The complete compressive stress‐strain curve of recycled aggregate concrete (RC) after exposure to high temperatures improves to assess the post‐fire behavior of reinforced RC structures. In this paper, 60 specimens containing different levels of recycled coarse aggregate (RCA; i.e., 0, 30, 50, 70 and 100%) were produced to study the residual compressive stress‐strain relation of RC after exposure to high temperatures. Those specimens designed for thermal temperatures were initially heated to temperatures of 300, 400 and 500°C for 6 hr and then being submitted to test the compressive stress‐strain curves after cooling to ambient temperature. The test results were compared with specimens tested at room temperature (about 20°C). The effect of RCA and high temperatures on residual compressive strength, peak strain and elastic modulus are discussed and the empirical formulas for these parameters are also established. The recommended equation for the compressive constitutive relation for conventional concrete in the Chinese code for the design of concrete structures (GB50010‐2010) was adopted to fit the test data and was shown to be applicable to heated RC for different temperatures.
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.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.