| Title |
Bond Performance of Corroded Bars Before and After Concrete Casting in the Reinforced Concrete Flexural Members |
| Authors |
Chung Lan ; Cho Seung-Ho ; Roh Young-Sook |
| Keywords |
부식 ; 타설 전 부식 ; 타설 후 부식 ; 타설 후 부식 ; 부착강도 ; 내구성부식 ; 타설 전 부식 ; 타설 후 부식 ; 타설 후 부식 ; 부착강도 ; 내구성 |
| Abstract |
In order to understand the effect of corrosion on the bond strength in RC flexural members, reinforcing bars are corroded before and after concrete casting using current-induced accelerated technique. In pre-corroded reinforcing bars, the average bond strength tended to increase until 3% of actual corrosion level and then started to decrease after 3 ％ of corrosion level. Below 3 ％ of actual corrosion level, the corrosion residuals on the surface of corroded steel bar caused friction stress to increase between steel bar and concrete and those residuals contribute to increase bond strength. In post-corroded reinforcing bars, bond strength decreased dramatically due to the formation of corrosion crack around steel bar. The experimental results showed that the pre- and post-corroded specimens failed in ductile and brittle manner, respectively. The different behavior of these two flexural members is due to the recovery of bonding between concrete and steel bar during casting and hardening for pre-corroded specimens and the formation of expansion stress leading to concrete cracking for post-corroded specimens. |