Probabilistic Assessment of Reinforcing Steel Depassivation in Concrete under Aggressive Chloride Environments Based on Natural Exposure Data  

作　　者：张小刚 

机构地区：[1]College of Civil Engineering, Shenzhen University, Shenzhen Municipal Key Laboratory for Durability of Civil Engineering

出　　处：《Journal of Wuhan University of Technology(Materials Science)》2011年第1期126-131,共6页武汉理工大学学报（材料科学英文版）

基　　金：Funded by National Natural Science Foundation of China (Nos.50908148and 50925829);Research Project of Ministry of Housing and Urban-Rural Development of China (Nos.2009-K4-23, 2010-11-33);National KeyTechnologies R&D Program of China (No.2006BAJ02B04)

摘　　要：The probability distributions of the critical threshold chloride concentration Ccr, the chloride diffusion coefficient D, and the surface chloride concentration Cs are determined based on the collected natural exposure data, and the probability estimation of reinforcement depassivation in concrete is presented using Monte-Carlo simulation. From sensitivity analysis of mean value for ccr, cs, and D on the depassivation probability of reinforcement, it is found that ccr, cs, and D respectively has the greatest, smaller, and the lowest effect on the probability of depassivation. Finally the effect of stress state of concrete on the reinforcement depassivation probability is analyzed. It is found that the influence of stress state becomes apparent as exposure time increases.The probability distributions of the critical threshold chloride concentration Ccr, the chloride diffusion coefficient D, and the surface chloride concentration Cs are determined based on the collected natural exposure data, and the probability estimation of reinforcement depassivation in concrete is presented using Monte-Carlo simulation. From sensitivity analysis of mean value for ccr, cs, and D on the depassivation probability of reinforcement, it is found that ccr, cs, and D respectively has the greatest, smaller, and the lowest effect on the probability of depassivation. Finally the effect of stress state of concrete on the reinforcement depassivation probability is analyzed. It is found that the influence of stress state becomes apparent as exposure time increases.

关 键 词：probability of reinforcement depassivation natural exposure data stress state chloride diffusion coefficient critical threshold chloride concentration surface chloride concentration 

分 类 号：TU375[建筑科学—结构工程] O211.3[理学—概率论与数理统计]