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Enhancing rheological and self-healing properties of aged bitumen using a pyro-rejuvenator from waste tyres

Manuel Chávez-Delgado Orcid Logo, Jose L. Concha, Silvia Caro Orcid Logo, Luis E. Arteaga-Pérez Orcid Logo, Jose Norambuena-Contreras Orcid Logo

Construction and Building Materials, Volume: 470, Start page: 140639

Swansea University Author: Jose Norambuena-Contreras Orcid Logo

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DOI (Published version): 10.1016/j.conbuildmat.2025.140639

Abstract

The progressive ageing of bitumen in road construction, driven by environmental and traffic conditions, presents a significant challenge in pavement engineering. This ageing process reduces the lifespan of the asphalt roads and their intrinsic self-healing capabilities to seal cracks. To address thi...

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Published in: Construction and Building Materials
ISSN: 0950-0618
Published: Elsevier BV 2025
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URI: https://cronfa.swan.ac.uk/Record/cronfa69134
first_indexed 2025-03-21T11:04:38Z
last_indexed 2025-03-22T06:04:17Z
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spelling 2025-03-21T11:04:36.5053644 v2 69134 2025-03-21 Enhancing rheological and self-healing properties of aged bitumen using a pyro-rejuvenator from waste tyres 73c6854ebb10465fbf7faab297135641 0000-0001-8327-2236 Jose Norambuena-Contreras Jose Norambuena-Contreras true false 2025-03-21 ACEM The progressive ageing of bitumen in road construction, driven by environmental and traffic conditions, presents a significant challenge in pavement engineering. This ageing process reduces the lifespan of the asphalt roads and their intrinsic self-healing capabilities to seal cracks. To address this issue from a waste valorisation perspective, the present study proposes using a pyro-rejuvenator (PR), obtained by pyrolysis of waste tyres and optimised by thermal fractionation, as a novel rejuvenating agent for aged asphalts. The effects of the PR at different dosages (3%, 6%, and 9% wt. of bitumen) on the chemical, rheological, and self-healing properties of long-term aged bitumen (PAV) were evaluated. In this study, a commercial rejuvenator (CR) was also used at equivalent dosages for comparison. The effect of the type and content of the rejuvenators on the PAV-aged bitumen samples was evaluated through chemical properties. This analysis included the change in the carbonyl (C = O) and sulfoxide (S2= O) functional groups in bitumen molecules by FTIR-ATR tests. Additionally, rheological tests using a Dynamic Shear Rheometer (DSR) on bitumen samples were also carried out to evaluate changes in the dynamic shear modulus (|G*|) and phase angle (δ) through frequency-temperature sweep tests. A methodology was also developed to quantify the self-healing capability of modified bitumen by measuring the recovery of the |G*| in fatigue DSR tests. The results indicate that the addition of PR up to 6% wt.: i) restored the changes in the carbonyl and sulfoxide functional groups of a PAV-aged bitumen to levels between a short-term aged bitumen (RTFO) and an unaged state; ii) promoted the restoration of the |G*| and of the PAV-aged bitumen to levels comparable to an unaged bitumen, and iii) promoted the healing of the PAV-aged sample. In conclusion, this research highlights the potential of the pyro-rejuvenator as a sustainable solution for improving the rheological and self-healing properties of aged bitumen. These findings also support its use as an alternative additive to enhance the chemo-mechanical properties of aged bitumen, particularly in mixtures with high Reclaimed Asphalt Pavement (RAP) content, among other applications. Journal Article Construction and Building Materials 470 140639 Elsevier BV 0950-0618 1 4 2025 2025-04-01 10.1016/j.conbuildmat.2025.140639 https://doi.org/10.1016/j.conbuildmat.2025.140639 COLLEGE NANME Aerospace, Civil, Electrical, and Mechanical Engineering COLLEGE CODE ACEM Swansea University 2025-03-21T11:04:36.5053644 2025-03-21T11:00:59.4390009 Faculty of Science and Engineering School of Aerospace, Civil, Electrical, General and Mechanical Engineering - Civil Engineering Manuel Chávez-Delgado 0000-0002-0821-667x 1 Jose L. Concha 2 Silvia Caro 0000-0003-2726-3575 3 Luis E. Arteaga-Pérez 0000-0003-3982-4165 4 Jose Norambuena-Contreras 0000-0001-8327-2236 5
