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Characterization of Recovered Bitumen from Coarse and Fine Reclaimed Asphalt Pavement Particles

Department of Construction Engineering, École de Technologie Supérieure, Montreal, QC H3C 1K3, Canada
Department of Civil and Environmental Engineering, University of Waterloo, Waterloo, ON N2L 3G1, Canada
Author to whom correspondence should be addressed.
Infrastructures 2019, 4(2), 24;
Received: 9 April 2019 / Revised: 3 May 2019 / Accepted: 8 May 2019 / Published: 11 May 2019
(This article belongs to the Special Issue Recent Advance and Future Trends in Pavement Engineering)
PDF [4776 KB, uploaded 11 May 2019]


In the current era of road construction, it is common to add a small amount of reclaimed asphalt pavement (RAP) in asphalt mixes without significantly changing properties such as stiffness and low-temperature cracking resistance. Not only can these mixes be better for the environment, but they can also improve certain properties like rutting resistance. However, there is no clear understanding of how RAP gradation and bitumen properties impact the mixture properties. In this study, a single RAP source was separated into coarse and fine particles and added into a hot mix asphalt (HMA). Fourier transform infrared (FTIR) spectrometry was used to evaluate the chemical properties of the bitumen, while environmental scanning electron microscopy (ESEM) image analysis was used to visualize the differences of the virgin and RAP bitumen at a microscopic level. The observed results indicated that the recovered bitumen from coarse RAP did not have the same characteristics as the fine RAP bitumen, and the interaction of RAP bitumen with virgin bitumen significantly depended on RAP particle size. The amount of active RAP bitumen in coarse RAP particles was higher than in fine RAP particles. View Full-Text
Keywords: hot mix asphalt; recycled asphalt; RAP gradation; ignition test; FTIR; ESEM hot mix asphalt; recycled asphalt; RAP gradation; ignition test; FTIR; ESEM

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Saliani, S.S.; Carter, A.; Baaj, H.; Mikhailenko, P. Characterization of Recovered Bitumen from Coarse and Fine Reclaimed Asphalt Pavement Particles. Infrastructures 2019, 4, 24.

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