Water Vapor Adsorption-Desorption Properties of Unsaturated Loesses

DOI

10.2991/978-94-6463-726-7_69How to use a DOI?

Keywords

Unsaturated loess; Water vapor adsorption; Desorption; Isothermal adsorption curves

Abstract

To study the water vapor adsorption and desorption characteristics of unsaturated loess under different initial moisture contents and environmental humidity changes, isothermal adsorption tests were conducted at various humidity levels. The experimental results indicated that relative humidity is a decisive factor in the water vapor adsorption and desorption of unsaturated loess. The mode of adsorption changes with different humidity levels, shifting from monolayer adsorption to multilayer adsorption and then to capillary condensation. Moreover, the higher the humidity, the greater the initial adsorption rate and equilibrium adsorption capacity, while the opposite is true for desorption. When the moisture content varies, the desorption rates are similar and the isothermal adsorption curves are alike. The equilibrium adsorption capacity increases, the desorption amount decreases, and the monolayer adsorption capacity increases with higher moisture content. Additionally, the water vapor adsorption capacity is directly related to the distance from the adsorption sites to the adsorption surface. If the distance is too large, adsorption cannot be completed. However, during desorption, this distance only affects the initial desorption rate, with the equilibrium desorption amount remaining consistent.

Copyright

© 2025 The Author(s)

Open Access

Open Access This chapter is licensed under the terms of the Creative Commons Attribution-NonCommercial 4.0 International License (http://creativecommons.org/licenses/by-nc/4.0/), which permits any noncommercial use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license and indicate if changes were made.

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TY  - CONF
AU  - Ling Tie
AU  - Jiandong Li
AU  - Xu Wang
PY  - 2025
DA  - 2025/06/13
TI  - Water Vapor Adsorption-Desorption Properties of Unsaturated Loesses
BT  - Proceedings of the 2024 6th International Conference on Hydraulic, Civil and Construction Engineering (HCCE 2024)
PB  - Atlantis Press
SP  - 688
EP  - 695
SN  - 2589-4943
UR  - https://doi.org/10.2991/978-94-6463-726-7_69
DO  - 10.2991/978-94-6463-726-7_69
ID  - Tie2025
ER  -