Bond characteristics of corroding reinforcement in concrete beams

MANGAT, P. and ELGARF, M. S. (1999). Bond characteristics of corroding reinforcement in concrete beams. Materials and structures, 32 (216), 89-97.

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The results of an experimental study of the bond characteristics of reinforced concrete beams subjected to reinforcement corrosion are presented. Beam specimens recommended by the joint RILEM/CEB/FIP Committee were used, which comprised two halves of a reinforced concrete beam rotating about a hinge mechanism. Corrosion was induced at different levels of rebar diameter loss: 0, 0.3, 0.4, 0.5, 1, 2 and 5 percent by impressing direct current of intensity 0.8 and 2.4 mA/cm(2). The specimens were tested under four point bending to induce bond failure and load - free end slip curves were plotted. The tests showed that at up to 0.4% degree of corrosion, no free-end slip occurred in the reinforcement bars until complete breakdown of bond at failure. At higher degrees of reinforcement corrosion, free-end slip commenced immediately upon application of load and increased linearly with increasing load. The free-end slip at maximum load was a function of the degree of reinforcement corrosion. At small degrees of corrosion, the bond strength increased with increasing degree of corrosion, showing a maximum increase of over 25% at 0.4% corrosion. Higher degrees of corrosion led to a sharp decrease in bond strength.

Item Type: Article
Research Institute, Centre or Group - Does NOT include content added after October 2018: Materials and Engineering Research Institute > Structural Materials and Integrity Research Centre > Centre for Infrastructure Management
Identification Number:
Page Range: 89-97
Depositing User: Ann Betterton
Date Deposited: 04 Feb 2010 15:54
Last Modified: 18 Mar 2021 09:30

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