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Monitoring Corrosion of Reinforced Concrete Beams in a Chloride Containing Environment under Different Loading Levels

Wei, A, Wang, Y and Tan, Y (2015) Monitoring Corrosion of Reinforced Concrete Beams in a Chloride Containing Environment under Different Loading Levels Structural Monitoring and Maintenance, 2 (3). pp. 253-267.

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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.

Item Type: Article
Subjects : Civil & Environmental Engineering
Divisions : Faculty of Engineering and Physical Sciences > Civil and Environmental Engineering
Authors :
Date : 1 September 2015
Identification Number : 10.12989/smm.2015.2.3.253
Copyright Disclaimer : Copyright 2015 Techno-Press
Additional Information : Full text not available from this repository.
Depositing User : Symplectic Elements
Date Deposited : 06 Sep 2016 18:07
Last Modified : 06 Sep 2016 18:07

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