Providing a Prediction Model for Stress Intensity Factor of Fiber- Reinforced Asphalt Mixtures under Pure Mode III Loading Using the Edge Notched Disc Beam (ENDB)

Document Type : Research Papers


1 Department of civil engineering, Yazd branch, Islamic Azad University, Yazd, Iran

2 Department of Civil Engineering, Yazd Branch, Islamic Azad University, Yazd, Iran

3 Islamic Azad University-Tehran North Branch, Tehran, Iran

4 Welding and Joining research center, School of Industrial Engineering, Iran University of Science and Technology (IUST), Tehran, Iran


The use of Edge Notched Disc Beam (ENDB) sample has been proposed as a suitable geometry in performing fracture tests in different loading modes. The most important features of the ENDB samples include easy making, quick and easy sampling, simple testing, and the ability to examine a wide range of pure and combined loading modes. Using a wide range of fracture tests, a statistical model is proposed to predict the stress intensity factors of asphalt mixtures in terms of the pure torsion mode (mode III) loading in this study. To this end, the experiments were carried out at different temperature conditions (-5, -15 and -25 °C), different loading conditions (0.5, 1 and 5 mm/min), and on control and modified asphalt mixtures with different percentages of polyolefin-aramid fibers. The results showed that, with increasing the fiber content and loading rate, the fracture strength increased with average 25%, while an increase in fracture toughness due to lower temperature had an effect of less than 5%.  Using the Response Surface Method (RSM), the prediction model of stress intensity coefficients of asphalt mixtures was presented in the pure torsion mode. The results of the proposed models had a good correlation with the results of the conducted fracture tests.


Articles in Press, Accepted Manuscript
Available Online from 28 December 2020
  • Receive Date: 30 August 2019
  • Revise Date: 04 September 2020
  • Accept Date: 08 September 2020