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Thermo-rheological analysis of WMA-additive modified binders

Abed, Ahmed; Thom, Nick; Lo Presti, Davide; Airey, Gordon


Ahmed Abed

Assistant Professor

Davide Lo Presti

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Professor of Pavement Engineering Materials


Thermo-rheological characteristics of unmodified and modified bitumen have significant impacts on the mechanical response of asphalt. This study investigates the impacts of an organic and a chemical Warm Mix Asphalt additive on bitumen thermo-rheological and mechanical characteristics. Modified binders with different concentrations of each additive were studied and analysed comparatively to a 40/60 penetration grade bitumen. Frequency sweep tests were performed at different ageing levels to characterise the Linear Viscoelastic properties. The multiple stress creep and recovery, linear amplitude sweep (LAS) and low temperature creep stiffness tests, together with the Glover–Rowe (G–R) fatigue parameter (determined from fitting of the 2S2P1D model to the complex shear modulus and phase angle master curves) were used to analyse the performance of the binders at critical operating temperatures. The results demonstrated the necessity to analyse the behavior of the studied binders beyond the limits of linear viscoelasticity to better characterise these types of bitumen. The results also indicated that both additives retarded bitumen ageing with the organic additive increasing bitumen elastic response while the chemical additive increased its viscous response. The results also showed an excellent correlation between the G–R parameter and LAS results which suggests the ability to use this parameter in characterising fatigue performance of the studied binders. This also suggests that bitumen fatigue life may be improving over time due to the increased elastic behahviour during ageing so long as a certain critical level of ageing is not reached.


Abed, A., Thom, N., Lo Presti, D., & Airey, G. (2020). Thermo-rheological analysis of WMA-additive modified binders. Materials and Structures, 53(3),

Journal Article Type Article
Acceptance Date Apr 7, 2020
Online Publication Date Apr 29, 2020
Publication Date 2020-06
Deposit Date May 1, 2020
Journal Materials and Structures
Print ISSN 1359-5997
Electronic ISSN 1871-6873
Publisher Springer Verlag
Peer Reviewed Peer Reviewed
Volume 53
Issue 3
Article Number 52
Keywords General Materials Science; Mechanics of Materials; Civil and Structural Engineering; Building and Construction
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Additional Information Received: 19 November 2019; Accepted: 7 April 2020; First Online: 29 April 2020; : ; : The authors declare that they have no conflict of interest.