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Podium Presentation at the Conference

Asphalt Binder and Mixture Characterization

Session: Performance of Engineered Asphalt Binders

1373119 - Exploring the Utilization of Tailored Antioxidants for Asphalt Pavement Applications: A Global Effort Towards Pavement Resilience

Friday, June 16, 2023
4:00 PM – 4:15 PM CST
Room: 404
TRACK: J
Stiffening of asphalt binders due to oxidative aging is a significant factor that reduces the lifetime of asphalt pavements. The application of tailored antioxidants has potential to improve the serviceable life of flexible pavements by a substantial magnitude. However, previous studies in this area have been disparate and outcomes limited to the specific chemical makeup and sources of asphalt binders. This has severely inhibited the development of antioxidants. To overcome these gaps, researchers have been recently involved in a global research consortium for a coordinated study on this topic. The present work is a continuation of this global interlaboratory effort to assess the efficacy of potential antioxidants and enhance the understanding of the underlying mechanisms involved. Two specific antioxidants shown to offer significant promise when considering global binder diversity were blended with binders used in different geographical regions, specifically from Texas (USA), Vienna (Austria), Illinois (USA), and Antwerp (Belgium). Advanced rheological evaluations including poker chip tensile strength and ductility testing, frequency-temperature sweep testing, and chemical evaluation including SARA fractions determination were carried out on the blended binders to comprehend their chemical and rheological complexities. Results obtained shed significant insights into the chemo-mechanical properties of the modified binders and their efficacy when considering specific binder chemistry.

Learning Objectives:

Attendees can expect to learn the following from this session:
  • Upon completion, participants will be able to understand the effectiveness of antioxidants in asphalt binders.
  • Upon completion, participants will be able to understand aging related behaviour of asphalt binders.
  • Upon completion, participants will be able to understand antioxidant related effect of globally different asphalt binders.