Parametric Analysis and Field Validations of Oxidative Ageing in Asphalt Pavements using Multiphysics Modelling Approaches

Eman Omairey, Yuqing Zhang*, Hilde Soenen, Xavier Carbonneau

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

Oxidative ageing in field asphalt pavements is a complex process with coupled multiple physics. This parametric study uses Multiphysics modelling approaches to evaluate the effects of material thermal properties, air voids content and distribution, mastic coating thickness, oxygen accessibility and binder oxidative kinetics on the spatial and temporal evolution of the oxidative ageing in the asphalt pavements. Results suggest that increasing the thermal conductivity of asphalt layers leads to a lower ageing gradient. The variations of base and subgrade layers’ thermal properties cause little to no effects on the oxidative ageing. A high activation energy of the asphalt binder (e.g. by adding anti-ageing additives) reduces the oxidative ageing significantly. Asphalt layers built on unbound granular base will experience greater overall ageing with a C-shaped ageing gradient compared to that built on treated base. Air voids content of <5% yields limited oxidative ageing. Five to nine percent air voids generate a gradually increased oxidative ageing with an obvious gradient across pavement depth. Air voids content beyond 9% leads to a consistently high oxidative ageing due to a full access to the oxygen. Finally, the findings were validated using available literature results and field data from 14 European road sections.
Original languageEnglish
JournalInternational Journal of Pavement Engineering
Early online date9 Jan 2022
DOIs
Publication statusE-pub ahead of print - 9 Jan 2022

Bibliographical note

© 2022 The Author(s). Published with license by Taylor & Francis Group, LLC
This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Keywords

  • Asphalt pavements
  • Oxidative ageing
  • Parametric analysis
  • Air voids content
  • Ageing gradient

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