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Advances in Civil Engineering
Volume 2017, Article ID 8205081, 11 pages
https://doi.org/10.1155/2017/8205081
Research Article

Bond Effects between Concrete and Steel Bar Using Different Diameter Bars and Different Initial Crack Width

1School of Transportation Science and Engineering, Beihang University, Beijing 100191, China
2State Laboratory of Subtropical Building Science, South China University of Technology, Guangzhou 510640, China

Correspondence should be addressed to Papa Niane Faye; moc.liamtoh@eyafrukahs

Received 4 February 2017; Accepted 16 March 2017; Published 2 April 2017

Academic Editor: Peng Zhang

Copyright © 2017 Papa Niane Faye et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The importance of an accurate simulation of service conditions in the bond performance of reinforced concrete structures in coastal regions is highlighted. Four widths of initial crack of 0, 80, 150, and 210 microns were artificially made by inserting slice into bond specimens during concrete casting. Three bar diameters of 10 mm, 14 mm, and 18 mm were selected. At 28 days, the bond specimens were exposed to the environment of wet-dry cycles of seawater and atmosphere for another 90 days. The pull-out test was then conducted and chloride contents were tested at crack area along 40 mm depth. Results show that, for the specimen with 10 mm bar diameter, cracks width of less than 80 microns vanished rapidly during wet-dry cycles; for other specimens, cracks width of 100–150 microns decreased slightly. However the cracks of width more than 200 microns increased gradually; the chloride content decreased along the depth of concrete, and the chloride content increased as the widths of initial cracks increased or as the bar diameters increased. The ductility of bond specimens decreased as the diameter increased.