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Title: Application of wire beam electrode technique to investigate initiation and propagation of rebar corrosion

Abstract

Multi-electrode technique named as wire beam electrode (WBE) was used to study pitting corrosion of rebar under concrete cover. When WBE embedded mortar sample was immersed in NaCl solution, uneven distributions of galvanic current and open circuit potential (OCP) on the WBE were observed due to the initiation of pitting corrosion. The following oxygen depletion in mortar facilitated the negative shift of the OCP and the smoothing of the current and potential distributions. Wetting–drying cycle experiments showed that corrosion products instead of oxygen in wet mortar specimen sustained the propagation of pitting corrosion due to Fe (III) taking part in cathodic depolarization during oxygen-deficient wet period, which was confirmed by micro-Raman spectroscopy. In addition, new pitting corrosion occurred mainly near the corrosion products, leading to preferentially horizontal propagation of rust layer on the WBE. A localized corrosion factor was further presented to quantify the localised corrosion based on galvanic current maps.

Authors:
; ;
Publication Date:
OSTI Identifier:
22220798
Resource Type:
Journal Article
Journal Name:
Cement and Concrete Research
Additional Journal Information:
Journal Volume: 48; Other Information: Copyright (c) 2013 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0008-8846
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ACCELERATION; CONCRETES; CORROSION PRODUCTS; DEPOLARIZATION; DISTRIBUTION; ELECTRODES; LAYERS; MORTARS; OXYGEN; PITTING CORROSION; RAMAN SPECTROSCOPY

Citation Formats

Shi, Wei, Dong, Ze Hua, E-mail: zehua.dong@gmail.com, Kong, De Jie, and Guo, Xing Peng. Application of wire beam electrode technique to investigate initiation and propagation of rebar corrosion. United States: N. p., 2013. Web. doi:10.1016/J.CEMCONRES.2013.02.009.
Shi, Wei, Dong, Ze Hua, E-mail: zehua.dong@gmail.com, Kong, De Jie, & Guo, Xing Peng. Application of wire beam electrode technique to investigate initiation and propagation of rebar corrosion. United States. https://doi.org/10.1016/J.CEMCONRES.2013.02.009
Shi, Wei, Dong, Ze Hua, E-mail: zehua.dong@gmail.com, Kong, De Jie, and Guo, Xing Peng. 2013. "Application of wire beam electrode technique to investigate initiation and propagation of rebar corrosion". United States. https://doi.org/10.1016/J.CEMCONRES.2013.02.009.
@article{osti_22220798,
title = {Application of wire beam electrode technique to investigate initiation and propagation of rebar corrosion},
author = {Shi, Wei and Dong, Ze Hua, E-mail: zehua.dong@gmail.com and Kong, De Jie and Guo, Xing Peng},
abstractNote = {Multi-electrode technique named as wire beam electrode (WBE) was used to study pitting corrosion of rebar under concrete cover. When WBE embedded mortar sample was immersed in NaCl solution, uneven distributions of galvanic current and open circuit potential (OCP) on the WBE were observed due to the initiation of pitting corrosion. The following oxygen depletion in mortar facilitated the negative shift of the OCP and the smoothing of the current and potential distributions. Wetting–drying cycle experiments showed that corrosion products instead of oxygen in wet mortar specimen sustained the propagation of pitting corrosion due to Fe (III) taking part in cathodic depolarization during oxygen-deficient wet period, which was confirmed by micro-Raman spectroscopy. In addition, new pitting corrosion occurred mainly near the corrosion products, leading to preferentially horizontal propagation of rust layer on the WBE. A localized corrosion factor was further presented to quantify the localised corrosion based on galvanic current maps.},
doi = {10.1016/J.CEMCONRES.2013.02.009},
url = {https://www.osti.gov/biblio/22220798}, journal = {Cement and Concrete Research},
issn = {0008-8846},
number = ,
volume = 48,
place = {United States},
year = {Sat Jun 15 00:00:00 EDT 2013},
month = {Sat Jun 15 00:00:00 EDT 2013}
}