Mechanical behavior of recycled coarse aggregate concrete reinforced with steel fibers under direct shear |
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| Affiliation: | 1. Research Center of New Style Building & Structure, Zhengzhou University, No.100, Kexue Road, Zhengzhou, 450001, Henan, China;2. Henan University of Engineering, No.1, Xianghe Road, Zhengzhou, 451191, Henan, China;3. Faculty of Engineering and Computer Science, Concordia University, 1455 de Maisonneuve West, Montreal, Quebec, H3G1M8, Canada;1. Geomaterials Laboratory, University Hassiba Benbouali Chlef, 02000, Algeria;2. University of Tissemsilt, 38000 Tissemsilt, Algeria;1. Department of Civil and Environmental Engineering, Sejong University, 98 Gunja-Dong, Gwangjin-Gu, Seoul 05006, South Korea;2. Korea Railroad Research Institute, 176 Railroad Museum Road, Uiwang-si, Gyeonggi-do 16105, South Korea;1. Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1049-001 Lisbon, Portugal;2. ICIST, CERIS, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1049-001 Lisbon, Portugal;1. Civil Engineering Department, The Hashemite University, Zarqa, Jordan;2. Civil Engineering Department, The University of Jordan, Amman, Jordan;1. School of Civil and Transportation Engineering, Guangdong University of Technology, Guangzhou 510006, China;2. Department of Materials, Imperial College London, London SW7 2AZ, United Kingdom |
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| Abstract: | Recycled coarse aggregate (RCA) concrete has attracted more and more attention worldwide in recent years due to the exhaustion of natural coarse aggregate and environmental pollution from construction and demolition waste in civil engineering. In this study, experiments were carried out on over 100 specimens to investigate the mechanical properties and failure mode of concrete with different volume content of steel fibers (0%, 0.5%, 1%, 1.5%, and 2%) and different RCA replacement ratio (0%, 30%, 50% and 100%) under direct shear load. The results show that addition of steel fibers can effectively improve the shear strength and shear toughness of RCA concrete. For a given compressive strength, the RCA replacement ratio has negligible impact on shear strength, but shear deformation and toughness increase as RCA replacement ratio reaches above a ‘limiting value’. A shear strength formula for steel fiber reinforced RCA concrete (SFRCAC) based on compressive strength and characteristic coefficient of steel fiber has been put forward. |
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| Keywords: | Recycled coarse aggregates Steel fibers Direct shear Shear strength Shear toughness |
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