Abstract
To explore the bond behavior between steel rebar and recycled coarse aggregate (RCA) concrete after exposure to elevated temperatures, an experimental study was carried out. The results demonstrated that the bond strength of RCA concrete pullout specimens decreased greatly with increasing temperature. As the exposure temperature elevated, the slope of the ascending portion of the bond‐slip curves gradually declined, and the descending portion of the curves tended to flatten. A modified model was developed to predict the bond strength between RCA concrete and steel rebar after exposure to elevated temperature, and the predicted results showed a very good fit in the experimental test results. Besides, the proposed bond‐slip relations for steel rebar in RCA concrete after elevated temperatures showed satisfactory agreement with test results.
Highlights
In recent years, recycling and utilization of construction waste as aggregates in new concrete have been studied by many researchers [1,2,3,4,5,6,7,8]
Investigated the behavior of three beam-column joints under cyclic loading. It found that the behavior under cyclic loading of the concrete made with 30% replacement of natural by recycled aggregates was quite similar to ordinary concrete
Peng et al [12] tested 6 rectangular squat recycled concrete wall specimens to understand the behavior of squat reinforced concrete shear walls and promote the application of recycled concrete in structures and developed a simplified analytical method to predict the peak loads of squat walls failed in flexure or a mixed flexural-diagonal compression mode
Summary
In recent years, recycling and utilization of construction waste as aggregates in new concrete have been studied by many researchers [1,2,3,4,5,6,7,8] Their works were carried out to examine mechanical properties, durability of recycled aggregate concrete (RAC), and structural behavior of RAC members [9, 10]. The objectives of this study are establishing the constitutive equation of bond-slip relationship between RCA concrete and steel rebar after high temperatures, predicting bond strength between RCA concrete and steel rebar after high temperatures, and analyzing the influences of high temperatures, recycled coarse aggregate content, and heat exposure time on the bond behavior
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