氯离子环境下钢筋混凝土结构的使用寿命预测

近年来,氯离子对混凝土结构的侵蚀已成为混凝土结构耐久性研究的重要内容,尤其是氯离子环境下钢筋混凝土结构的寿命预测问题更是科研工作者们普遍关注的问题.笔者介绍了氯离子环境下混凝土结构基于Fick第二定律寿命预测模型,并对模型中的相关参数进行修正,通过相关参数的改进,使该模型更能符合工程实际情况,从而能够更好的预测混凝土的服役寿命.另外,还介绍了钢筋混凝土结构使用寿命可靠度的概念及其理论计算方法,并从可靠性方面来讨论混凝土在氯离子环境下的服役寿命.

Life Prediction of the Concrete Structure Under Chloride Environment

In recent years,the chlorine ion erosion of concrete structures has become an important part of durability study of concrete structures.Researchers have paid close attention to the life prediction of reinforced concrete structures in chloride ion environment.In this paper,the model based on Fick′s second law for service life prediction of the steel-corroded concrete structures located in chlorine ion environment is introduced,and the related parameter is also modified to make the model agree with engineering practice better so that the service life can be predicted better.Moreover,the concept and the theoretical computation method of the life reliability of reinforced concrete structures are also presented in order that we can discuss the life of the concrete in chloride ion environment in terms of reliability.