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Binder and Mixture Fatigue Performance of Plant-Produced Road Surface Course Asphalt Mixtures with High Contents of Reclaimed Asphalt

1
Pavement Design and Asset Management, Civil and Infrastructure, AECOM, Nottingham, NG9 6RZ, UK
2
Nottingham Transportation Engineering Centre, University of Nottingham, Nottingham, NG7 2RD, UK
3
Dipartimento di Ingegneria, Scuola Politecnica, Edificio 8, Universitá degli Studi di Palermo, 90128 Palermo, Italy
*
Author to whom correspondence should be addressed.
Sustainability 2019, 11(13), 3752; https://doi.org/10.3390/su11133752
Received: 28 May 2019 / Revised: 3 July 2019 / Accepted: 3 July 2019 / Published: 9 July 2019
(This article belongs to the Special Issue Sustainable Infrastructure Materials and Systems)
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Abstract

The aged properties of Reclaimed Asphalt (RA) binders are one of the main factors working against their utilisation in high-RA content (>30%) mixes for surface courses. Fatigue cracking is the main distress of surface courses that are manufactured with a high percentage of RA. This investigation presents results of the rheological and fatigue results of different asphalt mixtures and their recovered binders. The binders were recovered from asphalt mixtures that had been manufactured in asphalt plants using different amounts of RA with contents up to 60% with and without rejuvenators. Two different sources of RA were used, representing a moderately aged RA and an extremely aged RA. The Dynamic Shear Rheometer (DSR) was used to assess the fatigue-characteristics of the binders using time sweep tests while the fatigue characteristics of their mixtures were assessed using the Indirect Tensile Fatigue Test (ITFT). The fatigue data was analysed based on the cumulative dissipated energy approach in addition to traditional fatigue analysis. Results have shown that the ageing condition of RA significantly affects the fatigue properties of recovered binders. Binder and asphalt mixture fatigue results showed that RA contents up to 60% can produce comparable fatigue performance compared to lower percentages of RA in road surface course if the aged RA binder is sufficiently rejuvenated. View Full-Text
Keywords: road surface courses; reclaimed asphalt (RA); asphalt binder; fatigue performance; rejuvenators road surface courses; reclaimed asphalt (RA); asphalt binder; fatigue performance; rejuvenators
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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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Subhy, A.; Menegusso Pires, G.; Jiménez del Barco Carrión, A.; Lo Presti, D.; Airey, G. Binder and Mixture Fatigue Performance of Plant-Produced Road Surface Course Asphalt Mixtures with High Contents of Reclaimed Asphalt. Sustainability 2019, 11, 3752.

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