湿热环境下混凝土氯离子的输运模型研究及寿命预测

Transport Model and Life Prediction of Chloride in Concrete under Hot and Humid Environment

摘要: 我国南海和东海南部地区混凝土结构，常年处于高温、高湿、高盐度的腐蚀环境下，严重地损害了结构的使用寿命。本文在菲克第二定律的基础上，建立了湿热耦合环境下氯离子的输运模型；采用临界氯离子浓度和钢筋锈蚀宽度作为寿命评估指标，计算了混凝土结构的使用寿命。本文对某跨海大桥的耐久性寿命进行了具体的预测。结果表明：本文建立的湿热耦合环境下氯离子的输运模型可以为相关环境下的混凝土结构耐久性寿命预测提供有益的参考。

Abstract: The concrete structure in the South Sea and the south areas of East Sea is in a high temperature, high humidity and high salinity corrosion environment, which seriously damages the service life of the structure. The transport model of chloride is established based on Fick’s second law under hot and humid coupling environment. The service life of concrete structure is calculated by using the critical chloride concentration and corrosion width of the steel bar as the evaluation index. The durability life of a cross-sea bridge is predicted in this paper. The results show that the transport model of chloride under the humid hot and humid coupling environment can provide a useful reference for the durable life prediction of the concrete structure.