The purpose of this paper is to examine the bond slip performance of corroded small diameter reinforcing bars in concrete and double pull tests were carried out on specimens in which small diameter reinforcing bars corroded by electrolytic corrosion were embedded in concrete. From the strain distribution of reinforcing bars, the relationships between bond stress(τ) and slip(S) were delived and the effe ct of slip of reinforcing , amount of corrosion and crack width occurred on concrete surface on maximum bond strength were obtained.
The results obtained are as shown below.
1. The τ S relationship of corroded reinforcing bars is significantly different from the case where reinforcing bars are not corroded
2. In the case of corroded reinforcing bar the initial bond rigidity is high and it reaches τmax with smaller slip.
3.The value of τmax is highly correlated with the corrosion crack width.
