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氯盐侵蚀会引起钢筋锈蚀,造成其保护层开裂,进而导致结构性能退化。研究氯离子在混凝土内扩散原理以及钢筋初始锈蚀时间,对钢筋混凝土结构耐久性及寿命预测有重要意义。本文利用元胞自动机(CA)原理,建立模拟钢筋混凝土内氯离子扩散过程的CA模型,该模型考虑了时间效应、水灰比和温度的影响。基于建立的CA模型,通过编写Matlab程序,分析钢筋混凝土板、钢筋混凝土方形和圆形柱中一维和二维氯离子扩散行为,并预测钢筋初始锈蚀时间。研究结果及与现有解析解和数值解比较表明,本文建立的模型是正确、有效的,与其他数值方法相比精度更高。
Chloride corrosion can cause corrosion of steel bars, causing the protective layer to crack, which in turn can degrade structural performance. Studying the principle of chloride ion diffusion in concrete and the initial corrosion time of steel bars are of great significance to the durability and life prediction of reinforced concrete structures. In this paper, CA model is established to simulate the chloride diffusion process in reinforced concrete by using the principle of cellular automata (CA). The model considers the effect of time, water-cement ratio and temperature. Based on the established CA model, one-dimensional and two-dimensional chloride ion diffusion behaviors in reinforced concrete slabs, reinforced concrete square and circular columns were analyzed by writing Matlab program, and the initial corrosion time of rebar was predicted. The results of the study and comparison with the existing analytical solutions and numerical solutions show that the model established in this paper is correct and effective and has higher accuracy than other numerical methods.