A comprehensive evaluation of the fatigue behavior of plant-produced RAP mixtures

Mohammadreza Sabouri, Thomas Bennert, Jo Sias Daniel, Y. Richard Kim

Research output: Contribution to journalConference articlepeer-review

3 Scopus citations

Abstract

In this study, the fatigue performance of twelve plant-produced mixtures from New Hampshire and Vermont that contain reclaimed asphalt pavement (RAP) contents of 0% to 40% by total weight of mixture was evaluated. The mixture tests included dynamic modulus, uniaxial fatigue, beam fatigue, and overlay tests. Also, the simplified viscoelastic continuum damage (S-VECD) model failure criterion, called the GR method, was applied and input to the linear viscoelastic pavement analysis for critical distresses (LVECD) program to predict the fatigue behavior of the tested mixtures in thin and thick asphalt pavement structures. In order to explain the observed fatigue behavior, the performance grades (PGs) of the binders that were extracted and recovered from the mixtures were determined. In general, the addition of RAP resulted in an increase in the stiffness of the materials. The magnitude of the impact of higher RAP percentages varied with each set of mixtures. The SVECD model and beam fatigue test data showed a loss of fatigue resistance for high percentage RAP mixtures in most of the cases. The overlay tester results showed clear drops in performance at higher RAP contents. The impact of lowering the PG of the virgin binder to compensate for higher levels of RAP also was studied. Lowering the PG led to improvement in the fatigue properties and was found to be a convenient practice. The changes in the measured properties also appeared to be a function of mix design variables that included the stiffness of the RAP, asphalt content, and production parameters such as silo storage times. In some cases, the effects of these factors outweighed the impact of the RAP level or PG of the virgin binder in the mixtures.

Original languageEnglish (US)
Pages (from-to)43-78
Number of pages36
JournalAsphalt Paving Technology: Association of Asphalt Paving Technologists-Proceedings of the Technical Sessions
Volume84
DOIs
StatePublished - 2015
EventAsphalt Paving Technology 2015, AAPT 2015 - Portland, United States
Duration: Mar 8 2015Mar 11 2015

ASJC Scopus subject areas

  • Civil and Structural Engineering

Keywords

  • Asphalt
  • Damage
  • Failure criterion
  • Fatigue
  • Reclaimed asphalt pavement

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