2024-03-29T12:17:39Z
https://nagoya.repo.nii.ac.jp/oai
oai:nagoya.repo.nii.ac.jp:02002171
2023-12-06T01:45:01Z
488:489:490
Time-dependent water vapor desorption isotherm model of hardened cement paste
Rymeš, Jiří
Maruyama, Ippei
Aili, Abudushalamu
open access
© 2021. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/
Calcium-silicate-hydrate (C-S-H)
Microstructure
Diffusion
Long-term performance
Modeling
This study aims to enhance moisture transport modeling by elucidating the so-called anomalous water diffusion in cementitious materials. Water desorption isotherms are measured from samples at various drying stages using techniques with different durations to quantify the impact of the drying duration on the water sorption ability. A single water sorption isotherm does not solely give a relationship between the water content and relative humidity but also represents the state of microstructure. The continuous evolution of a desorption isotherm due to drying-induced microstructural rearrangement is demonstrated. For numerical modeling, the microstructural alteration can be explicitly considered through a dynamic desorption isotherm model, which governs the local thermodynamic equilibrium at the capillary meniscus. This approach is implemented into a multiphase transport code, whose ability to predict drying is validated using literature data. Finally, the effect of prolonged drying on the colloidal nature of the calcium-silicate-hydrate gel is discussed.
Elsevier
2023-12-01
2021-12
eng
journal article
AM
http://hdl.handle.net/2237/0002002171
https://nagoya.repo.nii.ac.jp/records/2002171
https://doi.org/10.1016/j.cemconres.2021.106612
0008-8846
Cement and Concrete Research
150
106612
https://nagoya.repo.nii.ac.jp/record/2002171/files/Manuscript_MoisturePaper_Revised.pdf
application/pdf
1.2 MB
2023-12-01