Chloride diffusion is the major factor that affects the life of concrete structures. The time-fractional order equation can be used to describe anomalous diffusion in reinforced concrete. In this work, a time-fractional model of chloride diffusion is solved via the meshless method. The Element-Free Galerkin (EFG) meshless method does not require meshing. One-dimensional and two-dimensional numerical examples are presented. Numerical results are in good agreement with theoretical solutions. The initiation time of corrosion is predicted in the presented model. Simulation results are compared with experimental data. The good agreement between EFG and experimental data indicates that time-fractional chloride diffusion in concrete can be modeled effectively by using the EFG method. This method is beneficial for further research on anomalous chloride diffusion in concrete.

中文翻译：

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混凝土中氯离子扩散的时间分数阶模型：无网格法分析

氯化物扩散是影响混凝土结构寿命的主要因素。时间分数阶方程可以用来描述钢筋混凝土中的异常扩散。在这项工作中，通过无网格方法求解了氯离子扩散的时间分数模型。无元素Galerkin（EFG）无网格方法不需要网格划分。给出了一维和二维数值示例。数值结果与理论解吻合良好。在提出的模型中可以预测腐蚀的开始时间。仿真结果与实验数据进行了比较。EFG与实验数据之间的良好一致性表明，使用EFG方法可以有效地模拟混凝土中氯的时间分数扩散。