X‐ray Radiography to Visualize the Rebar–Cementitious Matrix Interface and Judge the Delay in Corrosion through Self‐Repair by Encapsulated Polyurethane,Advanced Materials Interfaces

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X‐ray Radiography to Visualize the Rebar–Cementitious Matrix Interface and Judge the Delay in Corrosion through Self‐Repair by Encapsulated Polyurethane
Advanced Materials Interfaces ( IF 4.3 ) Pub Date : 2017-12-11 , DOI: 10.1002/admi.201701021
Kim Van Tittelboom ₁ , Bjorn Van Belleghem ₁ , Matthieu N. Boone ₂ , Luc Van Hoorebeke ₂ , Nele De Belie ₁

Affiliation

Corrosion of steel reinforcement is one of the most detrimental attack mechanisms for reinforced concrete structures. The presence of cracks, which are inextricably linked to reinforced concrete, accelerates this attack mechanism. The aim of this study is to heal cracks by an autonomous mechanism, which is triggered upon crack appearance. With an accelerated corrosion test on mortar samples with embedded reinforcement bars, it is shown that the presence of cracks indeed accelerates the onset and propagation of corrosion at the interface between the rebar and the cementitious matrix. Moreover, it is shown that crack healing in both the traditional, manual way and the proposed autonomous way, with an encapsulated one‐component polyurethane, delays the onset and propagation of corrosion. The difference in corrosion behavior is proven by visual evaluation of the rebar surface and by X‐ray radiographic analysis, which is proposed as a successful technique to evaluate the crack healing efficiency and more specifically the potential to delay corrosion.

中文翻译：

X射线照相术可可视化钢筋水泥基体界面，并通过封装的聚氨酯通过自我修复来判断腐蚀延迟

钢筋的腐蚀是钢筋混凝土结构最有害的侵蚀机制之一。与钢筋混凝土密不可分的裂缝的出现加速了这种侵蚀机制。这项研究的目的是通过一种自主机制来修复裂缝，这种机制是在出现裂缝时触发的。通过对带有嵌入式钢筋的砂浆样品进行的加速腐蚀测试，结果表明，裂纹的存在确实加速了钢筋与水泥基体之间界面处腐蚀的发生和蔓延。此外，结果表明，采用密封的单组分聚氨酯，以传统的，手动的方式和建议的自主方式进行的裂纹修复均会延迟腐蚀的发生和传播。

更新日期：2017-12-11

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