Property transitions of neat and styrene–butadiene-styrene (SBS)-modified asphalt binders from small, medium to large-amplitude oscillatory shears

Xiaoxu Zhu, Miomir Miljković, Yuhong Wang, Gengren Hao

Research output: Journal article publicationJournal articleAcademic researchpeer-review

Abstract

Tests on asphalt binder are typically performed in its linear viscoelastic (LVE) range. In this research, the rheological properties of neat and styrene–butadiene-styrene (SBS)-modified asphalt binders were examined from 0.01% to 1000% at a high usage temperature, and focus was placed on their non-linear viscoelastic (NLVE) behaviours. Experimental variations and binder property changes in small, medium and large-amplitude oscillatory shears were revealed. Besides strain amplitude, the effects of polymer content, short-term aging and test frequency on NLVE behaviours were also analysed based on three quantitative methods. Additionally, polymers in asphalt binders were examined by using confocal fluorescence microscopy. The NLVE behaviours were found to be affected by shear strain amplitude, polymer content, shear frequency, and the interactions of such factors, but to a less extent by short-term aging. Besides polymer content, the size and morphology of polymer phase likely affect the property variations of modified asphalt binders. Large amplitude oscillatory shear (LAOS) test and morphology analysis help identify the threshold polymer content in producing high-quality polymer-modified asphalt binders.

Original languageEnglish
JournalInternational Journal of Pavement Engineering
DOIs
Publication statusAccepted/In press - 2022

Keywords

  • confocal fluorescence microscopy
  • Fourier transform (FT) rheology
  • large amplitude oscillatory shear (LAOS)
  • non-linear viscoelastic (NLVE) behaviours
  • SBS-modified asphalt binder
  • stress decomposition

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Mechanics of Materials

Cite this