Bond strength prediction for deformed steel rebar embedded in recycled coarse aggregate concrete |
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| Affiliation: | 1. Department of Construction Engineering Education, Chungnam National University, Daejeon 305-764, Republic of Korea;2. Department of Architectural Engineering, Chungnam National University, Daejeon 305-764, Republic of Korea;1. State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing 100083, China;2. Department of Materials Science and Engineering, The Pennsylvania State University, University Park, PA 16802, USA;1. College of Civil and Transportation Engineering, Hohai Univ., No. 1, Xikang Rd., Nanjing 210098, China;2. Jiangsu Engineering Research Center of Crack Control in Concrete, No. 1, Xikang Rd., Nanjing 210098, China;3. Nanjing Construction Group Co., Ltd, No. 200, Ruanjian Avenue, Nanjing 210012, China;1. Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1049-001 Lisbon, Portugal;2. ICIST, DECivil, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1049-001 Lisbon, Portugal;1. School of Civil Engineering, Qingdao University of Technology, Qingdao 266033, China;2. Collaborative Innovation Center of Engineering Construction and Safety in Shandong Blue Economic Zone, Qingdao University of Technology, Qingdao 266033, China;3. School of Highway, Chang’an University, Xi’an, Shaanxi 710064, China |
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| Abstract: | This paper summarizes the results of an experimental investigation into the bond behavior between recycled aggregate concrete (RAC) and deformed steel rebars, with the main variables being the recycled coarse aggregate replacement ratio (RCAr) and water-to-cement ratio of the concrete mixture. The investigation into splitting cracking strength indicates that the degradation of the bond splitting tensile stress of the cover concrete was affected by not only the roundness of the coarse aggregate particles but also the weak interfacial transition zone (ITZ) between the cement paste and the RCA that has a more porous structure in the ITZ than normal concrete. In this study, a linear relationship between the bond strength and the density of the RCA was found, but the high compressive strength reduced the effects of the parameters. To predict the bond strength of RAC using the main parameters, a multivariable model was developed using nonlinear regression analysis. It can be inferred from this study that the degradation characteristic of the bond strength of RAC can be predicted well, whereas other empirical equations and code provisions are very conservative. |
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| Keywords: | Recycled coarse aggregate (RCA) concrete Pull-out test Bond strength Density Compressive strength Nonlinear regression analysis |
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