A time-temperature-ageing shift model for bitumen and asphalt mixtures based on free volume theory

Hanyu Zhang, Yuqing Zhang

Research output: Contribution to journalArticlepeer-review

Abstract

This paper aims to develop a general form of the time-temperature-ageing shift model for bituminous materials based on free volume theory and validate its application in the Finite Element (FE) modelling for predicting aged asphalt mixtures’ mechanical responses. The frequency sweep, dynamic modulus, and Fourier Transform Infrared Spectroscopy (FTIR) tests were used to validate the proposed time-temperature-ageing shift model. A generalised Maxwell model incorporating the proposed shift model of asphalt mixtures was used to predict the mechanical responses of aged asphalt mixtures using FE modelling, verified via laboratory cyclic load tests. Results indicate that the time-temperature-ageing shift function can model the complex shear modulus and dynamic modulus master curves of bituminous materials, addressing the modulus dependency of temperature and ageing. Temperature dominates the modulus change of bituminous materials in the ageing process. The coefficients of the time-temperature-ageing shift model have clear physical meanings and can potentially quantify the effects of asphalt mixtures’ air voids on their temperature and ageing susceptibilities. The time-temperature-ageing shift model can be incorporated into the constitutive relations of the FE model to effectively couple and efficiently predict the effects of temperature and ageing on the mechanical responses of aged asphalt mixtures.
Original languageEnglish
Article number2138882
JournalInternational Journal of Pavement Engineering
Volume24
Issue number1
Early online date2 Feb 2023
DOIs
Publication statusPublished - 6 Dec 2023

Bibliographical note

Funding Information:
The authors would like to acknowledge the financial support of a PhD studentship provided by the University of Nottingham, Nynas, and Colas. The authors acknowledge Nynas and Colas for providing the bitumen testing data. This work is also supported by the Asphalt Institute Foundation (AIF).

Publisher Copyright:
© 2022 Informa UK Limited, trading as Taylor & Francis Group.

Keywords

  • Bituminous material
  • ageing
  • finite element modelling
  • free volume theory
  • master curve

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