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Predicting the time to corrosion initiation in reinforced concrete structures exposed to chlorides
Cement and Concrete Research ( IF 11.4 ) Pub Date : 2019-01-01 , DOI: 10.1016/j.cemconres.2018.08.007
Ueli M. Angst

Abstract Reliable predictions of the time to onset of corrosion in reinforced concrete are essential for service life modelling, to ensure sufficient durability, and for holistic sustainability assessments of new materials. All existing models are based on the same concept, that is, predicting the development over time of the chloride content at the level of the steel and comparing this numerical result with the critical chloride content for corrosion initiation, Ccrit. This paper presents example calculations utilizing input data derived from both laboratory specimens and from structures, illustrating the poor predictive power of state-of-the-art models. While it is generally assumed that improving chloride ingress models will improve the prediction of the time-to-corrosion, this paper shows that the bottle neck to more reliable predictions are rather i) the lack of fundamental understanding of corrosion initiation, ii) the use of non-representative laboratory results, and iii) ignoring the size-effect in localized corrosion.

中文翻译:

预测暴露于氯化物的钢筋混凝土结构的腐蚀开始时间

摘要 可靠地预测钢筋混凝土开始腐蚀的时间对于使用寿命建模、确保足够的耐久性以及新材料的整体可持续性评估至关重要。所有现有模型都基于相同的概念,即预测钢中氯化物含量随时间的发展,并将该数值结果与腐蚀开始的临界氯化物含量 Ccrit 进行比较。本文介绍了利用来自实验室样本和结构的输入数据的示例计算,说明了最先进模型的预测能力较差。虽然通常认为改进氯化物进入模型将改进对腐蚀时间的预测,
更新日期:2019-01-01
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