Effects of Rust and Scale of Reinforcing Bars on the Bond Performance of Reinforcement Concrete
Publication: Journal of Materials in Civil Engineering
Volume 26, Issue 4
Abstract
To investigate the effect of reinforcement corrosion on the bond properties between concrete and reinforcing steel bar, pullout tests were conducted on a total of 20 specimens using corroded reinforcement bars embedded in concrete specimens. No. 3 (9.5-mm diameter) and No. 6 (19-mm diameter) bars corroded by an accelerated corrosion method were selected for testing. Two groups of corrosion specimens were prepared: one was whole-surface corroded (100%), and the other was partial-surface corroded with 40, 60, and 100% corrosion. Each group of specimens included four levels of corrosion: 3, 5, 10, and 15%. Results indicate that the tensile strength of steel bar decreases with the increase of corrosion level. Corrosion levels less than 3% present a minor tensile-strength reduction of approximately 3%, whereas the tensile strength may decrease to 75–90% when the corrosion level increases more than 10%. The critical bond strength and ultimate bond strength of corroded bars may increase slightly with corrosion level less than 3%, but tend to decrease as the corrosion level exceeds 3% and, likewise, to decrease with increasing corroded-surface percentage of steel bar. The range of partial-surface corrosion shows no significant effect on yield strength and ultimate strength of the steel bar. However, the critical bond strength and ultimate bond strength in a reinforcing steel bar decrease with the percentage of corroded surface for various corrosion levels when the corroded area increases from 40–100%.
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Acknowledgments
This research was supported by the National Science Council, Republic of China (ROC), under Grant NSC 97-2221-E-122-005.
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Information & Authors
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Published In
Journal of Materials in Civil Engineering
Volume 26 • Issue 4 • April 2014
Pages: 576 - 581
Copyright
© 2012 American Society of Civil Engineers.
History
Received: Nov 19, 2011
Accepted: Oct 9, 2012
Published online: Oct 11, 2012
Discussion open until: Mar 11, 2013
Published in print: Apr 1, 2014
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