High temperature property and modification mechanism of asphalt containing waste engine oil bottom

Abstract

This research explores the influence of waste engine oil bottom (WEOB) on the high temperature rheological property of two asphalt binders (i.e. base binder and SBS modified binder). For this study, these binders were first modified by WEOB with different contents (2, 4, and 6 wt%). The high temperature rheological properties were evaluated by viscosity, temperature sweep, and multiple stress creep and recovery (MSCR) tests. It is demonstrated that the incorporation of WEOB reduces the high temperature performance resistance and elastic property while enhances the viscous property of base binder, and the SBS modified binder exhibits an opposite tendency to the base binder. This effect on these properties is more significant with the increase of WEOB content. Studies for the modification mechanism was conducted via gas chromatography-mass spectrometry (GC–MS), Fourier transform infrared spectroscopy (FTIR) and fluorescence microscopy. Results indicate that the WEOB and binder matrix are coexistence in physical sense. The WEOB provides light components for base binder that help to the dissolution of more asphaltenes, thereby softening the base binder. The light components in WEOB induce the swelling of SBS network structures and then strengthen the barrier of SBS to the thermal motion of asphalt molecules.