ABSTRACT
In this paper, nano-TiO2 was loaded onto activated Al2O3 according to the reasonable proportions so as to prepare a haze-eliminating material, which could be applied on the pavement surface to efficiently eliminate haze by absorbing PM2.5 particles and purifying harmful ingredient in exhaust. Moreover, a novel test system which is composed of exhaust environmental cabinet, solar simulation lamps, surface simulation plate, PM2.5 detector and automobile exhaust detector was designed, and then a standard test method and some evaluation indexes were proposed to investigate the performances of haze-eliminating materials. It is found that the haze-eliminating efficiency reached the highest when the proportion of activated Al2O3 to nano-TiO2 was 2.75:1, and the purifying efficiency for NOx was up to 83%. Finally, the application feasibility of haze-eliminating material on the asphalt pavement surface was validated, and the surface functions were also tested. Test results showed that the haze-eliminating coating improved the impermeability of asphalt pavement, while reduced the anti-skid performance. However, the anti-skid performance of haze-eliminating coating could be ensured by adding a certain amount of carborundum.
