Performance of fiber reinforced asphalt concrete under environmental temperature and water effects |
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| Affiliation: | 1. Civil, Architectural and Environmental Engineering, The University of Texas at Austin, TX 78712, USA;2. School of Materials Science and Engineering, Chang’an University, Xi’an 710064, China;1. Department of Civil Engineering, Yazd Branch, Islamic Azad University, Yazd, Iran;2. Islamic Azad University-North Tehran Branch, Vafadar Blvd., Shahid Sadoughi St., Hakimiyeh Exit, Shahid Babaee Highway, Tehran, Iran;3. Welding and Joining Research Center, School of Industrial Engineering, Iran University of Science and Technology (IUST), Narmak, 16846-13114, Tehran, Iran;1. Department of Civil, Environmental, Aerospace, Materials Engineering (DICAM), University of Palermo, Italy;2. DIIES Department, University Mediterranea of Reggio Calabria, Italy;1. Dept of Construction Engineering, École de Technologie Superieure, 1100 Rue Notre-Dame O, Montréal, QC H3C 1K3, Canada;2. Département de génie civil, Université Laval, 1065 av. de la Médecine, QC G1V 0A6, Canada;1. Department of Civil Engineering, Iran University of Science and Technology, Narmak, Tehran, Iran;2. Drim Consulting Company, Tehran, Iran;3. General Directorate of Roads and Urban Development of Alborz Province, Azimiye, Karaj, Alborz, Iran;4. Department of Civil Engineering, Iran University of Science and Technology (IUST), Narmak, 16846-13114 Tehran, Iran;1. Division of Structures and Mechanics, Nanyang Technological University, N1-01c-79, 50 Nanyang Avenue, Singapore 639798, Singapore;2. School of Transportation, Southeast University, Sipailou 2, Nanjing 210096, PR China;3. Transportation Quality Administration, Chuanjin Rd. 3, Kunming, PR China;1. Department of Civil Engineering, Imam Khomeini International University, Qazvin, Iran;2. Department of Civil Engineering, South Tehran Branch, Islamic Azad University, Tehran, Iran;3. Civil Engineering Department, Anar Branch, Islamic Azad University, Anar, Iran;4. Islamic Azad University, Science and Research Branch, Tehran, Iran;5. Department of Civil Engineering, Razi University, Kermanshah, Iran |
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| Abstract: | This paper studies the reinforcing effects and mechanisms of fibers for asphalt concrete (AC) mixtures under the environment temperature and water effects. Four typical fiber types – polyester, polyacrylonitrile, lignin and asbestos – are studied. Laboratory tests were conduct on the fiber reinforced AC (FRAC) to measure its strength, strain and fatigue behavior. Results show that fibers have significantly improved AC’s rutting resistance, fatigue life, and toughness. The flexural strength and ultimate flexural strain, and the split indirect tensile strength (SITS) at low temperature have also improved. The polymer fibers (polyester and polyacrylonitrile) have improved rutting resistance, fatigue life, and SITS more significantly than lignin and asbestos fibers, which may be primarily due to their greater networking function; while lignin and asbestos fibers result in greater flexural strength and ultimate flexural strain, which may be primarily due to their greater asphalt stabilization effect. However, fiber’s effect under the water freezing–thaw effect does not seem promising, and the SITS of FRAC with lignin and asbestos fibers even reduces to some extent under this effect. It is also found that a fiber content of 0.35% by mass of mixture achieves the optimum performance outputs of rutting resistance and SITS for polyester fiber. |
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