Comparison of laboratory performance of asphalt mixes containing different proportions of RAS and RAP

Rouzbeh Ghabchi, Manik Barman, Dharamveer Singh, Musharraf Zaman, Muhammad Ali Mubaraki

Research output: Contribution to journalArticlepeer-review

25 Scopus citations

Abstract

Despite environmental and economic advantages associated with incorporating recycled asphalt shingles (RAS) and reclaimed asphalt pavement (RAP) in hot-mix asphalt (HMA), concerns focus on fatigue and low-temperature cracking potential of pavements containing RAS and RAP. This study was undertaken to identify the areas in need for research through conducting a national survey among departments of transportation and to evaluate the effects of RAS and RAP on fatigue, low-temperature cracking and stiffness of HMA. National survey results indicated that while the fatigue cracking is the major concern when RAS and/or RAP are used in mixes, no specific test is recommended for fatigue evaluation of these mixes at the mix design stage. It was found that, fatigue life of mixes with a non-polymer-modified binder containing a blend of 5% RAS and 5% RAP led to the maximum increase in fatigue life. However, incorporation of 6% RAS decreased the fatigue life of mixes, when compared with virgin mix. Also, it was found that addition of RAS and/or RAP to asphalt mixes increased their dynamic moduli which may result in a better rutting performance. From creep compliance test results it was concluded that use of RAS and/or RAP may lead to a higher low-temperature cracking potential when compared with the virgin mixes. Findings of this study can be used to develop/update guidelines/special provisions for design of HMA containing RAS and RAP.

Original languageEnglish (US)
Pages (from-to)343-351
Number of pages9
JournalConstruction and Building Materials
Volume124
DOIs
StatePublished - Oct 15 2016

Keywords

  • Creep
  • Dynamic modulus
  • Fatigue
  • Hot-mix asphalt (HMA)
  • Low-temperature crack
  • Reclaimed asphalt pavement (RAP)
  • Recycled asphalt shingles (RAS)

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