Comparison of Fracture Test Methods for Evaluating the Crack Resistance of Asphalt Mixture
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RESEARCH ARTICLE-CIVIL ENGINEERING
Comparison of Fracture Test Methods for Evaluating the Crack Resistance of Asphalt Mixture Bochao Zhou1 · Jianzhong Pei1 · Jiupeng Zhang1 · Fucheng Guo1 · Yong Wen1 · Peifeng Luo2 Received: 5 September 2019 / Accepted: 29 July 2020 © King Fahd University of Petroleum & Minerals 2020
Abstract For the better understanding of fracture test method to evaluate the crack resistance of asphalt mixtures, the current test methods and evaluation indexes were theoretically and experimentally compared, including the indirect tensile test, single edge notch beam test, semicircular bending test (SCB) and disk-shaped compact tension test. The stress intensity factors for different tests were compared, and the appropriate range of notch depth was determined. The SCB was finally selected as the test method for evaluating the crack resistance of the asphalt mixtures. According to the relationship between the fracture energy and notch depths, the essential fracture energy of asphalt mixtures was calculated, and it was recommended as the evaluation index of asphalt mixtures for crack resistance. Furthermore, the failure process of the SCB was analyzed, and the contraflexure point on the load–displacement curve was found and defined. The fracture energy at the contraflexure point could be used to evaluate the ultimate crack resistance of the asphalt mixtures. The application of the essential fracture energy and the contraflexure point can correspond to the actuality of the asphalt pavement, which provides a reference for the crack resistance research of asphalt mixtures in the future. Keywords Notch depth · Stress intensity factor · Semicircular bending test (SCB) · Essential fracture energy · Contraflexure point List of Symbols IDT test Indirect tensile test SENB test Single edge notch beam test SCB test Semicircular bending test DCT test Disk-shaped compact tension test * Jiupeng Zhang [email protected] Bochao Zhou [email protected] Jianzhong Pei [email protected] Fucheng Guo [email protected] Yong Wen [email protected] Peifeng Luo [email protected] 1
Key Laboratory for Special Area Highway Engineering of Ministry of Education, Chang’an University, Xi’an 710064, Shaanxi, China
Zhejiang Zhonglu Traffic Design Co., Ltd., Jiaxing 314000, Zhejiang, China
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ENDB test Edge notched disk bend test ENDC test Edge notched diametrically compressed test SHRP Strategic highway research program LEFM Linear elastic fracture mechanics EPFM Elastic plastic fracture mechanics CZM Cohesive zone model CMOD Crack mouth opening displacement JC Critical energy rate RT Split tensile strength PT Maximum value of the test load σt Tensile stress at the bottom of specimen F Vertical load K Stress intensity factor KC Critical stress intensity factor U The work of load t Cohesion δ The relative displacement of the fracture surface T Mechanical strength, the maximum value of cohesion δf Failure displacement, the maximum displacement of the fracture surface
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