Title: Characterisation of Superpave recycled asphalt mixtures utilising optimum contents of fatty amine-based asphalt additive

Authors: Firas Barraj; Ali Hatoum; Joseph J. Assaad; Ghida Alhakim; Jamal Khatib; Yasser Assaf; Adel Elkordi

Addresses: Faculty of Engineering, University of Balamand, P.O. Box 100, Al Koura 1304, Lebanon ' Faculty of Engineering, Islamic University of Lebanon, Wardenieh, Lebanon ' Faculty of Engineering, University of Balamand, P.O. Box 100, Al Koura 1304, Lebanon ' Faculty of Engineering, Beirut Arab University, P.O. Box 11-5020, Riad El Solh, Beirut 1107-2809, Lebanon ' Faculty of Engineering, Beirut Arab University, P.O. Box 11-5020, Riad El Solh, Beirut 1107-2809, Lebanon; Faculty of Science and Engineering, University of Wolverhampton, Wolverhampton WV1 1LY, UK ' Department of Civil, Environmental, Land, Building and Chemical Engineering, Polytechnic University of Bari, Bari, Italy ' Faculty of Engineering, Beirut Arab University, P.O. Box 11-5020, Riad El Solh, Beirut 1107-2809, Lebanon; Department of Civil and Environmental Engineering, Faculty of Engineering, Alexandria University, Alexandria 21511, Egypt

Abstract: This paper investigates the properties of warm asphalt mixtures containing varying levels of reclaimed asphalt pavement (RAP) and a novel fatty amine-based asphalt additive. Addressing limitations of warm mix asphalt (WMA) and RAP, the study employs Superpave design and optimal additive content. Dynamic modulus (DM) and flow number (FN) tests assess additive impact on RAP mix behaviour. Results reveal increased creep compliance, lower dynamic and relaxation moduli, and higher rutting susceptibility in warm mixes with RAP. However, they exhibit enhanced resistance to cracking compared to standard and recycled mixes. Notably, phase angle values remain consistent across mixes, except for a significant increase in warm mixes with low and medium RAP content at specific reduced frequencies of 10^-1 and 10^-2 Hz. This research highlights the potential of combining WMA, RAP, and a novel additive to optimise asphalt mixture performance.

Keywords: linear viscoelastic range; asphalt properties; sustainability; mastercurves method; time-temperature superposition.

DOI: 10.1504/IJMRI.2025.142976

International Journal of Masonry Research and Innovation, 2025 Vol.10 No.1, pp.76 - 99

Received: 15 Aug 2023
Accepted: 28 Oct 2023
Published online: 02 Dec 2024 *

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