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Optimising the dosage of bio-rejuvenators in asphalt recycling: A rejuvenation index based approach

Hu, Yongping; Ryan, Jack; Sreeram, Anand; Allanson, Max; Pasandín, Ana R.; Zhou, Lu; Singh, Bhupendra; Wang, Haopeng; Airey, Gordon D.

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Authors

Yongping Hu

Jack Ryan

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ANAND SREERAM Anand.Sreeram@nottingham.ac.uk
Assistant Professor in Transportation Engineering

Max Allanson

Ana R. Pasandín

Bhupendra Singh

Haopeng Wang

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GORDON AIREY GORDON.AIREY@NOTTINGHAM.AC.UK
Professor of Pavement Engineering Materials



Abstract

While significant research efforts have been devoted to the rejuvenation of aged bitumen using bio-rejuvenators, a universally recognised approach for dosage optimisation is still yet to be established. Aiming to develop standardised methods to determine the optimal dosages of six types of bio-rejuvenators, this study validated the use of a rheology-based rejuvenation index as a potential universal method. Rheological properties of rejuvenated binders, determined through frequency sweep tests, multiple stress creep and recovery tests, linear amplitude sweep tests, and bending beam rheometer (BBR) tests were carried out with the properties of virgin binder as reference targets. The results indicated that the applied rheology-based rejuvenation index is a feasible approach. This index can ensure improved low- and intermediate-temperature (fatigue) performance of aged bitumen while maintaining high-temperature performance within acceptable limits. Further characterisation of the binders by Fourier Transform Infrared Spectroscopy (FTIR) analysis suggested that the bio-rejuvenation processes will commonly only involve physical softening rather than a chemical reversal of ageing. Therefore, the use of chemistry-based indices is likely not feasible.

Journal Article Type Article
Acceptance Date May 21, 2024
Online Publication Date May 24, 2024
Publication Date Jun 28, 2024
Deposit Date May 24, 2024
Publicly Available Date May 24, 2024
Journal Construction and Building Materials
Print ISSN 0950-0618
Electronic ISSN 1879-0526
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 433
Article Number 136761
DOI https://doi.org/10.1016/j.conbuildmat.2024.136761
Keywords Bitumen; Rejuvenation; Dosage; Fatigue; Rheology; FTIR
Public URL https://nottingham-repository.worktribe.com/output/35159000
Publisher URL https://www.sciencedirect.com/science/article/pii/S0950061824019032?via%3Dihub
Additional Information This article is maintained by: Elsevier; Article Title: Optimising the dosage of bio-rejuvenators in asphalt recycling: A rejuvenation index based approach; Journal Title: Construction and Building Materials; CrossRef DOI link to publisher maintained version: https://doi.org/10.1016/j.conbuildmat.2024.136761; Content Type: article; Copyright: © 2024 The Author(s). Published by Elsevier Ltd.

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