项目名称： 海洋大气环境下混凝土中温湿度-氯离子耦合传输机理及数值模拟研究

项目编号： No.51509084

项目类型： 青年科学基金项目

立项/批准年度： 2016

项目学科： 水利工程

项目作者： 张庆章

作者单位： 河南工业大学

项目金额： 20万元

中文摘要： 海洋大气环境下，氯离子侵蚀是混凝土结构耐久性退化的主要原因。目前研究海洋大气环境下氯离子的传输过程仍主要采用考虑环境因素修正的氯离子扩散模型。为此，通过探索性试验和理论分析，研究温度对混凝土中水分饱和度的影响关系，建立吸湿和排湿过程温度影响下不同相对湿度对应的饱和度平衡关系，然后根据多孔介质传输理论建立温湿度耦合传输模型。在热湿耦合传输模型中，引入考虑温度、饱和度等因素影响的氯离子扩散理论模型，建立温-湿-氯离子耦合传输的理论模型和数值模拟系统，然后对数值模拟系统进行试验验证，利用该模型进一步探讨海洋大气环境下温湿度对混凝土中氯离子传输速度的影响关系。模型考虑了温度和相对湿度的共同作用，能更准确预测和评估海洋大气环境下混凝土中氯离子侵入程度，为混凝土结构的寿命预测和评估以及新建结构耐久性设计提供必要的科学依据。

中文关键词： 服役寿命预测；预测模型；耐久性设计方法；长期性能；劣化机理

英文摘要： Under marine atmosphere environment, chloride ion erosion is the main cause of durability degradation for concrete structure. However, chloride ion transport process was still primarily researched by the modified chloride diffusion model for considering environmental factors. Therefore, the correlativity relation for temperature effecting water saturation in the concrete was established through the trial test and theoretical analysis. The equilibrium relationship between relative humidity and saturation with temperature effect was established, then a coupling transport model for considering temperature and humidity was proposed based on porous medium transport theory. According the temperature-humidity coupling transport model and the chloride ion diffusion theory model with consideration temperature, saturation and other factors influence, the corresponding temperature- humidity -chloride ion coupling transport theory model and numerical simulation system were established, then the numerical simulation system was verified by test and the chloride ion transport velocity in concrete under marine atmospheric environment for time varying temperature and humidity environment was discussed further by the numerical simulation system. For considering common function of temperature and relative humidity, the model can be more accurate to predict and evaluate intrusion degree for chloride ion in concrete under marine atmospheric environment. The life prediction of concrete structures under marine atmospheric environment, evaluation and new structure durability design can be provided the necessary scientific basis.

英文关键词： Service life prediction;Prediction model;Durability design method;Long-term behavior;Deterioration mechanism