Abstract for presentation (Poster or Podium) with a Paper in the Conference Proceedings
Highway Pavements
Sagar Ghos, MS
Graduate Research Assistant
University of Oklahoma
Norman, Oklahoma, United States
Sagar Ghos, MS
Graduate Research Assistant
University of Oklahoma
Norman, Oklahoma, United States
Mehrun Nisa, n/a
Graduate Research Assistant
University of Oklahoma
Norman, Oklahoma, United States
David Vivanco, PE
Asphalt Branch Manager
Oklahoma Department of Transportation
Edmond, Oklahoma, United States
Syed A. Ali, PhD
Post-Doctoral Research Associate
University of Oklahoma
Norman, OK, United States
Musharraf Zaman, Ph.D., PE
David Ross Boyd and Aaron Alexander Professor in Civil Engineering
University of Oklahoma
Norman, Oklahoma, United States
Kenneth R. Hobson, PE
Asphalt Lab Manager
University of Oklahoma
Norman, Oklahoma, United States
Sagar Ghos, MS
Graduate Research Assistant
University of Oklahoma
Norman, Oklahoma, United States
Significant amounts of Reclaimed Asphalt Pavement (RAP) are being generated each year from milling and full-depth removal operations in Oklahoma. The recently published Oklahoma Department of Transportation (ODOT) special provision for Balanced Mix Design (BMD) allows a maximum of 15% and 20% RAP (by weight of the mix) for surface and base courses, respectively. Increasing the incorporation of RAP into asphalt mixes offers promising benefits, including a reduced carbon footprint, resource conservation, sustainability, and cost savings for taxpayers. ODOT is interested in increasing the amount of RAP in BMD mixes without compromising pavement performance. This study is aimed at maximizing the RAP content in asphalt mixes. For this purpose, three asphalt mixes were designed incorporating 0%, 20%, and 40% RAP and rejuvenator. The BMD Approach B, volumetric design with performance optimization, as mentioned in AASHTO PP 105 was followed for this purpose. Volumetric and performance properties of the mixes were evaluated. To achieve this, theoretical maximum specific gravity, bulk specific gravity, Hamburg Wheel Tracking (HWT), Indirect Tensile Asphalt Cracking Test (IDEAL-CT), Indirect Tensile Strength (ITS), and Dynamic Modulus (DM) were performed. Moreover, cracking performance of these mixes were evaluated under three aging conditions, namely short-term, mid-term, and long-term aging. Furthermore, the effect of RAP content on the dynamic modulus and phase angle were evaluated. Additionally, Pavement ME Design (PMED) simulations were carried out using Level 1 input for these three mixes to predict their performance under Oklahoma conditions. This study is anticipated to offer valuable insights into the performance of asphalt mixes with high RAP content.