钢筋混凝土氯离子时变扩散及起始锈胀时变可靠度研究被引量：1

Time-dependent chloride diffusion and time-dependent initial corrosion reliability in reinforced concrete

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摘要采用氯离子传感器(Mn O2电极为参比电极,Ag/Ag Cl为工作电极)测量混凝土中氯离子浓度,反演氯离子时变扩散系数幂函数模型,在此基础上研究钢筋混凝土起始锈胀时变可靠度和随机变量敏感性。研究结果表明:所研制的氯离子传感器电位与氯离子浓度有良好线性关系,反演得到的氯离子时变扩散系数随时间增加而减小;采用氯离子时变扩散系数所得的时变失效概率小于氯离子恒定扩散系数所得的时不变失效概率;钢筋保护层厚度对起始锈胀敏感度影响最大,氯离子扩散系数次之;氯离子时变扩散系数速率指数及其收敛值对起始锈胀敏感度影响较大。研究结果对钢筋混凝土起始锈胀时变可靠度预测具有参考作用。 The embedded chloride sensors with respect to MnO2 reference electrode and Ag/AgC1 working electrode were embedded in concrete block soaked in concrete synthetic solution to do the chloride ion diffusion experiment. The powerful function model of time-dependent chloride ion diffusion coefficient in concrete was inversed, and the time-dependent failure probability of initial corrosion of reinforced concrete was predicted and the sensitivity of corresponding variances was analyzed. The results show that the potential of chloride sensor with respect to MnO2 is linear with the chloride concentration, and the time-dependent chloride diffusion coefficient decreases with the increase of time. The probability of initial corrosion by the time-dependent chloride diffusion coefficient is lower than that by the time-independent, the initial corrosion sensitivity of time-dependent chloride diffusion coefficient iS less than that of cover, and the effect of the velocity index and convergence value of chloride diffusion coefficient on the initial corrosion sensitivity increases. The results can be referred when the initial corrosion reliability of reinforced concrete is predicted.

作者樊玲李江腾卢文平彭述权赵军华

机构地区中南大学资源与安全工程学院长江水利委员会长江科学院

出处《中南大学学报（自然科学版）》 EI CAS CSCD 北大核心 2015年第3期1043-1049,共7页 Journal of Central South University:Science and Technology

基金长江科学院开放研究基金资助项目(CKWV2013210/KY) 国家自然科学基金资助项目(51374246) 长沙市科技计划项目(K1403047-11)~~

关键词埋入式氯离子传感器氯离子时变扩散系数钢筋混凝土起始锈胀时变可靠度敏感性 embedded chloride sensors time-dependent chloride diffusion coefficient reinforced Concrete initialcorrosion time-dependent reliability sensitivity

分类号 TU375 [建筑科学—结构工程]

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