Effects of SARA Fractions on Low Temperature Properties of Asphalt Binders

Effects of chemical fraction on the low temperature rheological behaviors of asphalt binders were explored in this study. Four fractions, namely saturate, aromatic, resin and asphaltene (SARA), were obtained from eleven asphalt binders by a modified separation method. In addition, saturates, aromatics, resins and asphalt binders were characterized by dynamic shear rheometer (DSR). The viscoelastic master curves for complex shear modulus and phase angle were built to reveal the relationship between SARA fractions and asphalt binder at high frequencies (low temperatures). The results showed that the complex modulus and phase angle of asphalt binders were closely related to the changes of SARA fractions. Moreover, low temperature properties of asphalt binders characterized by the creep stiffness modulus and m-value were measured using bending beam rheometer (BBR) test. The increases of asphaltene in asphalt binder resulted in the decreases of creep stiffness modulus of asphalt as well as m-value. Further, the glass transition temperature (Tg) of resins, asphaltenes and asphalt binders were measured by differential scanning calorimetry (DSC) test. The results showed that the Tg values of asphalt binders were mainly determined by saturates and aromatics fractions. However, the Tg values of asphalt binder would increase with the increase of asphaltene content. Finally, significant relationships between SARA fractions and low temperature parameters of asphalt binder specimens were found and conducted using linear regression analysis, indicating that the SARA fractions would perform significant effects on the low temperature properties of asphalt binders.

• Supplemental Notes:
  • This paper was sponsored by TRB committee AFK20 Standing Committee on Asphalt Binders.
• Corporate Authors:

  Transportation Research Board

  ,    
• Authors:
  • Wang, Tao
  • 0000-0001-9619-8717
  • Wang, Jiayu
  • Hou, Xiangdao
  • Xiao, Feipeng
• Conference:
  • Transportation Research Board 98th Annual Meeting
  • Location: Washington DC, United States
  • Date: 2019-1-13 to 2019-1-17
• Date: 2019

Language

• English

Media Info

• Media Type: Digital/other
• Features: Figures; References;
• Pagination: 7p

Subject/Index Terms

• TRT Terms: Asphaltene; Bituminous binders; Low temperature; Low temperature fluidity; Mechanical properties
• Subject Areas: Highways; Materials; Pavements;

Filing Info

• Accession Number: 01697320
• Record Type: Publication
• Report/Paper Numbers: 19-03547
• Files: TRIS, TRB, ATRI
• Created Date: Mar 1 2019 3:50PM