Self-healing asphalt with optimised tyre-based pyro-rejuvenator

Chávez-Delgado, Manuel; Concha, Jose L.; Caro, Silvia; Silva, Carlos P.; Arteaga-Pérez, Luis E.; Norambuena-Contreras, Jose

doi:10.1016/j.fuel.2025.135747

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Self-healing asphalt with optimised tyre-based pyro-rejuvenator

Manuel Chávez-Delgado, Jose L. Concha

, Silvia Caro, Carlos P. Silva

, Luis E. Arteaga-Pérez

, Jose Norambuena-Contreras

Fuel, Volume: 400, Start page: 135747

Swansea University Author: Jose Norambuena-Contreras

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DOI (Published version): 10.1016/j.fuel.2025.135747

Abstract

This study investigates an optimised pyro-rejuvenator (PR), derived from the pyrolysis of waste tyres, as a novel agent for self-healing asphalt. A multi-scale approach, encompassing chemical, microstructural, and mechanical evaluations, was employed to assess the effectiveness of the pyro-rejuvenat...

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Published in:	Fuel
ISSN:	0016-2361
Published:	Elsevier BV 2025
Online Access:	Check full text
URI:	https://cronfa.swan.ac.uk/Record/cronfa69617

first_indexed	2025-06-03T09:05:50Z
last_indexed	2025-07-17T04:47:56Z
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spelling	2025-07-16T11:41:13.8177247 v2 69617 2025-06-03 Self-healing asphalt with optimised tyre-based pyro-rejuvenator 73c6854ebb10465fbf7faab297135641 0000-0001-8327-2236 Jose Norambuena-Contreras Jose Norambuena-Contreras true false 2025-06-03 ACEM This study investigates an optimised pyro-rejuvenator (PR), derived from the pyrolysis of waste tyres, as a novel agent for self-healing asphalt. A multi-scale approach, encompassing chemical, microstructural, and mechanical evaluations, was employed to assess the effectiveness of the pyro-rejuvenator. The PR was incorporated into long-term aged bitumen (PAV) at dosages of 3 wt. % and 6 wt. %, with chemical changes analysed using Fourier transform infrared spectroscopy (FTIR), atomic force microscopy (AFM), and chemical fractionation (SARA). The self-healing performance of the treated and unaged bitumen was evaluated through fatigue-healing-fatigue tests using a dynamic shear rheometer (DSR) and tensile tests under static conditions. Additionally, the PR’s efficacy was compared with a commercial rejuvenator. Results showed that PR’s high content of alkenes and aromatics (e.g., limonene: 32.9 %, cymene: 20.65 %) facilitated the restoration of the maltenic fraction in bitumen and enhanced chemical interactions with the treated material. These compounds also promoted the pepticising effect on the “bee-like” structures, leading to a more homogeneous microstructure. Under optimal conditions (6 wt. % PR dosage and 30 °C), a fatigue healing index of 30 % was achieved, comparable to virgin bitumen (31 %). In tensile tests at 25 °C after 12 h, the healing index matched that of the commercial rejuvenator. These findings highlight the potential of pyro-rejuvenators as a sustainable and effective solution for the functional restoration of aged bitumen. Journal Article Fuel 400 135747 Elsevier BV 0016-2361 Self-Healing; Asphalt rejuvenator; Tyre pyrolytic oil; Cracking; Atomic force microscopy 15 11 2025 2025-11-15 10.1016/j.fuel.2025.135747 COLLEGE NANME Aerospace, Civil, Electrical, and Mechanical Engineering COLLEGE CODE ACEM Swansea University National Research and Development Agency (ANID); Research Project FONDEF IDeA 21I10127; FONDEQUIP EQM160036; Universidad del Bío-Bío for the internal PhD scholarship awarded; Universidad del Bío-Bío through the FAPEI FP2441850. 2025-07-16T11:41:13.8177247 2025-06-03T10:01:10.0301442 Faculty of Science and Engineering School of Aerospace, Civil, Electrical, General and Mechanical Engineering - Civil Engineering Manuel Chávez-Delgado 1 Jose L. Concha 0000-0003-3746-651x 2 Silvia Caro 3 Carlos P. Silva 0000-0001-5344-042x 4 Luis E. Arteaga-Pérez 0000-0003-3982-4165 5 Jose Norambuena-Contreras 0000-0001-8327-2236 6 69617__34386__33585545d00045898f761d42d2955ae4.pdf 69617.pdf 2025-06-03T10:05:38.2902115 Output 1919183 application/pdf Accepted Manuscript true Author accepted manuscript document released under the terms of a Creative Commons CC-BY licence using the Swansea University Research Publications Policy (rights retention). true eng https://creativecommons.org/licenses/by/4.0/deed.en
