The Impact of Accelerated Carbonation on the Microstructure and Mechanical Behavior of Seawater Sea Sand Concrete
Publication: Journal of Materials in Civil Engineering
Volume 35, Issue 10
Abstract
In practice, assessing the mechanical behavior of seawater sea sand concrete under severe environmental conditions is urgently needed to evaluate the service life of the prepared concrete. In this paper, the influence of carbonation on the mechanical properties, especially the stress–strain relationship of seawater and sea sand concrete (SSC), sea sand concrete (SC), and ordinary concrete (OC), were investigated by experimental and theoretical means. The microstructural analysis revealed that SSC and SC have higher sequestration than OC. Although the compressive strength of all concrete specimens increased during the carbonation time, the net increase of compressive strength (excluding cement hydration) contributed by the carbonation of SSC and SC was less than that of OC. The stress–strain curves’ ascending branches of the three types were roughly similar; for the descending branch, the slope of SSC and SC became steeper compared with OC after carbonation. The results also revealed that the brittleness of SSC and SC increased orderly with the extension of carbonation time. Finally, an empirical expression for the stress–strain relationship of SSC and SC considering the effect of carbonation was proposed, which provides an analytical base for concrete structure design and practical application for marine infrastructures.
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Data Availability Statement
All data, models, and code generated or used during the study appear in the published article.
Acknowledgments
This research project was financially supported by the Hong Kong Research Grants Council Theme-Based Research Scheme under Sustainable Marine Infrastructure Enabled by the Innovative Use of Seawater Sea-Sand Concrete and Fibre-Reinforced Polymer Composites (Grant No. T22-502/18-R). The authors would also like to acknowledge the assistance from the department of Civil and Environmental Engineering and Materials Characterizations and Preparation Facility (MCPF) at the Hong Kong University of Science and Technology.
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Journal of Materials in Civil Engineering
Volume 35 • Issue 10 • October 2023
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© 2023 American Society of Civil Engineers.
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Received: Sep 6, 2022
Accepted: Mar 15, 2023
Published online: Jul 31, 2023
Published in print: Oct 1, 2023
Discussion open until: Dec 31, 2023
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