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Chloride diffusion and time to corrosion initiation of reinforced concrete structures
Magazine of Concrete Research ( IF 2.7 ) Pub Date : 2021-01-04 , DOI: 10.1680/jmacr.19.00276
Jianxin Peng 1 , Huang Tang 2 , Linfa Xiao 3 , Xiaokang Cheng 4 , Jianren Zhang 1
Affiliation  

The diffusion mechanism for chloride ions in concrete with varying water/cement ratio (w/c) is studied by chloride ion spray testing. A new model of chloride diffusion coefficient, which varies with the ingress depth of chloride ion and w/c, is developed. A spatial time-dependent reliability model of time to corrosion initiation (TCI) for reinforced concrete (RC) structures is developed, considering spatial variability of geometric, material and environmental parameters. The test results show that the chloride diffusion coefficient increases as w/c increases, and chloride diffusion velocity decreases as penetration depth increases. It is found that the probability of corrosion initiation considering spatial variability is 13.1–18.5% greater than that without consideration of spatial variability. This indicates that neglecting spatial variations in evaluating probability of corrosion initiation time overestimates the structural reliability. It is also found that the probability of corrosion initiation for future climate change is 9–11% higher than that obtained from constant temperature. The mean value of TCI based on a time-dependent chloride diffusion coefficient is 16.7% less than that obtained for a constant chloride diffusion coefficient. This suggests that it is more appropriate if penetration depth and w/c is considered when determining the time-dependent chloride diffusion coefficient.

中文翻译:

钢筋混凝土结构的氯化物扩散和腐蚀开始时间

通过氯离子喷雾试验研究了氯离子在不同水灰比(w / c)的混凝土中的扩散机理。开发了一种新的氯离子扩散系数模型,该模型随氯离子进入深度和w / c 变化。考虑到几何、材料和环境参数的空间可变性,开发了钢筋混凝土 (RC) 结构腐蚀开始时间 ( T CI )的空间时间相关可靠性模型。测试结果表明氯化物扩散系数随着w / c的增加而增加增加,氯化物扩散速度随着渗透深度的增加而降低。发现考虑空间变异性的腐蚀开始概率比不考虑空间变异性的概率高 13.1-18.5%。这表明在评估腐蚀开始时间的概率时忽略空间变化会高估结构可靠性。还发现未来气候变化引发腐蚀的概率比恒温获得的概率高 9-11%。的平均值Ť CI基于与时间相关的氯离子扩散系数比对于恒定的氯离子扩散系数获得少16.7%。这表明如果穿透深度和w /在确定与时间相关的氯化物扩散系数时考虑c
更新日期:2021-01-04
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