title	Self-healing asphalt with optimised tyre-based pyro-rejuvenator
spellingShingle	Self-healing asphalt with optimised tyre-based pyro-rejuvenator Jose Norambuena-Contreras
title_short	Self-healing asphalt with optimised tyre-based pyro-rejuvenator
title_full	Self-healing asphalt with optimised tyre-based pyro-rejuvenator
title_fullStr	Self-healing asphalt with optimised tyre-based pyro-rejuvenator
title_full_unstemmed	Self-healing asphalt with optimised tyre-based pyro-rejuvenator
title_sort	Self-healing asphalt with optimised tyre-based pyro-rejuvenator
author_id_str_mv	73c6854ebb10465fbf7faab297135641
author_id_fullname_str_mv	73c6854ebb10465fbf7faab297135641_***_Jose Norambuena-Contreras
author	Jose Norambuena-Contreras
author2	Manuel Chávez-Delgado Jose L. Concha Silvia Caro Carlos P. Silva Luis E. Arteaga-Pérez Jose Norambuena-Contreras
format	Journal article
container_title	Fuel
container_volume	400
container_start_page	135747
publishDate	2025
institution	Swansea University
issn	0016-2361
doi_str_mv	10.1016/j.fuel.2025.135747
publisher	Elsevier BV
college_str	Faculty of Science and Engineering
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hierarchy_top_id	facultyofscienceandengineering
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department_str	School of Aerospace, Civil, Electrical, General and Mechanical Engineering - Civil Engineering{{{_:::_}}}Faculty of Science and Engineering{{{_:::_}}}School of Aerospace, Civil, Electrical, General and Mechanical Engineering - Civil Engineering
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description	This study investigates an optimised pyro-rejuvenator (PR), derived from the pyrolysis of waste tyres, as a novel agent for self-healing asphalt. A multi-scale approach, encompassing chemical, microstructural, and mechanical evaluations, was employed to assess the effectiveness of the pyro-rejuvenator. The PR was incorporated into long-term aged bitumen (PAV) at dosages of 3 wt. % and 6 wt. %, with chemical changes analysed using Fourier transform infrared spectroscopy (FTIR), atomic force microscopy (AFM), and chemical fractionation (SARA). The self-healing performance of the treated and unaged bitumen was evaluated through fatigue-healing-fatigue tests using a dynamic shear rheometer (DSR) and tensile tests under static conditions. Additionally, the PR’s efficacy was compared with a commercial rejuvenator. Results showed that PR’s high content of alkenes and aromatics (e.g., limonene: 32.9 %, cymene: 20.65 %) facilitated the restoration of the maltenic fraction in bitumen and enhanced chemical interactions with the treated material. These compounds also promoted the pepticising effect on the “bee-like” structures, leading to a more homogeneous microstructure. Under optimal conditions (6 wt. % PR dosage and 30 °C), a fatigue healing index of 30 % was achieved, comparable to virgin bitumen (31 %). In tensile tests at 25 °C after 12 h, the healing index matched that of the commercial rejuvenator. These findings highlight the potential of pyro-rejuvenators as a sustainable and effective solution for the functional restoration of aged bitumen.
published_date	2025-11-15T14:16:21Z
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score	11.089677

Self-healing asphalt with optimised tyre-based pyro-rejuvenator

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