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

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

doi:10.1016/j.conbuildmat.2025.140639

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

Manuel Chávez-Delgado

, Jose L. Concha, Silvia Caro

, Luis E. Arteaga-Pérez

, Jose Norambuena-Contreras

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

Swansea University Author: Jose Norambuena-Contreras

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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
Online Access:	Check full text
URI:	https://cronfa.swan.ac.uk/Record/cronfa69134

first_indexed	2025-03-21T11:04:38Z
last_indexed	2025-04-11T05:22:17Z
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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.</abstract><type>Journal Article</type><journal>Construction and Building Materials</journal><volume>470</volume><journalNumber/><paginationStart>140639</paginationStart><paginationEnd/><publisher>Elsevier BV</publisher><placeOfPublication/><isbnPrint/><isbnElectronic/><issnPrint>0950-0618</issnPrint><issnElectronic/><keywords>Aged bitumen; Tyre pyrolytic oil; Asphalt rejuvenator; Rheological properties; Self-healing</keywords><publishedDay>4</publishedDay><publishedMonth>4</publishedMonth><publishedYear>2025</publishedYear><publishedDate>2025-04-04</publishedDate><doi>10.1016/j.conbuildmat.2025.140639</doi><url/><notes/><college>COLLEGE NANME</college><department>Aerospace, Civil, Electrical, and Mechanical Engineering</department><CollegeCode>COLLEGE CODE</CollegeCode><DepartmentCode>ACEM</DepartmentCode><institution>Swansea University</institution><apcterm/><funders>The authors want to thank the financial support from the National Research and Development Agency (ANID) from Chile through the Research Project FONDEF IDeA 21I10127. 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spelling	2025-04-10T11:19:17.6770042 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 Aged bitumen; Tyre pyrolytic oil; Asphalt rejuvenator; Rheological properties; Self-healing 4 4 2025 2025-04-04 10.1016/j.conbuildmat.2025.140639 COLLEGE NANME Aerospace, Civil, Electrical, and Mechanical Engineering COLLEGE CODE ACEM Swansea University The authors want to thank the financial support from the National Research and Development Agency (ANID) from Chile through the Research Project FONDEF IDeA 21I10127. Additionally, the first author wishes to thank the financial support given by the University of Bío-Bío for his internal PhD scholarship granted. 2025-04-10T11:19:17.6770042 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 69134__33854__528cf04a09ed4b9aaa537cd59ec0e7e9.pdf 69134.pdf 2025-03-21T11:04:29.7216996 Output 1717310 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	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
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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	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	2025-04-04T05:23:08Z
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score	11.089988

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

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