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Analysis and modeling of bound water adsorption by mixed clay based on adsorption theory

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An Editorial Expression of Concern to this article was published on 28 September 2021

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Abstract

The bound water in soil directly controls the special physical, chemical, and mechanical properties of clay. This paper carries out isothermal adsorption tests on a series of artificially mixed clays and explores the relationship between bound water content and clay mineral composition (montmorillonite content). On this basis, three common empirical models of adsorption were adopted to fit the isothermal adsorption data separately, and their applicability to bound water adsorption by clay was evaluated in turn. The results show that by the isothermal adsorption method, the relatively humidity (RH) of 0.9 is the boundary between strong and weak bound waters, and the RH of 0.98 is the boundary between weak bound water and free water; For the mixed clays with the same mineral composition, the bound water content linearly increases with the growing content of montmorillonite; GAB model works excellently at RH = 0 ~ 100%, with a good fitting effect (R2>0.90); the parameters of GAB model have clear physical meanings, and change in line with the trend of the hydration process of bound water adsorption by clay. Therefore, GAB model is the most suitable model for fitting the isothermal adsorption data on bound water of clay.

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Acknowledgments

This research was supported by the National Natural Science Foundation of China [Grant No. 41962014, 52068016], the Natural Science Foundation of Guangxi Province, China [Grant No. 2018GXNSFAA138182], and the opening fund from Guangxi Key Laboratory of New Energy and Building Energy Saving [Grant No. 19-J-21-21, No. 16-J-21-6].

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Authors and Affiliations

  1. Department of Energy Engineering and Building Environment, Guilin University of Aerospace Technology, Guilin, 541004, China

    Yanhua Xie

  2. College of Civil Engineering and Architecture, Guilin University of Technology, Guilin, 541004, China

    Zhaotian Zeng, Binghui Zhang, Yan Zhang & Shuanghui Tang

  3. Henan Haoding Building Foundation Engineering Co., Ltd, Zhengzhou, 450008, China

    Shuanghui Tang

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  1. Yanhua Xie
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  2. Zhaotian Zeng
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  3. Binghui Zhang
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  4. Yan Zhang
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Correspondence to Zhaotian Zeng.

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Responsible Editor: Ahmed Farouk

This article is part of the Topical Collection on Big Data and Intelligent Computing Techniques in Geosciences

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Xie, Y., Zeng, Z., Zhang, B. et al. Analysis and modeling of bound water adsorption by mixed clay based on adsorption theory. Arab J Geosci 14, 1089 (2021). https://doi.org/10.1007/s12517-021-07430-7

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  • DOI: https://doi.org/10.1007/s12517-021-07430-7

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