Residual bond strength in reinforced concrete cracked by expansion agent filled pipe simulating rebar corrosion
Residual bond strength in reinforced concrete cracked by expansion agent filled pipe simulating rebar corrosion
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模拟钢筋腐蚀的膨胀剂填充管道开裂钢筋混凝土的残余粘结强度
DOI：
10.1016/j.cscm.2022.e01565
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发表时间：
2022
影响因子：
6.2
通讯作者：
T.
中科院分区：
文献类型：
--
作者：
Syll;A.S.;Kanakubo;T.
在腐蚀的钢筋混凝土中，由于膨胀的腐蚀产物，钢筋的体积增加，导致混凝土开裂。结果，混凝土与钢筋之间的粘结能力逐渐降低。在此之前，作者探讨了由于腐蚀相关的开裂使用一种新的裂纹模拟方法的债券恶化。为了模拟钢筋由于腐蚀而产生的体积膨胀，将铝管插入混凝土中并填充膨胀剂。然而，以往的研究没有考虑箍筋的重要作用，提供限制和提高粘结强度。为了解决这一问题，对48个开裂试件进行了拉拔试验，以研究考虑裂缝宽度和裂缝宽度影响的粘结劣化。结果表明，不含锈蚀产物的诱导裂缝可以衡量钢筋本身锈蚀的唯一结果。在保护层开裂后，箍筋成为主要的约束源，有助于减少粘结劣化。最后，提出了以裂缝宽度和箍筋为主要参数的粘结强度退化经验公式。与各种腐蚀试件的实验结果的比较证实，所提出的公式可以给出令人满意的预测。
In corroded reinforced concrete, the volume of steel increases due to expansive corrosion products, leading to cracking of concrete. As a result, the bond capacity between concrete and rebar gradually decreases. Previously, the author explored bond deterioration owing to corrosion-related cracking using a novel crack simulation approach. To simulate the volumetric expansion of the rebar due to corrosion, an aluminum pipe is inserted into the concrete and filled with an expansion agent. However, the previous study did not consider the important effect of stirrups that provide confinement and improve bond strength. To address this limitation, pull-out tests were performed on 48 cracked specimens to investigate bond deterioration considering the influence of crack width and stirrup. It is concluded that the induced cracks without corrosion products can measure the exclusive result of corrosion of the rebar itself. After cover cracking, stirrups become the primary confinement source and can help reduce bond deterioration. Finally, an empirical formula was proposed to evaluate the bond strength degradation with induced crack width and stirrups being the main parameters. Comparisons with various experimental results of corroded specimens confirm that the proposed formula can give satisfactory predictions.
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DOI：
10.1617/s11527-006-9096-x
发表时间：
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期刊：
影响因子：
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