Influence of Corrosion on Bond Behavior of Reinforcement Bars


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Title: Influence of Corrosion on Bond Behavior of Reinforcement Bars

Author(s): Y. Auyeung, P. Balaguru, and L. Chung

Publication: Special Publication

Volume: 193


Appears on pages(s): 1051-1074

Keywords: bar; bond; corrosion; slip; strength

Date: 8/1/2000

Experimental results of the bond behavior of 10, 13, 19, and 25-mm diameter bars corroded to various levels are presented. A total of forty specimens were tested to obtain the bond - slip behavior. The corrosion level ranged from 0 to 4.79 percent diameter loss. Externally applied current was used to induce controlled amount of corrosion. The results were analyzed to study the influence of bar diameter and corrosion level on bond strength, slip at peak load, and overall bond - slip behavior. The results indicate that exponential reduction in bond strength occurs once the diameter loss exceeds a fraction of a millimeter. At a diameter loss of O.l-mm, the strength reductions are substantial. The reduction in slip at maximum load is even more significant with corrosion. The actual magnitude of corrosion can be predicted using the applied current input with reasonable accuracy.