Impact of Anchorage Length on Bond Performance Between Corroded Reinforcing Steel Bars and Concrete
CHEN Jun1, ZHANG Bai1, 2, YANG Ou3, LONG Shiguo1, XU Fu1, YANG Caiqian1
1 College of Civil Engineering and Mechanics, Xiangtan University, Xiangtan 411105 2 School of Civil Engineering, Southeast University, Nanjing 211189 3 College of Civil Engineering, Hunan University, Changsha 410082
Abstract: Aiming at digging out the impact of anchorage length (L) of steel bar on bond performance between corroded reinforcing steel bars and concrete, two kinds of cube specimens with different anchorage length (L=2d and L=5d, d is the diameter of rebar) were cast. Six groups of pull-out specimens with rebar mass loss percentage of 0.0%, 1.0%, 2.0%, 5.0%, 8.0%, 10.0% were prepared by means of current accele-rated method, and the maximum width of corrosion-induced cracking on these specimens was measured by fracture width gauge. According to the pull-out tests, the degradation laws of bonding performance between the corroded reinforcing steel bar and concrete were analyzed, conside-ring the influence of anchorage length and reinforcement corrosion rate. The experimental results showed that the expansive cracks in the specimen with longer anchorage length appeared earlier and the maximum crack width became larger because of the increased reinforcement corrosion level. The deterioration of concrete and the increase of corrosion rate would bring about an increase and then gradual decrease in bonding strength and initial bonding stiffness of specimens with diverse anchorage length. Additionally, the growing mass loss of rebars also leaded to the decline of bonding energy. The specimens with longer anchorage length (L=5d) held lower bond strength and bond stiffness than the specimens with shorter anchorage length (L=2d). Finally, an empirical model for predicting corrosion-induced cracking width based on reinforcement corrosion level was proposed, and the relationship between bond strength and corrosion level based on the tested results of previous studies was established, which can evaluate the residual bond strength with different corrosion levels.
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2019, Vol. 33 
