Influence of Asphalt Binder Oxidative Aging on Critical Thermal Cracking Characteristics of Asphalt Mixtures

Through analyses of thermo-volumetric (Coefficient of Thermal Contraction [CTC]), thermo-viscoelastic (stiffness-temperature relationship), crack initiation and fracture, and damage characterization parameters, the influence of oxidative aging of asphalt binders on the thermal cracking characteristics of asphalt mixtures was evaluated. Laboratory-prepared specimens aged for multiple durations in laboratory ovens were utilized to evaluate these properties. The linear viscoelastic solution of thermally stressed mixture characterization determined though the Uniaxial Thermal Stress and Strain Test (UTSST) formed the basis of the thermo-viscoelastic characterization. It was determined that the crack initiation stress and temperature which was additionally supported by the Viscoelastic Continuum Damage (VECD) methodology was a critical aspect of the UTSST measurements. Corresponding measurements of the core specimens from the nearly 20 year in-service WesTrack field sections were used to obtain validation of the evolution of the thermal cracking characteristics of the mixtures with aging.

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  • English

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  • Accession Number: 01606990
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Jul 27 2016 12:22PM