Abstract
Red mud, a promising asphalt modifier, can improve comprehensive performance of asphalt. However, the compatibility and performance of organic red mud modified asphalt are also worthy of attention. In this study, organic red mud was prepared with oxalic acid and coupling agent (also called surface modification), and then characterized by Fourier transform infrared spectroscopy (FTIR), field emission scanning microscope (FESEM), nitrogen gas adsorption–desorption system (BET) and ultraviolet visible (UV–visible) tests. The application of prepared organic red mud in asphalt modification was explored, including basic performance and aging resistance. The results show that organic red mud prepared by chemical reaction has more uniform particles distribution, smaller specific surface area and stronger ultraviolet reflectivity. After surface modification, the inorganic red mud filler changes from hydrophilic to hydrophobic, and the interaction with asphalt is enhanced, which improves the basic performance of asphalt. More importantly, organic red mud can be homogeneously dispersed in asphalt to inhibit the diffusion of heat and oxygen, and it can reduce the ultraviolet damage to asphalt. Consequently, the thermo-oxidative and ultraviolet aging resistance of asphalt are further enhanced.
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