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该文建立了热、湿度和氯离子在混凝土中耦合传输的模型。通过引入损伤因子,考虑混凝土结构承受环境载荷时,混凝土耐久性能退化,加快湿度和氯离子在混凝土中运输速率。建立了混凝土热传导、湿度扩散和氯离子运输控制方程,并在空间域和时间域离散,采用有限元方法求解。将数值模拟结果和解析解对比,验证了数值模型的准确性和可靠性,此外进一步研究各种因素(对流、耐久性退化、结合效应)对混凝土中钢筋起锈时间的影响。
The paper establishes a model of heat, humidity and chloride ion coupling in concrete. By introducing the damage factor, considering the concrete structure withstand environmental load, the durability of concrete will degrade, speeding up the humidity and the chloride ion transport rate in concrete. The governing equations of heat conduction, humidity diffusion and chloride transport in concrete are established and dispersed in the spatial and temporal domains. The finite element method is used to solve the equations. The numerical simulation results are compared with the analytical solutions to verify the accuracy and reliability of the numerical model. In addition, further study of various factors (convection, durability degradation, combined effect) on the concrete reinforcement rust time.