Corrosion performance of reinforcing steel in concrete under simultaneous flexural load and chlorides attack. (15th September 2017)

• Record Type: Journal Article
• Authors: Shi, Jinjie; Ming, Jing; Sun, Wei; Zhang, Yamei
• Is Part Of: Construction & building materials. Volume 149(2017)
• Page Start: 315
• Page End: 326
• Publication Date: 2017-09-15
• Subjects: Steel reinforced concrete -- Flexural load -- Chlorides -- Corrosion resistance -- EIS -- Corrosion pattern; Building materials -- Periodicals; 624.18
• DOI: 10.1016/j.conbuildmat.2017.05.092
• Languages: English
• ISSNs: 0950-0618

Abstract

Highlights: The corrosion rate of steels is increased gradually with increasing stress ratio. The probability of pitting corrosion with 0.5 stress ratio is higher than 0.3 stress ratio. Steel corrosion behavior in tidal zone is very sensitive to stress ratio. The tensile stress is the dominating factor affecting steel corrosion. Abstract: In this study, the corrosion behavior of reinforcing steels in concrete under simultaneous flexural load and chlorides attack was studied by means of linear polarization resistance (LPR), electrochemical impedance spectroscopy (EIS) and cyclic potentiodynamic polarization (CPP) measurements. The influence of different stress ratios and exposure zones in marine environments on uniform corrosion resistance and pitting corrosion resistance of steels was analyzed. Moreover, different corrosion patterns were observed for the top part and bottom part of steels according to the casting direction. It was proposed that the tensile stress effect and the possible steel-concrete interfacial defects are mainly responsible for this difference.