Physical and Chemical Properties of Rejuvenating Aged Binder with Waste Cooking Oil and Its Bioasphalt

Abstract

WCO-based bioasphalt is prepared from waste cooking oil (WCO) by filter, deodorant, viscosity reduction, methyl ester and distillation. The objective of this study was to investigate the properties of rejuvenating aged asphalt binder with WCO-based bioasphalt and waste cooking oil. The materials used for this study included one virgin asphalt, aged asphalt (from virgin asphalt by thin film oven test and pressure aging vessel), waste cooking oil and its bioasphalt with five percentages (0, 3, 5, 7 and 9% of aged asphalt). The physical and rheological properties of these rejuvenated asphalts were tested including penetration, softening point, ductility, rotational viscosity, complex modulus and phase angle, creep stiffness (S) and creep rate (m-value). The chemical characteristics were evaluated using Fourier Transforms Infrared Spectroscopy (FTIR). The results indicate the physical and rheological properties of rejuvenate asphalts are closed to that of virgin asphalt with the dosages increased. Besides, the low temperature performance of rejuvenated asphalts is better compared with the aged asphalt while the high temperature anti-rutting performance need to be further improved. The carbonyl and sulfoxide indexes of rejuvenated asphalts are significantly lower than that of aged asphalt. In addition, the regenerated asphalts containing waste cooking oil show better performance than the ones containing WCO-based bioasphalt at the same condition. Thus, the light components can be separated from the waste cooking oil and used for other purposes, which makes the waste cooking oil have a reasonable use and broaden the application way.