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Investigations on fracture characteristics of geosynthetic reinforced asphalt concrete beams using single edge notch beam tests
Affiliation:1. North Carolina State University, Department of Civil, Construction and Environment Engineering, Raleigh - 27606, United States;2. Department of Civil Engineering, Indian Institute of Technology Madras, Chennai, India;1. Zachry Department of Civil Engineering, Texas A&M University, Dwight Look Engineering Building, Suite 601A, College Station, TX, 77843, United States;2. Department of Aerospace Engineering, Texas A&M University, College Station, TX, 77843, United States;3. Texas A&M Transportation Institute, 402 Harvey Mitchell Parkway South, Suite 173, College Station, TX, 77845, United States;4. Zachry Department of Civil Engineering, Texas A&M University, Dwight Look Engineering Building, Suite 501D, College Station, TX, 77843, United States;1. School of Civil Engineering and Transportation, South China University of Technology, Wushan Road No. 381, Guangzhou 510640, PR China;2. Rutgers, The State University of New Jersey, New Brunswick, NJ, USA;1. Welding and Joining Research Center, School of Industrial Engineering, Iran University of Science and Technology (IUST), Narmak, 16846-13114 Tehran, Iran;2. Asphalt Mixtures and Bitumen Research Center (ABRC), Iran University of Science and Technology (IUST), Narmak, 16846-13114 Tehran, Iran;3. School of Civil Engineering, Iran University of Science and Technology (IUST), Narmak, 16846-13114 Tehran, Iran;1. Institute of Highway Engineering, RWTH Aachen University, Aachen, Germany;2. Department of Civil Engineering, Tsinghua University, Beijing, China;3. School of Transportation Science and Engineering, Harbin Institute of Technology, Harbin, China;4. Institute of Urban and Pavement Engineering, TU Dresden, Dresden, Germany;1. PVAMU – The Texas A&M University System, Prairie View, TX 77446, USA;2. TTI – The Texas A&M University System, College Station, TX 77843, USA;3. Department of Civil Engineering, Texas A&M University, College Station, TX 77843, USA;4. Wuhan Institute of Technology, Wuhan, Hubei Province, China
Abstract:Reflective cracking is a major cause for premature deterioration of asphalt pavements. Different varieties of geosynthetics are used at the interfaces of surface layers to control the reflective cracks. The significant factors influencing their efficiency are the flexural strength and interfacial bonding. Fracture energy that leads to development of cracks and their propagation can be investigated by single-edge notched beam (SENB) tests with sufficient accuracy. Double layered asphalt samples were extracted from pavement sections purposely built as part of this investigation for conducting quasi-static SENB tests. The goal of this paper is two-fold (a) to present a methodology for conducting SENB tests to measure the fracture properties of geosynthetic reinforced samples at temperatures of 10 °C, 20 °C and 30 °C and (b) evaluation of the flexural and the fracture characteristics of unreinforced and geosynthetic reinforced samples. The geosynthetic reinforcement did not show much improvement of the Asphalt Concrete (AC) in the pre-cracking phase but slowed down the crack propagation. The failure pattern of reinforced specimens has changed from quasi-brittle to ductile. An equation is proposed to predict the crack initiation force of SENB sample knowing the bond strength of the corresponding reinforced AC layers at their respective temperature.
Keywords:Geosynthetics  Natural geotextiles  Single edge notched beam test  Fracture energy  Reflective cracking
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