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通过电化学阻抗谱(electrochemical impedance spectroscopy,EIS)与X射线断层扫描技术(X-ray computed tomography,X-CT),研究了电迁移氯盐加速混凝土内钢筋的腐蚀行为及钢筋-混凝土界面区的腐蚀特征。结果表明:电迁移15d后钢筋已经开始腐蚀,电迁移60d后钢筋腐蚀较严重;与混凝土基体相比,钢筋-混凝土界面区的气孔与微裂缝等缺陷处表现出较低的灰度值;钢筋-混凝土界面区的缺陷会利于Cl-诱发钢筋腐蚀,同时也能容纳更多腐蚀扩展期的腐蚀产物;EIS与X-CT的结合能够无损检测混凝土中钢筋的腐蚀行为。
Electrochemical impedance spectroscopy (EIS) and X-ray computed tomography (X-CT) were used to investigate the corrosion behavior of steel bar in electrochemically-accelerated chloride-accelerated concrete and the influence of the interface between the steel and concrete Corrosion characteristics. The results show that the rebar has started to corrode 15 days after electromigration, and the corrosion of the rebar is serious after 60 days electroporation. Compared with the concrete matrix, the defects such as porosity and micro-cracks in the rebar-concrete interfacial zone show lower gray values. - Defects in the concrete interface zone favor the Cl-induced corrosion of the rebar and also allow for more corrosion products during corrosion propagation; the combination of EIS and X-CT can nondestructively detect the corrosion behavior of rebar in concrete.