Next Article in Journal
Integrated BIM-Based LCA for Road Asphalt Pavements
Previous Article in Journal
The Use of Tunnel Demolition Rocks to Produce Shotcrete for a Railway Infrastructure
Font Type:
Arial Georgia Verdana
Font Size:
Aa Aa Aa
Line Spacing:
Column Width:

Investigating the Viability of Multi-Recycling of Asphalt Mixtures through a Preliminary Binder Level Characterization †

Gaetano Di Mino
Konstantinos Mantalovas
Vineesh Vijayan
Department of Engineering, University of Palermo, 90128 Palermo, Italy
Author to whom correspondence should be addressed.
Presented at the 1st International Online Conference on Infrastructures, 7–9 June 2022; Available online:
Eng. Proc. 2022, 17(1), 20;
Published: 2 May 2022
(This article belongs to the Proceedings of The 1st International Online Conference on Infrastructures)


The incorporation of reclaimed asphalt (RA) in hot mix asphalt mixtures is widely considered a sustainable solution for road infrastructure development. Under the scope of the circular economy (CE), the multiple recycling capability of RA has to be assessed in order to ensure its performance at each recycling cycle and also its viability with different additives. The performance of asphalt mixtures with RA strongly depends on the type of rejuvenator, binder, and their degree of blending in the mix. For this reason, it is essential to know the properties of the aged binder extracted from RA to better understand its rheological properties and optimal dosage of rejuvenation to design a satisfactory blend design for the recycled mixture. To analyse the multi-recycling potential of the recycled mixture with high RA content, it is imperative to study its characteristics at every recycling cycle. Therefore, in this study, a preliminary binder-scale study is carried out to better understand the ageing, rejuvenating effects and morphological changes that occur on the bituminous binders at every recycling cycle. The study has been conducted on a RA binder, extracted from RA from a rural road in Italy and the simulation of multiple recycling is conducted through a laboratory ageing protocol on both binder and asphalt mixture scales. The long-term binder level ageing is performed by a pressure ageing vessel (PAV) after the short-term ageing by the rolling thin film oven test (RTFO). The asphalt mixture ageing is performed through a protocol similar to the National Cooperative Highway Research Program (NCHRP) and the aged binder is extracted from the mixture for further investigations. Multiple recycling is simulated by repeating the ageing procedure after rejuvenating both the aged binder and aged mixture up to the amount of recycling needed for the study. The rheological properties of the aged binder obtained from both binder-scale and mixture-scale ageing methods are evaluated using a dynamic shear rheometer (DSR) and bending beam rheometer (BBR). Moreover, the morphological changes that occurred are analysed using SARA (saturates, aromatics, resin and asphaltenes) fractionation and atomic force microscopy (AFM). The results of the study can help towards answering the uncertainties regarding the performance of high RA% in asphalt mixtures and establishing its viability in multi recycling towards the full-scale implementation of this sustainable approach.

Author Contributions

Conceptualization, G.D.M., K.M. and V.V.; Methodology, G.D.M., V.V.; Validation, G.D.M., K.M. and V.V.; Formal Analysis, V.V.; Investigation, V.V.; Data curation, V.V.; Writing—Original Draft Preparation, G.D.M., K.M. and V.V.; Writing—Review and Editing, G.D.M., K.M. and V.V.; Visualization, V.V.; Supervision, G.D.M. and K.M.; Project Administration, G.D.M. All authors have read and agreed to the published version of the manuscript.


This research received no external funding.

Conflicts of Interest

The authors declare no conflict of interest.
Publisher’s Note: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affiliations.

Share and Cite

MDPI and ACS Style

Di Mino, G.; Mantalovas, K.; Vijayan, V. Investigating the Viability of Multi-Recycling of Asphalt Mixtures through a Preliminary Binder Level Characterization. Eng. Proc. 2022, 17, 20.

AMA Style

Di Mino G, Mantalovas K, Vijayan V. Investigating the Viability of Multi-Recycling of Asphalt Mixtures through a Preliminary Binder Level Characterization. Engineering Proceedings. 2022; 17(1):20.

Chicago/Turabian Style

Di Mino, Gaetano, Konstantinos Mantalovas, and Vineesh Vijayan. 2022. "Investigating the Viability of Multi-Recycling of Asphalt Mixtures through a Preliminary Binder Level Characterization" Engineering Proceedings 17, no. 1: 20.

Article Metrics

Back to TopTop