海洋环境中考虑温湿传导耦合的氯离子渗透模型

针对海洋环境中混凝土构件遭受氯离子侵蚀过程的复杂性,完善考虑温湿传导耦合的氯离子渗透模型。该模型的控制方程以及各项参数均充分体现了侵蚀过程中热量传导、水分扩散以及氯离子渗透的交互影响,并根据与侵蚀性海水的接触程度不同区分了四种温湿—氯离子表面浓度的边界条件,提出了一套依据区域宏观环境信息确定局部微环境的方法,从而实现了对该过程的多参数仿真模拟。通过试验实测数据对模型进行了验证,对比模型分析结果与试验数据发现两者吻合度很高,并证实了处于潮汐影响区的混凝土是遭受氯离子侵蚀最显著的部位。

The Chloride Ion Penetration Model Coupled with Temperature and Moisture Transfer in Marine Environment

Considering the complexity of the chloride ion penetration in concrete exposed to marine environment,an integrated chloride penetration model coupled with temperature and moisture transfer is proposed.The governing equations and parameters embody fully the cross-impacts among thermal conduction,moisture transfer and chloride ion penetration.Furthermore,the four exposure conditions are classified based on the different contact with the aggressive marine environment,and then the micro-climate condition on the concrete surface is investigated according to the regional climate characteristics,therefore,a comprehensive analog simulation to the chloride penetration process is proposed.To demonstrate that the proposed numerical model can correctly simulate the chloride diffusion in concrete,the integrated chloride diffusion model is applied in the reproduction of a real experiment,finally the model gives good agreement with the experimental profiles,and it is proved that the tidal zone exposure results in a more severe attack on the reinforcement.