TiO2-Modified Emulsified Asphalt Exhibits Enhanced High-Temperature Performance and Photocatalytic Functionality

This study developed a nano-TiO2 modified emulsified asphalt, and the effects of varying dosages of nano-TiO2 on the performance of emulsified asphalt were systematically investigated. The photocatalytic performance of nano-TiO2 modified emulsified asphalt was evaluated through NOx degradation assessment using a self-developed device. Results showed that after adding nano-TiO2, the high-temperature stability and aging resistance of the modified emulsified asphalt had improved. Specifically, when the TiO2 content ranged from 4% to 6%, the surface temperature of the photocatalytic fog seal layer decreased by 2.0 °C. At 4% TiO2 content, the cumulative degradation efficiencies of NO and NO2 reached 50% and 70%, respectively. When the fog seal layer spraying amount was set at 300 g/m2, the pavement performance met the required standards. Overall, nano-TiO2 photocatalytic materials simultaneously enhance the physical properties of asphalt and its environmental benefits, providing a promising solution for the development of multifunctional pavement materials.