Structural Engineering and Mechanics

  • 제86권5호
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  • Pages.607-619
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  • 2023
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  • 1225-4568(pISSN)
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  • 1598-6217(eISSN)
테크노프레스 (Techno-Press)
권호 표지
DOI QR코드

DOI QR Code

Effects of particle size and loading rate on the tensile failure of asphalt specimens based on a direct tensile test and particle flow code simulation

  • Q. Wang (School of Highway, Henan College of Transportation) ;
  • D.C. Wang (School of Civil Engineering and Transportation, North China University of Water Resources and Electric Power) ;
  • J.W. Fu (School of Civil Engineering and Transportation, North China University of Water Resources and Electric Power) ;
  • Vahab Sarfarazi (Department of Mining Engineering, Hamedan University of Technology) ;
  • Hadi Haeri (Department of Mining Engineering, Higher Education Complex of Zarand, Shahid Bahonar University of Kerman) ;
  • C.L. Guo (China Railway 14th Bureau Group Tunnel Engineering Co. LTD.) ;
  • L.J. Sun (China Railway 14th Bureau Group Tunnel Engineering Co. LTD.) ;
  • Mohammad Fatehi Marji (Department of Mine Exploitation Engineering, Faculty of Mining and Metallurgy, Institute of Engineering, Yazd University)
  • 투고 : 2022.02.27
  • 심사 : 2023.04.24
  • 발행 : 2023.06.10
⟨ 이전 논문 다음 논문 ⟩

초록

This study, it was tried to evaluate the asphalt behavior under tensile loading conditions through indirect Brazilian and direct tensile tests, experimentally and numerically. This paper is important from two points of view. The first one, a new test method was developed for the determination of the direct tensile strength of asphalt and its difference was obtained from the indirect test method. The second one, the effects of particle size and loading rate have been cleared on the tensile fracture mechanism. The experimental direct tensile strength of the asphalt specimens was measured in the laboratory using the compression-to-tensile load converting (CTLC) device. Some special types of asphalt specimens were prepared in the form of slabs with a central hole. The CTLC device is then equipped with this specimen and placed in the universal testing machine. Then, the direct tensile strength of asphalt specimens with different sizes of ingredients can be measured at different loading rates in the laboratory. The particle flow code (PFC) was used to numerically simulate the direct tensile strength test of asphalt samples. This numerical modeling technique is based on the versatile discrete element method (DEM). Three different particle diameters were chosen and were tested under three different loading rates. The results show that when the loading rate was 0.016 mm/sec, two tensile cracks were initiated from the left and right of the hole and propagated perpendicular to the loading axis till coalescence to the model boundary. When the loading rate was 0.032 mm/sec, two tensile cracks were initiated from the left and right of the hole and propagated perpendicular to the loading axis. The branching occurs in these cracks. This shows that the crack propagation is under quasi-static conditions. When the loading rate was 0.064 mm/sec, mixed tensile and shear cracks were initiated below the loading walls and branching occurred in these cracks. This shows that the crack propagation is under dynamic conditions. The loading rate increases and the tensile strength increases. Because all defects mobilized under a low loading rate and this led to decreasing the tensile strength. The experimental results for the direct tensile strengths of asphalt specimens of different ingredients were in good accordance with their corresponding results approximated by DEM software.

키워드

과제정보

This work was financially supported by National Natural Science Foundation of China (Grant No. 51608117) and High foreign country expert project in Henan province (Grant No. HNGD2022040).

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