Evaluating the Impact of Crushing Process on Strength Characteristics and Leachability of Cement-Stabilized Dredged Sediment
Publication: Journal of Materials in Civil Engineering
Volume 35, Issue 6
Abstract
Stabilization of dredged sediment and reusing the mixture as a construction material is an effective way to reduce environmental problems and save natural resources. However, the crushing process that occurs during construction may affect the mechanical properties and leachability of the reused stabilized soil, an issue that is less reported. Therefore, consolidated undrained triaxial tests and semi-dynamic leaching tests were conducted on stabilized sediments and recompacted crushed stabilized sediment grains (SG) to evaluate the influence of the crushing process. The results of the triaxial tests showed that the stabilized sediment exhibited strain-softening and brittle behaviors under various confining pressures (100, 200, and 400 kPa), while strain-hardening and ductile behaviors were more obvious in the SG. The reduction in cohesion between stabilized sediment and the SG reflected a loss of cementation bonding during the crushing process. The overall leaching behaviors versus curing time of heavy metals (As, Cr, Cu, Zn, Pb, Ni, and Hg) in stabilized sediment was similar to that of SG. The leaching mechanism indicated a good immobilization of heavy metals in stabilized sediment, while their stability in SG was poorer. The reason for the differences in triaxial strength properties and leachability were mainly attributed to the fact that the strong cementation bonding was destroyed by the crushing process, weakening the soil structure and raising the potential for release of elements.
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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 work was supported by the National Natural Science Foundation of China (No. 52178327), the Project of Jiangsu Transportation Construction Bureau (No. 2017002), and the Fundamental Research Funds for the Central Universities (No. B200201049). The authors extend thanks to Prof. Akbar A. Javadi for his help.
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Journal of Materials in Civil Engineering
Volume 35 • Issue 6 • June 2023
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© 2023 American Society of Civil Engineers.
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Received: Jan 7, 2022
Accepted: Oct 24, 2022
Published online: Apr 3, 2023
Published in print: Jun 1, 2023
Discussion open until: Sep 3, 2023
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