A Numerical Study of Moisture and Ionic Transport in Unsaturated Concrete by Considering Multi-ions Coupling Effect

IF 2.7 3区工程技术 Q3 ENGINEERING, CHEMICAL Transport in Porous Media Pub Date : 2023-10-27 DOI:10.1007/s11242-023-02011-6

Zhaozheng Meng, Yufei Zhang, Wei-kang Chen, Chuan-qing Fu, Qing Xiang Xiong, Cheng-lin Zhang, Qing-feng Liu

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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.

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考虑多离子耦合效应的非饱和混凝土中水分和离子迁移数值研究

了解非饱和多孔介质中的传输机制对于解决水泥基材料的耐久性问题至关重要。然而，多离子电化学耦合效应的参与，尤其是在非饱和条件下，使得传输机制变得更加复杂。本研究对非饱和混凝土中的水分和多离子迁移进行了三维建模。在水分输运中，考虑了水蒸气和液体的贡献。通过采用构成电化学法，计算了由固有电荷失衡引起的静电势。通过参数校准，数值结果与实验数据非常吻合，证明了所提出模型的有效性。参数分析结果表明，忽略多离子耦合效应会导致氯离子浓度被低估，而饱和度对不同离子间的耦合强度有明显影响。此外，粗大聚集体的存在不仅会阻碍质量输运，还会使二维模型和三维模型结果之间的差异更加明显。此外，还着重介绍了现有研究中未报道的其他发现。

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来源期刊

Transport in Porous Media 工程技术-工程：化工

CiteScore

5.30

自引率

7.40%

发文量

155

审稿时长

4.2 months

期刊介绍： -Publishes original research on physical, chemical, and biological aspects of transport in porous media- Papers on porous media research may originate in various areas of physics, chemistry, biology, natural or materials science, and engineering (chemical, civil, agricultural, petroleum, environmental, electrical, and mechanical engineering)- Emphasizes theory, (numerical) modelling, laboratory work, and non-routine applications- Publishes work of a fundamental nature, of interest to a wide readership, that provides novel insight into porous media processes- Expanded in 2007 from 12 to 15 issues per year. Transport in Porous Media publishes original research on physical and chemical aspects of transport phenomena in rigid and deformable porous media. These phenomena, occurring in single and multiphase flow in porous domains, can be governed by extensive quantities such as mass of a fluid phase, mass of component of a phase, momentum, or energy. Moreover, porous medium deformations can be induced by the transport phenomena, by chemical and electro-chemical activities such as swelling, or by external loading through forces and displacements. These porous media phenomena may be studied by researchers from various areas of physics, chemistry, biology, natural or materials science, and engineering (chemical, civil, agricultural, petroleum, environmental, electrical, and mechanical engineering).