Bond Strength of Highly Corroded Reinforcement and Cover Delamination

Paper i proceeding, 2012

A recent experimental and analytical research program (Zandi et al., 2011-a, b) provided bond strength values for highly corroded bars. The test program included both main reinforcement and stirrup corrosion. These results must be compared to the rather wide but scattered database of test results in this field. Two relevant sources for comparison are the indications of FIB MC2010, based on the existing literature, and some recently published test results (Regan and Kennedy Reid, 2009). The latter simulated the delamination of the concrete cover by casting the concrete either flush to the bar surface or at mid-barrel i.e. the bars had either no cover or even were partly external to the concrete; the reinforcement was not corroded. The paper summarizes the tests by the authors and develops the comparison with the other studies. The conclusions discuss the choice of bond strength values for the assessment of existing structures and future research outlooks.