Study on the effects of bonded-stress between concrete and corroded rebar

Abstract

In this study, the bond stress between steel bar with a diameter of 12mmand concrete was examined with the effect of different corrosion levels and different concrete grades. A steel bar was inserted in a concrete block with a size of 20x20x20cm. The compressive strength of concrete was 25.6MPa, 35.1MPa, and 44.1MPa. These specimens were soaked into solution NalCl3.5% to accelerate the corrosion process at a different time and corrosion levels. The pull-out test was conducted. Results showed that the bond strength of the corroded steel bar was higher than that predicted from CEB-FIP [1]. Slip displacement and the range of slip displacement at the bond strength were reduced when the concrete compressive strength was increased.