Date Approved

9-27-2022

Embargo Period

9-29-2022

Document Type

Thesis

Degree Name

M.S. Civil Engineering

Department

Civil and Environmental Engineering

College

Henry M. Rowan College of Engineering

Advisor

Yusuf Mehta, Ph.D., P.E.

Committee Member 1

Cheng Zhu, Ph.D., P.E.

Committee Member 2

Daniel Offenbacker, Ph.D.

Keywords

100% RAP, Asphalt Binder, Hot Asphalt Recycling, Patching Repairs, Recycled Asphalt Pavement (RAP), Rejuvenators

Subject(s)

Pavements--Performance; Pavements--Maintenance and repair

Disciplines

Civil and Environmental Engineering

Abstract

The goal of this study was to present a procedure for performance-related mix design of 100% recycled asphalt pavement (RAP) mixtures used in repair applications. In addition, the impact of rejuvenators (Corn Oil, Tall Oil, Modified Vegetable Oil, and Aromatic Extract) on the RAP materials' properties were also investigated on both levels (binder, and mixtures). Performance grade testing, frequency sweep test, critical temperature differential (delta Tc), and Fourier Transform Infrared Spectroscopy (FTIR) tests were conducted to evaluate the rheological and chemical properties of extracted and rejuvenated RAP binders. Afterward, asphalt pavement analyzer (APA) and indirect tensile asphalt cracking (IDEAL-CT) tests were conducted on the rejuvenated RAP mixtures to investigate its rutting and cracking performance, respectively. Finally, the shear bond between conventional HMA and the rejuvenated RAP mixtures was investigated using the interlayer shear bond strength (ISS) test. Results showed that the use of rejuvenators lowered the high and low performance grade of extracted RAP binders. Further, rejuvenators increased the rutting susceptibility of the RAP mixtures to rut depth, where the values were beyond the maximum threshold of 10mm. Rejuvenators also enhanced the cracking performance of the RAP mixture to comparable level, where CTindex values were near the threshold value of 70. It also was observed that, all mixtures showed higher interlayer shear strength (ISS) values than minimum required of 276 KPa.

Download

Share

COinS