Ageing and rejuvenators: evaluating their impact on high RAP mixtures fatigue cracking characteristics using advanced mechanistic models and testing methods

Walaa S. Mogawer, Alexander Austerman, Reynaldo Roque, Shane Underwood, Louay Mohammad, Jian Zou

Research output: Contribution to journalArticle

Abstract

Fatigue cracking of asphalt mixtures is highly dependent on ageing. Using larger amounts of reclaimed asphalt pavement (RAP) presents a concern that the resultant mixtures may be prone to fatigue cracking because of the aged binder in the RAP. Several studies have indicated that asphalt rejuvenators can allow more aged binder to be incorporated into asphalt mixtures. The four-point flexural beam fatigue test, HMA (hot-mix asphalt) fracture mechanics model, simplified viscoelastic continuum damage model, and the semi-circular bending test were used to evaluate the effect of ageing on the fatigue characteristics of high RAP mixtures modified with rejuvenators. The results from these tests were compared to see if they provided similar performance trends. The results indicated that the long-term ageing used in this study did not have a significant effect on the fatigue characteristics of the high RAP mixture with and without rejuvenators. Comparison of the fatigue tests did not show universal agreement.

Original languageEnglish (US)
JournalRoad Materials and Pavement Design
DOIs
StateAccepted/In press - Sep 17 2015

Keywords

  • ageing
  • asphalt rejuvenator
  • fatigue cracking performance
  • reclaimed asphalt pavement

ASJC Scopus subject areas

  • Civil and Structural Engineering

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