Healing characteristics of asphalt binder

Yiqiu Tan, Liyan Shan, Y. Richard Kim, B. Shane Underwood

Research output: Contribution to journalArticle

47 Scopus citations

Abstract

The healing performance of asphalt binder has a critical impact on the fatigue performance of asphalt binders, mixture and pavement. Although studies of the healing characteristics of asphalt binder can be found in some references, the subject has not been researched thoroughly. No universal healing evaluation index currently exists, and the fatigue and healing processes are not fully understood. For this study, experiments were performed to characterize the healing characteristics of four typical asphalt binders. Healing indices are put forward, and factors that affect healing performance are examined in this paper. Finally, the fatigue and healing processes of asphalt binder are investigated by analyzing test specimen cross-sections. The findings from this study, although based on a limited number of binders, suggests that HI 1 (the modulus ratio) and HI2 (the cycle number ratio) are suitable healing indices. Rest periods and microstructural configurations significantly affect the healing performance of asphalt binder. Healing affects the fatigue performance only when the modulus value is greater than the modulus value when rest periods are applied. During fatigue testing, damage starts at the outer edge of the specimen, and then develops towards the middle of the specimen.

Original languageEnglish (US)
Pages (from-to)570-577
Number of pages8
JournalConstruction and Building Materials
Volume27
Issue number1
DOIs
StatePublished - Feb 1 2012

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Keywords

  • Asphalt binder
  • Dynamic modulus
  • Fatigue
  • Healing characteristic

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Building and Construction
  • Materials Science(all)

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