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基于Faraday定律,建立了动态锈蚀速率下的锈蚀产物膨胀模型,并将锈蚀产物的膨胀等效为径向位移边界条件施加于钢筋-混凝土界面。建立了混凝土保护层在锈胀力作用下逐步开裂的数学模型,预测了混凝土保护层锈胀开裂的时间。并将模型预测的保护层锈胀开裂时间和试验观察的时间进行对比,验证了模型的正确性。最后对模型所包含的参数进行灵敏度分析,分析了各参数对混凝土保护层锈胀开裂时间的影响。
Based on Faraday’s law, the expansion model of corrosion products under dynamic corrosion rate was established, and the expansion of the corrosion products was equivalent to the radial displacement boundary conditions applied to the steel-concrete interface. The mathematic model of concrete protective layer cracked gradually under the effect of corrosive expansion was established, and the time of corrosion cracking of concrete protective layer was predicted. The prediction of the model of the protective layer of corrosion cracking time and the experimental observation of the time compared to verify the correctness of the model. Finally, the sensitivity analysis of the parameters contained in the model was carried out, and the influence of each parameter on the cracking time of concrete cover was analyzed.