Resource conservation and environmental protection are arguably the primary aims of practically all researchers associated with engineering projects. With this in mind, the present study aims to experimentally and statistically investigate the role of waste engine oil (WEO) as a suitable asphalt rejuvenating agent. For this purpose, three aged asphalt binders were extracted from different reclaimed pavement samples. The test samples were composed of virgin, aged, and WEO-blended binders where dosages of 3, 6, and 9% (by weight of binder) were added after the filtration and heating process. These samples were subjected to various testing methods, including physical, chemical, rheological, and Fourier-transform infrared spectroscopy (FTIR) tests. The addition of WEO was found to efficiently restore the asphalt's desirable properties depleted by aging, with 9% found to be the optimum content. In addition, each one percent of added WEO restored the values of the asphaltenes, aromatics, resins, and saturates by 4.3, 1.36, 1.31, and 0.5%, respectively. The FTIR analysis revealed a reduction in carbonyl and sulfoxide indices' values when using WEO agent. This change in chemical composition amendment was reflected by enhanced rheological properties, as the complex shear modulus returned to 84% of its original value when the WEO content reached 9%. Furthermore, the internal colloidal index was also computed and statistically correlated with the rheological parameters. Finally, this study developed models correlating the effect of the rejuvenation process on fatigue and rutting performance.
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