 2023
Published online: Sep 28, 2023
Published in print: Dec 1, 2023
Discussion open until: Feb 28, 2024
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