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Sensitivity Analyses on Chloride Ion Penetration into Undersea Tunnel Concrete

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Title: Sensitivity Analyses on Chloride Ion Penetration into Undersea Tunnel Concrete
Authors: Zhang, Yafen Browse this author
Yokota, Hiroshi Browse this author →KAKEN DB
Zhu, Yulong Browse this author
Issue Date: Oct-2019
Publisher: Japan Concrete Institute
Journal Title: Journal of advanced concrete technology
Volume: 17
Issue: 10
Start Page: 592
End Page: 602
Publisher DOI: 10.3151/jact.17.592
Abstract: The penetration of chloride ion leads to the corrosion initiation in reinforced concrete, which results in decreasing the durability of concrete. A theoretical diffusion-convection model describing the process of chloride ion penetration into concrete under external water pressure is described by considering multiple affecting factors such as unsaturated flow, fluid-solid coupling, and chloride binding. A numerical model of unsaturated concrete is built to simulate the coupled process. Based on this model, the classic expression of effective diffusion coefficient is modified by considering constrictivity factor, and the sensitivity analysis is carried out on five sets of parameters (i.e., effective diffusion coefficient, saturated permeability, van Genuchten parameters, initial saturation, and binding capacity parameters) aiming at evaluating the robustness of the model. The simulation results show that the multi-mechanism penetration model is computationally feasible, and the multiphysics coupling model can well reproduce the chloride ion transfer process in a microscopic perspective. Furthermore, the sensitivity analysis results indicate that the parameters governing moisture transport process are more sensitive to the prediction of the chloride ion penetration into undersea tunnel concrete.
Type: article
Appears in Collections:工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

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