Fatigue Tolerance of Aged Asphalt Binders Modified with Softeners

Fatigue cracking caused by repeated heavy traffic loading is a critical distress in asphalt concrete pavements and is significantly affected by the selected binder. In recent years, the growing use of recycled asphalt materials has increased the need for the production of softer asphalt binder. Various modifiers/additives are marketed to adjust the grade and/or enhance the binder performance at high and low temperatures. The modifiers are expected to alter the rheological and chemical characteristics of binders and, therefore, their performance. In this study, the damage characteristics of modified and unmodified binders, at standard long-term and extended aging conditions, were tested using the linear amplitude sweep (LAS) test. Current data-interpretation methods for LAS measurements (including AASHTO TP 101-12, T 391-20, and recent literature) showed inconsistent results for modified binders. An alternative method to interpret LAS results was developed in this study. The method considers the data until peak shear-stress is reached because complex stress states and failure patterns are observed in the specimens after that point. The proposed parameter (?|G*|peak t) quantifies the reduction in complex shear modulus measured at the peak shear-stress. The parameter successfully captures the effect of aging and modification of binders.

• Record URL:
  https://doi.org/10.1177/03611981211025510
• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/03611981
• Supplemental Notes:
  • Javier J. García Mainieri https://orcid.org/0000-0002-8302-474X © National Academy of Sciences: Transportation Research Board 2021.
• Authors:
  • García Mainieri, Javier J
  • 0000-0002-8302-474X
  • Singhvi, Punit
  • 0000-0002-0468-2702
  • Ozer, Hasan
  • 0000-0003-1526-6840
  • Sharma, Brajendra K
  • 0000-0002-7035-9380
  • Al-Qadi, Imad L
  • 0000-0002-5824-103X
• Publication Date: 2021-11

Language

• English

Media Info

• Media Type: Web
• Features: References;
• Pagination: pp 1229-1244
• Serial:
  • Transportation Research Record: Journal of the Transportation Research Board
  • Volume: 2675
  • Issue Number: 11
  • Publisher: Sage Publications, Incorporated
  • ISSN: 0361-1981
  • EISSN: 2169-4052
  • Serial URL: http://journals.sagepub.com/home/trr

Subject/Index Terms

• TRT Terms: Aging (Materials); Bituminous binders; Fatigue cracking; Recycled materials; Rejuvenators; Shear modulus; Shear stress
• Subject Areas: Highways; Materials; Pavements;

Filing Info

• Accession Number: 01778906
• Record Type: Publication
• Files: TRIS, TRB, ATRI
• Created Date: Aug 10 2021 5:24PM