Strategies for Incorporating High Reclaimed Asphalt Pavement (RAP) Contents in Asphalt Mixtures

Utilization of high contents of reclaimed asphalt pavement (RAP) has become a common practice to reduce construction costs of asphalt pavements, maintain dwindling natural resources, and improve sustainability. However, this practice poses technical challenges in terms of asphalt mixture production, compaction, and long-term cracking performance. To meet these challenges, mixture component and/or proportioning adjustments are recommended such as employing a softer base binder and/or adding a recycling agent (also called rejuvenator) at a specified dose. In this study, the effect of these adjustments on asphalt mixtures was evaluated via resilient modulus (MR) test, dynamic modulus (|E*|) test, Illinois flexibility index test (I-FIT), disk-shaped compact tension (DCT) test, bending beam rheometer for asphalt mixtures (BBRm) test, uniaxial thermal stress and strain test (UTSST), Hamburg wheel-track test (HWTT), and asphalt pavement analyzer (APA). The effect of these adjustments was also evaluated via the rheological properties of binder blends using the dynamic shear rheometer (DSR) frequency sweep test. Test results showed that only the mixtures/blends with an appropriate dose of recycling agent consistently yielded the best performance among others, after short- and long-term aging conditions.

• Supplemental Notes:
  • This paper was sponsored by TRB committee AFK30 Standing Committee on Non-Binder Components of Asphalt Mixtures.
• Corporate Authors:

  Transportation Research Board

  ,    
• Authors:
  • Kaseer, Fawaz
  • 0000-0002-9443-4429
  • Bajaj, Akash
  • Martin, Amy Epps
  • Arambula Mercado, Edith
  • Hajj, Elie
• 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; Tables;
• Pagination: 8p

Subject/Index Terms

• TRT Terms: Asphalt additives; Asphalt mixtures; Reclaimed asphalt pavements; Recycled materials
• Subject Areas: Highways; Materials; Pavements;

Filing Info

• Accession Number: 01697826
• Record Type: Publication
• Report/Paper Numbers: 19-00546
• Files: TRIS, TRB, ATRI
• Created Date: Mar 1 2019 3:51PM