Influence of Waste Engine Oil on Asphalt Mixtures Containing Reclaimed Asphalt Pavement

Abstract

This paper presents the results from a laboratory study in which the influence of waste engine oil on the performance of hot-mix asphalt (HMA) containing reclaimed asphalt pavement (RAP) was evaluated. The lab test consists of binder test and mixture test. For binder test, the extracted RAP binder was blended with virgin binder and waste oil to investigate the rheological properties as well as fatigue properties. The waste engine oil was collected from a local auto repair shop. Performance Grade 64-22 was selected as virgin binder. For mixture test, the HMA containing RAP was evaluated at three RAP contents [(1) 0%, (2) 25%, and (3) 40%] and three waste oil contents [(1) 0%, (2) 2%, and (3) 5%]. Binder master curves, linear amplitude sweep, Superpave indirect tension, beam fatigue, and asphalt pavement analyzer rutting tests were conducted to evaluate the engineering properties of asphalt and asphalt mixtures. The results from the research reported in this paper indicated that the incorporation of waste engine oil into HMA with RAP may offset the increase of stiffness caused by aged binder in RAP. The inclusion of waste engine oil decreased optimum asphalt content, and reduced rut resistance. Meanwhile, it may also have limited improvements on fatigue resistance of the mixtures.