Ultraviolet Aging Resistance of Asphalt Modified with Ce-Doped Bentonite

Bentonite and cerous ions were introduced to investigate their effect on the antiultraviolet aging of asphalt. In this paper, Ce-doped bentonite is obtained by mixing cerous nitrate with calcined activated bentonite. The Ce-doped bentonite and asphalt are mixed in high speed-shears to modify asphalt. Through the basic performance test and rheological properties test to study the ultraviolet (UV) aging properties of asphalt modified with Ce-doped bentonite. The results show that bentonite and cerous ions can improve the antiultraviolet aging performance of asphalt. In a certain range, the higher the cerous content, the better the modification effect. gel permeation chromatography, thermogravimetry analysis, and Fourier transform infrared spectroscopy tests analyze the changes in the microstructure of asphalt before and after modification. In addition, layered experiments are designed to prove that asphalt aging is affected by internal depth. After adding bentonite and cerous ions, the asphalt showed excellent UV resistance either on the surface or the interior. The work provides a feasible method for improving the ultraviolet aging resistance of asphalt and promoting rare-earth doped materials modified asphalt, which has a good prospect.