Influence of corrosion on the bond strength of steel rebars in concrete
Influence of corrosion on the bond strength of steel rebars in concrete
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DOI：
10.1617/s11527-014-0518-x
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发表时间：
2016-01-01
影响因子：
3.8
通讯作者：
Rinaldi, Zila
中科院分区：
文献类型：
--
作者：
Coccia, Simona;Imperatore, Stefania;Rinaldi, Zila
在过去的几十年里，钢筋混凝土结构的耐久性问题急剧出现，这表明最危险的退化现象之一与钢筋腐蚀有关。当活性腐蚀增长时，氧化物的体积约为条形条的2-4倍，导致粘结损失、开裂和覆盖层剥落。本文分析了钢-混凝土界面处的腐蚀效应。为此，进行了不同腐蚀水平下的拉拔试验，以确定损伤钢筋的粘结-滑移本构关系。此外，开发了一个分析模型，用于评估由于腐蚀产物引起的内压，对于没有箍筋的混凝土试件，为了提供一个程序来定义最大粘结作为腐蚀百分比的函数。最后通过与实验结果的对比，验证了分析结果。
The problem of the durability of reinforced concrete structures is arisen, dramatically, in the last decades, showing that one of the most dangerous degradation phenomena is connected to the rebars corrosion. When active corrosion grows the oxides occupy a volume of about 2-4 times, with respect to the sound bar, causing a loss of bond, cracking and cover spalling. In this paper the corrosion effects at the steel-concrete interface are analysed. At this aim, pull-out tests are carried out, with different corrosion levels, for the definition of the bond-slip constitutive relationships of the damaged rebars. Furthermore, an analytical model is developed for evaluating the internal pressure due to corrosion products, for concrete specimens without stirrups, in order to provide a procedure for the definition of the maximum bond as a function of the corrosion percentage. Finally the analytical results are validated through a comparison with the experimental outcomes.