Pre- and post-peak toughening behaviours of fibre-reinforced hot-mix asphalt mixtures

P. J. Yoo, I. L. Al-Qadi

Research output: Contribution to journalArticlepeer-review


Recycled plastic fibre-reinforced hot-mix asphalt (HMA) mixtures have better fatigue resistance than plain HMA. The toughening effects of recycled plastic fibre-reinforced HMA were characterised using direct tensile loading tests. Adding a small quantity of recycled plastic fibres to HMA was found to significantly increase the mixture's fracture energy and toughness, which were calculated using the pre- and post-peak stages of tensile force-displacement curves. A theoretical model representing the pre-peak behaviour of fibre-reinforced HMA with direct tension-softening curves for various fibre contents is presented here. The enhanced toughness through post-peak analysis was also observed using toughness indices associated with fibre-bridging effect after the pre-peak composite stress. The pre-peak fracture energy model and post-peak toughness indices appeared to be governed by the direct tensile toughening of fibre-reinforced HMA's enhanced fibre-bridging effects. The pre-peak fracture energy model demonstrates the effect of fibre content on the strain energy density during the pull-out process within the pre-peak composite stress region. The maximum pre-peak fracture energy of a coarse-graded HMA mixed with recycled plastic fibres is achieved at a fibre content of 0.4% of the total weight of the HMA. The increases in the toughness indices within the post-peak composite stress region indicate that the fatigue resistance of fibre-reinforced HMA is at least 30% greater than that of control HMA.

Original languageEnglish (US)
Pages (from-to)122-132
Number of pages11
JournalInternational Journal of Pavement Engineering
Issue number2
StatePublished - Feb 7 2014


  • Fatigue
  • Fibre
  • Fracture energy
  • Hot-mix asphalt
  • Toughness

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Mechanics of Materials


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