UTC 2022 Funding - Cycle 2 Research Projects

Project No.: CY3-OSU-OU-11
Title: Assessing the Durability and Long-Term Performance of Rejuvenated Asphalt Mixes with RAP
Performing Institution: Oklahoma State University and University of Oklahoma
Principal Investigator: Mohamed Elkashef, Oklahoma State University; Syed Ashik Ali, University of Oklahoma
Co-Principal Investigator: Musharraf Zaman, University of Oklahoma
Start and Anticipated Completion Dates: 01/01/2026 to 01/15/2027
Abstract: This research idea addresses an important ODOT need to use higher amounts of recycled materials in asphalt mixes, which is essential for the statewide implementation of Balanced Mix Design (BMD). Rejuvenators have been used successfully to restore the properties of asphalt mixes containing Reclaimed Asphalt Pavement (RAP). There is a wide variety of petroleum-based and bio-based rejuvenators available commercially that purport to improve the performance of asphalt mixes with RAP. A crucial aspect of the design of these mixes is to ensure durability and long-term performance. Some additives may only impart a short-term effect and aid in mix compaction without showing a sustained long-term effect on performance. In this study, rejuvenated asphalt mixes with RAP will be prepared, using local materials from Oklahoma, and assessed to evaluate their long-term performance, including raveling resistance and stripping susceptibility. A comprehensive testing plan will be developed and conducted for testing of both asphalt binder and asphalt mixture. The test plan includes mixture testing to assess the moisture susceptibility using Tensile Strength Ratio (TSR) and Hamburg Wheel Tracking (HWT) tests. The HWT test results will be analyzed using the corrected rut depth (CRD) and striping number (SN) parameters to evaluate rutting and moisture resistance. The mixes will also be tested using IDEAL-CT at both short-term aged and long-term aged conditions to ensure durability and balanced performance. The binder testing will include evaluating the rheological properties of the binders at extended Pressure Aged Vessel (PAV) aging durations. The binders will also be evaluated using Fourier Transform Infrared (FTIR) spectroscopy to assess aging susceptibility. The proposed study will provide valuable information on the effectiveness of rejuvenators on asphalt mixture performance during service life. The findings of this study will be used to propose specification requirements for rutting, cracking, and moisture-induced damage for rejuvenated asphalt mixes considering long-term performance and durability. 
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