title Enhancing rheological and self-healing properties of aged bitumen using a pyro-rejuvenator from waste tyres
spellingShingle Enhancing rheological and self-healing properties of aged bitumen using a pyro-rejuvenator from waste tyres
Jose Norambuena-Contreras
title_short Enhancing rheological and self-healing properties of aged bitumen using a pyro-rejuvenator from waste tyres
title_full Enhancing rheological and self-healing properties of aged bitumen using a pyro-rejuvenator from waste tyres
title_fullStr Enhancing rheological and self-healing properties of aged bitumen using a pyro-rejuvenator from waste tyres
title_full_unstemmed Enhancing rheological and self-healing properties of aged bitumen using a pyro-rejuvenator from waste tyres
title_sort Enhancing rheological and self-healing properties of aged bitumen using a pyro-rejuvenator from waste tyres
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
Luis E. Arteaga-Pérez
Jose Norambuena-Contreras
format Journal article
container_title Construction and Building Materials
container_volume 470
container_start_page 140639
publishDate 2025
institution Swansea University
issn 0950-0618
doi_str_mv 10.1016/j.conbuildmat.2025.140639
publisher Elsevier BV
college_str Faculty of Science and Engineering
hierarchytype
hierarchy_top_id facultyofscienceandengineering
hierarchy_top_title Faculty of Science and Engineering
hierarchy_parent_id facultyofscienceandengineering
hierarchy_parent_title Faculty of Science and Engineering
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
url https://doi.org/10.1016/j.conbuildmat.2025.140639
document_store_str 0
active_str 0
description The progressive ageing of bitumen in road construction, driven by environmental and traffic conditions, presents a significant challenge in pavement engineering. This ageing process reduces the lifespan of the asphalt roads and their intrinsic self-healing capabilities to seal cracks. To address this issue from a waste valorisation perspective, the present study proposes using a pyro-rejuvenator (PR), obtained by pyrolysis of waste tyres and optimised by thermal fractionation, as a novel rejuvenating agent for aged asphalts. The effects of the PR at different dosages (3%, 6%, and 9% wt. of bitumen) on the chemical, rheological, and self-healing properties of long-term aged bitumen (PAV) were evaluated. In this study, a commercial rejuvenator (CR) was also used at equivalent dosages for comparison. The effect of the type and content of the rejuvenators on the PAV-aged bitumen samples was evaluated through chemical properties. This analysis included the change in the carbonyl (C = O) and sulfoxide (S2= O) functional groups in bitumen molecules by FTIR-ATR tests. Additionally, rheological tests using a Dynamic Shear Rheometer (DSR) on bitumen samples were also carried out to evaluate changes in the dynamic shear modulus (|G*|) and phase angle (δ) through frequency-temperature sweep tests. A methodology was also developed to quantify the self-healing capability of modified bitumen by measuring the recovery of the |G*| in fatigue DSR tests. The results indicate that the addition of PR up to 6% wt.: i) restored the changes in the carbonyl and sulfoxide functional groups of a PAV-aged bitumen to levels between a short-term aged bitumen (RTFO) and an unaged state; ii) promoted the restoration of the |G*| and of the PAV-aged bitumen to levels comparable to an unaged bitumen, and iii) promoted the healing of the PAV-aged sample. In conclusion, this research highlights the potential of the pyro-rejuvenator as a sustainable solution for improving the rheological and self-healing properties of aged bitumen. These findings also support its use as an alternative additive to enhance the chemo-mechanical properties of aged bitumen, particularly in mixtures with high Reclaimed Asphalt Pavement (RAP) content, among other applications.
published_date 2025-04-01T08:19:37Z
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score 11.055114

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