Abstract: Based on the application concept of nano-materials,two kinds of petroleum asphalt were modified by nano-titanium dioxide (TiO2) powder.The modified asphalt was evaluated by conventional road testing method,short-term thermal aging (TFO),ultraviolet aging method and rheological testing method.Nano-TiO2 modified asphalt-70 and nano-TiO2 modified asphalt-90 were prepared by using nano-TiO2 as modifier and 70 and 90 asphalt as base asphalt.When the content of nano-TiO2 was 3.5% (mass fraction),the penetration of asphalt-70 and asphalt-90 were 60.0/0.1mm and 79.0/0.1mm respectively,the softening point were 48.1℃ and 45.7℃ respectively,the viscosity at 60℃ were 362Pa·s and 208Pa·s respectively,and the fatigue time reached 620s and 672s respectively after 5h of ultraviolet aging.According to the conventional index of pavement performance,the effect of nano-TiO2 modification was much more outstanding than that of ordinary mineral powder filler,and it can improve the fatigue resistance and heat aging resistance of asphalt,and improved the anti-ultraviolet aging ability of asphalt.But compared with polymer modified asphalt,nano-TiO2 had a limited improvement in high temperature performance of asphalt,and had a negative impact on the ductility of modified asphalt.
樊亮, 裴金荣, 李永振. 纳米TiO2改性沥青的路用性能与抗老化效果研究[J]. 化工新型材料, 2019, 47(7): 257-261.
Fan Liang, Pei Jinrong, Li Yongzhen. Stody on road performance and anti-aging effect of nano TiO2 modified asphalt. New Chemical Materials, 2019, 47(7): 257-261.