Investigation of Bound Water in Clay Based on Isothermal Adsorption Experiments and Metadynamics Studies from the Perspective of Water Potential
Publication: Journal of Geotechnical and Geoenvironmental Engineering
Volume 150, Issue 11
Abstract
The presence of bound water in clay has a significant impact on the physical and chemical properties of clay, particularly its strength, permeability, and creep behavior. In this paper, the bound water in clay has been studied from the perspective of water potential. Initially, the adsorption isotherms of powders and consolidated samples for Na- and Ca-bentonite and illite were measured, and the bound water content was determined by subtracting the capillary water in the isotherms, with the capillary water being calculated by mercury intrusion porosimetry tests. The results indicated that bound water is independent of the void ratio and pore structure of clay, which is consistent with previous studies. Then, metadynamics was conducted to determine the adsorption free energy landscapes of the three clays, and the lowest suctions of the three clay minerals were determined to be , , and , respectively. Finally, through a comparison of the simulations and experiments in this study and in the literature, three important conclusions were drawn. Firstly, the lowest water potential for montmorillonite exhibits a linear relationship with the hydration free energy of exchangeable cations. Secondly, the critical water potential for tightly bound water is determined as the first inflection point in the relationship between water potential and water content, and the critical value of montmorillonite is found to be correlated to the valence of exchangeable cations. Lastly, the boundary between loosely bound water and capillary water is determined as the starting point of capillary water formation. Overall, this research highlights the importance of considering water potential as a key factor in understanding the behavior of bound water in clay.
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Data Availability Statement
Some or all data, models, or codes generated or used during the study are available from the corresponding author by request.
Acknowledgments
The authors gratefully acknowledge the support from Key Laboratory of Earth Fissures Geological Disaster, Ministry of Natural Resources, the General Research Fund project (No. 15214722) from the Research Grants Council of Hong Kong Special Administrative Region Government of China, and the Applied Basic Research Program of Liaoning Province (No. 2023JH2/101300139).
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Journal of Geotechnical and Geoenvironmental Engineering
Volume 150 • Issue 11 • November 2024
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© 2024 American Society of Civil Engineers.
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Received: Jul 21, 2023
Accepted: Jun 5, 2024
Published online: Sep 11, 2024
Published in print: Nov 1, 2024
Discussion open until: Feb 11, 2025
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