Print Email Facebook Twitter A Numerical Study of Moisture and Ionic Transport in Unsaturated Concrete by Considering Multi-ions Coupling Effect Title A Numerical Study of Moisture and Ionic Transport in Unsaturated Concrete by Considering Multi-ions Coupling Effect Author Meng, Z. (TU Delft Materials and Environment; Shanghai Jiao Tong University) Zhang, Yufei (University of Macau) Chen, Wei kang (Shanghai Jiao Tong University) Fu, Chuan qing (Zhejiang University of Technology) Xiong, Qing Xiang (Shanghai Jiao Tong University) Zhang, Cheng lin (Shanghai Jiao Tong University) Liu, Qing feng (Shanghai Jiao Tong University) Date 2023 Abstract Understanding the transport mechanisms within unsaturated porous media is essential to the durability problems associated with cement-based materials. However, the involvement of multi-ions electrochemical coupling effect, especially under unsaturated condition makes the transport mechanisms even more complex. In this study, the moisture and multi-ionic transport in unsaturated concrete have been modeled in three-dimensional cases. The contribution from both water vapor and liquid has been considered in moisture transport. By adopting the constitutive electrochemical law, the electrostatic potential induced by inherent charge imbalance was calculated. With parameter calibration, the numerical results agreed well with the experimental data, proving the validity of the presented model. Results from a parametric analysis showed that neglecting multi-ions coupling effect will lead to an underestimated chloride concentration, and saturated degree has an obvious impact on the coupling strength among different ions. In addition, the existence of coarse aggregates will not only block mass transport but also make the discrepancies between two-dimensional model and three-dimensional model results more obvious. Other findings which have not been reported in existing studies are also highlighted. Subject Chloride transportHeterogeneous natureIonic interactionMoisture transportPorous media To reference this document use: http://resolver.tudelft.nl/uuid:c99e7e01-8498-4132-b86d-099d738b1332 DOI https://doi.org/10.1007/s11242-023-02011-6 Embargo date 2024-04-27 ISSN 0169-3913 Source Transport in Porous Media, 151 (2), 339-366 Bibliographical note Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public. Part of collection Institutional Repository Document type journal article Rights © 2023 Z. Meng, Yufei Zhang, Wei kang Chen, Chuan qing Fu, Qing Xiang Xiong, Cheng lin Zhang, Qing feng Liu Files PDF s11242_023_02011_6.pdf 4.17 MB Close viewer /islandora/object/uuid:c99e7e01-8498-4132-b86d-099d738b1332/datastream/OBJ/view