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.
Highlights
Modern constructions require the conservation of natural resources and the preservation of environment due to the gradual depletion of natural resources and the disposal crisis of growing wastes, for example, demolition and construction wastes
As our study represents typical experimental parameters for the correction of reinforcing concrete with different level of recycled concrete aggregates (RCA), the authors believe any variations of the concrete mixture, pullout tests procedure, and others will challenge the reproduction of the experiment and will not cause substantially different or reverse conclusions
(1) High-strength recycled aggregate concrete (RAC) tends to crack in a smaller scale due to its relatively higher tensile strength
Summary
Modern constructions require the conservation of natural resources and the preservation of environment due to the gradual depletion of natural resources and the disposal crisis of growing wastes, for example, demolition and construction wastes. Bond behavior between RAC and the rebars has raised wide attention in the structural engineering world [7,8,9,10,11,12,13]. These previous studies focus mainly on the bond strength of RAC embedded with the deformed and plain rebars in uncorroded states; few studies were conducted on the behavior of reinforced RAC considering steel corrosion [14, 15]. It is necessary to examine the bond behavior of RAC under different corrosion levels
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