文献类型：期刊文献

英文题名：The vertical Non-uniform corrosion of Reinforced concrete exposed to the marine environments

作者：Hu, Jiezhen[1,2];Deng, Peichang[3];Li, Xiaogang[2];Zhang, Jibiao[3];Wang, Gui[1]

机构：[1]Ocean Univ Guangdong, Coll Mech & Power Engn, Zhanjiang 524088, Peoples R China;[2]Univ Sci & Technol Beijing, Corros & Protect Ctr, Beijing 100083, Peoples R China;[3]Ocean Univ Guangdong, Coll Chem & Environm, Zhanjiang 524088, Peoples R China

年份：2018

卷号：183

起止页码：180

外文期刊名：CONSTRUCTION AND BUILDING MATERIALS

收录：SCI-EXPANDED(收录号：WOS:000440775300017)、、EI(收录号：20182605375360)、Scopus(收录号：2-s2.0-85048967229)、WOS

基金：The authors gratefully acknowledge financial support from National Basic Research Program of China (973 Program) (No. 2014CB643300), the Natural Science Foundation of Guangdong Province China (No. 2015A030313619), and Science and Technology Projects of Guangdong Province China (No. 2016A020225004).

语种：英文

外文关键词：Non-uniform corrosion; Reinforcement; Concrete; Marine environments; Carbonation; Chloride ion

外文摘要：Reinforced concrete (RC) structures usually are exposed to a wide variety of combined actions, which may cause various damages to the structures. The main objective of this study is to investigate the vertical non-uniform corrosion of reinforcement bar in concrete that was exposed to the marine environments. The concrete embedding rebar electrodes array (CRA) was designed and made based on the wire beam electrode (WBE). To simulate the submerged, tidal and splash marine environments, the marine environment simulation equipment (MESE) was set up. Electrochemical behaviors of rebar electrodes were characterized using the WBE method, linear polarization (LP) technique and electrochemical impedance spectroscopy (EIS). To monitor the carbonation and chloride ion penetration of concrete, the pH and chloride ion profiles of the concretes were analyzed. The vertical non-uniform corrosion of rebars was caused by the difference of oxygen concentration, moisture content, free chloride content and pH value in vertical direction. The macroscopic galvanic corrosion between the splash zone rebars and the tidal zone rebars was inhibited and the galvanic corrosion between the adjacent rebars was promoted by the high resistivity of the splash concrete. The concrete carbonation was a metathesis reaction between the bicarbonate ion (HCO3-) of seawater and the alkaline hydration products of concrete in the marine environments. (C) 2018 Published by Elsevier Ltd.