Effect of corrosion‐induced crack and corroded rebar shape on bond behavior
Effect of corrosion‐induced crack and corroded rebar shape on bond behavior
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DOI：
10.1002/suco.201800313
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发表时间：
2019-03
影响因子：
3.2
通讯作者：
Yizhou Yang;Hikaru Nakamura;T. Miura;Yoshihito Yamamoto
中科院分区：
文献类型：
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作者：
Yizhou Yang;Hikaru Nakamura;T. Miura;Yoshihito Yamamoto
本文旨在研究锈蚀裂缝、锈蚀钢筋形状和钢筋周围锈蚀对钢筋混凝土（RC）构件粘结性能的影响。首先，用加速电腐蚀法对试样进行腐蚀，腐蚀程度从0到25%不等。将测试样本分成不同的组。对于正常腐蚀组，在腐蚀试验后直接进行粘结试验，以研究腐蚀引起的裂缝、腐蚀钢筋形状和锈蚀对粘结劣化的综合影响。另一组为将锈蚀钢筋从试件中取出后，先除锈再浇筑成新混凝土，以评价锈蚀钢筋形状的单一效应。同样，锈蚀钢筋与锈浇铸成新的混凝土，以评估锈蚀的形成对债券退化的影响。试验结果定量地说明了锈蚀程度、锈蚀裂缝宽度和锈蚀钢筋几何形状等因素对锈蚀的影响。作为重要的发现，混凝土中的腐蚀裂缝被认为是一个更主导的因素比腐蚀钢筋的形状和锈蚀积累的粘结劣化机制。锈层的积累有助于改善钢筋锈蚀引起的粘结性能劣化。
This paper aims to investigate the individual effect of corrosion‐induced crack, corroded rebar shape, and rust around rebar on the bond properties of reinforced concrete (RC) members. First, test specimens were corroded by accelerated electric corrosion method with varying corrosion degree ranging from 0 to 25%. Test specimens were divided into different groups. For the normal corrosion group, bond test was conducted directly after the corrosion test to investigate the combined effects including corrosion‐induced crack, corroded rebar shape, and rust on bond deterioration. In another group, after corroded rebar was taken out from test specimen, rust was removed before casted into new concrete to evaluate single effect of corroded rebar shape. Similarly, corroded rebar with rust was casted into new concrete to evaluate the effect of the formation of rust on bond degradation. Experimental results quantitatively illustrate the influential factors including corrosion degree, corrosion crack width and geometry of corroded rebar. As the important finding, corrosion crack in concrete is concluded to be a more dominant factor than the corroded rebar shape and rust accumulation in bond deterioration mechanism. Moreover, rust accumulation contributes to the improvement of bond deterioration induced by corroded rebar shape.