A Study on the Bond Behavior of Corroded Reinforced Concrete Containing Recycled Aggregates

Abstract

This paper investigated bond-slip characteristics of chloride-induced corroded reinforced concrete incorporating different levels of recycled concrete aggregates (RCA). Pullout tests were adopted to evaluate the bonding and debonding behaviors of the embedded rebar experiencing different corrosion levels. Both high- and low-strength concrete were considered. Bond-slip curves were recorded to determine the influences of rebar corrosion levels and RCA replacements on the bond strength and debonding energy of the specimens. Test results indicate that increasing rebar corrosion level gradually weakens the antisliding ability of reinforced recycled aggregate concrete (RAC) except for a small level corrosion and the degradation rate of ultimate bond strength increases with a decrease of compressive strength at 0.5% rebar corrosion. The results also demonstrate that the ultimate bond strength of reinforced RAC slightly decreases with an increase of RCA replacement. However, the relative bond strength between uncorroded rebar and RAC is little affected by RCA content, while it decreases with an increase of RCA replacement in high-strength specimens after rebar corrosion. The debonding energy between deformed rebar and RAC is found decreasing with the increment of the rebar corrosion level and increasing with an increase of RAC content.

Investigation on the Structural Behavior of Shear Walls with Steel Truss Coupling Beams under Seismic Loading

“…Experimental researches have been employed to investigate seismic behaviors and energy dissipation mechanism of steel truss CBs under low-cyclic reversed loading [43][44][45]. ey also proposed a novel joint design style for steel-reinforced concrete T-shaped columns, conducted experiments on joint samples under low-cyclic reversed loading [46], and further studied on hysteresis behaviors and the bond-slip curves [47]. Finite element analyses and pseudostatic tests were adopted for studies on steel truss CBs [48][49][50]; it is proved that the steel truss CB has excellent ductility and energy dissipation properties.…”

Flexural Behavior of Corroded Reinforced Recycled Aggregate Concrete Beams

“…Tests have also shown that increasing the rebar corrosion level gradually weakens the antisliding ability of reinforced RAC, and the ultimate bond strength of reinforced RAC slightly decreases with an increase of RCA replacement. However, the relative bond strength between uncorroded rebar and RAC is minimally a ected by the RCA content [24]. In addition, the antipermeability property of RAC decreases with increase in the recycled aggregate replacement percentage [25,26].…”