Monitoring corrosion of reinforced concrete beams in a chloride containing environment under different loading levels

Wei, Aifang, Wang, Ying and Tan, Mike Y.J. 2015, Monitoring corrosion of reinforced concrete beams in a chloride containing environment under different loading levels, Structural monitoring and maintenance, vol. 2, no. 3, pp. 253-267, doi: 10.12989/smm.2015.2.3.253.

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Title Monitoring corrosion of reinforced concrete beams in a chloride containing environment under different loading levels
Author(s) Wei, Aifang
Wang, Ying
Tan, Mike Y.J.ORCID iD for Tan, Mike Y.J.
Journal name Structural monitoring and maintenance
Volume number 2
Issue number 3
Start page 253
End page 267
Total pages 15
Publisher Techno-Press
Place of publication Daejeon, Korea
Publication date 2015
ISSN 2288-6605
Keyword(s) corrosion
reinforced concrete beams
lectrochemical devices
galvanic current
Summary Corrosion has significant adverse effects on the durability of reinforced concrete (RC) structures, especially those exposed to a marine environment and subjected to mechanical stress, such as bridges, jetties, piers and wharfs. Previous studies have been carried out to investigate the corrosion behaviour of steel rebar in various concrete structures, however, few studies have focused on the corrosion monitoring of RC structures that are subjected to both mechanical stress and environmental effects. This paper presents an exploratory study on the development of corrosion monitoring and detection techniques for RC structures under the combined effects of external loadings and corrosive media. Four RC beams were tested in 3% NaCl solutions under different levels of point loads. Corrosion processes occurring on steel bars under different loads and under alternative wetting - drying cycle conditions were monitored. Electrochemical and microscopic methods were utilised to measure corrosion potentials of steel bars; to monitor galvanic currents flowing between different steel bars in each beam; and to observe corrosion patterns, respectively. The results indicated that steel corrosion in RC beams was affected by local stress. The point load caused the increase of galvanic currents, corrosion rates and corrosion areas. Pitting corrosion was found to be the main form of corrosion on the surface of the steel bars for most of the beams, probably due to the local concentration of chloride ions. In addition, visual observation of the samples confirmed that the localities of corrosion were related to the locations of steel bars in beams. It was also demonstrated that electrochemical devices are useful for the detection of RC beam corrosion.
Language eng
DOI 10.12989/smm.2015.2.3.253
Field of Research 090506 Structural Engineering
Socio Economic Objective 970109 Expanding Knowledge in Engineering
HERDC Research category C2 Other contribution to refereed journal
ERA Research output type C Journal article
Copyright notice ©2015, Techno-Press
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