Abstract

Waste engine oil (WEO) modified asphalt was prepared by melt blending. The objective of this paper is to investigate the influence of WEO on the physical properties, chemical compositions and microstructure of asphalt. Penetration, softening point and ductility were tested to evaluate the effect of WEO on basic properties of asphalt. Then the rheological properties of modified asphalts were characterized based on rotational viscometer (RV), bending beam rheometer (BBR) and dynamic shear rheometer (DSR) tests. Finally, SARA (saturates, aromatics, resins and asphaltenes) fractions, Pyrolysis-gas chromatography (PyGC) and Fourier transform infrared spectroscopy (FTIR) tests were carried out to investigate the influence of WEO on chemical properties of asphalt. The experimental results indicate that the chemical compositions of WEO is similar to asphalt with similarity-intermiscibility characteristics, and both are mainly physical blending rather than chemical reaction. The addition of WEO can reduce the viscosity, the colloidal instability index (Ic) value, the Carbonyl (C=O) and Sulfoxide (S=O) indexes of asphalt. Moreover, the viscous components of asphalt are significantly increased in low temperature. It is beneficial to the anti-aging properties and low-temperature crack resistance of asphalt, while the temperature sensitivity and high-temperature stability of asphalt remains to be further improved.

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