To investigate the influence of specimen size on bond performance between corroded reinforcing steel bars and concrete

three cube specimens of different dimensions were cast with 10D length per side

where D is the diameter of longitudinal rebars (D=14 mm

20 mm

25 mm). Pull-out specimens with reinforcement mass loss percentage of 0%

0.5%

1.0%

2.0%

5.0%

8.0%

and 10.0% were obtained using current accelerated method. The variation laws of bond characteristics were analyzed considering the influence of reinforcement corrosion ratio and specimen size. The experimental results show that the expansive cracks appeared earlier and the maximum crack width was larger as the dimensions of specimens increased. The bond strength and the initial bond stiffness first increased and then gradually decreased as the concrete deterioration and reinforcement corrosion levels increased for specimens of different dimensions

and the bond energy dissipation decreased as the mass loss of reinforcement increased

whereas the specimen with larger diameter (D=25 mm) was more sensitive to the corrosion than that of the specimen with smaller diameter (D=14 mm

20 mm). Moreover

the free-end slip and the bond energy dissipation for specimens of different dimensions decreased slowly before the corrosion-induced cracks appeared

and then decreased rapidly when the corrosion-induced cracks appeared

which had no significant effects on corrosion level after the corrosion-induced cracks appeared. Based on the experimental results

the empirical model of the residual bond stress between corroded rebar and concrete was proposed

which can evaluate the residual bond strength with different diameter of reinforcement.