The Assessment of Bond Strength between Corroded Steel Rebars and Self-Compacting Concrete

The bonding of steel bars to concrete in a various environments is one of the most significant problems in the durability of concrete structures. There are several different factors such as concrete ages and properties, steel rebars characteristics and environmental condition which affect the bond strength between concrete and embedded steel rebars. Accordingly, in the present study, the bond strength between embedded steel rebars and self-compacting concrete which contain different values of granite and limestone powder as a filer is investigated under accelerated corrosion condition. Besides, the specimens were also preloaded up to 50% of concrete compressive strength to investigate the effect of induced cracks caused by external loading on the chloride ions penetration and corrosion process. According to obtained results from the experiments, the utilization of 15% granite powder has increased the bond strength and decreased corrosion level of concrete specimens. Also, the loading of the specimens has exacerbated corrosion and reduced bond strength considerably.