【摘要】 缩短钢筋混凝土结构使用寿命的主要原因之一是氯离子对混凝土的扩散侵蚀。研究各种因素对氯离子扩散的影响,准确预测氯离子侵蚀程度是修复和加固钢筋混凝土结构的重要依据。作者基于Fick第二定律,推导出混凝土氯离子综合机制扩散迁移模型,确定了温度、时间、混凝土结合作用以及结构劣化效应与氯离子扩散系数之间的关系,并对各种影响机制的内在相关性和重要性进行了敏感性分析。经过工程实验验证,证明了改进后的氯离子扩散迁移模型的正确性和合理性。更多还原

【Abstract】 One of the major causes of reduction of serve life of reinforced concrete structures is chloride diffusion in the structures where corrosion of the reinforcing steel occurs. The study of influencing mechanisms of chloride diffusion and the accurate evaluation of chloride incursion are the important gist of the repair and reinforcing of the reinforced concrete structure. Based on Fick’s second law of diffusion, this paper developed a theoretical multi-mechanism diffusion and transport model of chloride ion and considered the relation between chloride diffusion coefficient and mechanisms, such as time, temperature, micro-defect and binding effect of concrete. The sensitivity of inherent relativity and roles of the various mechanisms are analyzed. In addition, the application of this diffusion and transport model is verified with experimental and engineering data.更多还原