Experimental Study On Environmental Protection Asphalt Pavement Materials With Degradable Automobile Exhaust And Low Dust Production

With the improvement of China’s national economy,automobile ownership remain continuously rapid growing.By the end of 2017,the number of motor vehicles in China has reached 310 million.The automobile provides convenience for people,whilst the exhaust of automobile exhaust,tires and road surface also brings serious environmental pollution.In this paper,the nano-Ti O2 photocatalyst material is used as a solution for degrading automobile exhaust gas.Considering the characteristics of large surface area,wide distribution,direct action of tire and tail gas,the nano-Ti O2 photocatalyst material is applied to asphalt-based materials by sand-containing sealing method.Under the premise of ensuring the road performance of asphalt pavement,the pavement has the function of degrading automobile exhaust and reducing the amount of dust generated by tire and pavement friction.The preparation of environmentally-friendly functional asphalt pavement materials is of great research significance.Based on the characteristics of functional pavement material exhaust gas degradation test,an indoor test equipment for degradable automobile exhaust gas was developed,which can meet the experimental requirements of sensor accuracy,ultraviolet light transmission,air tightness and material size.The dispersion stability of photocatalytic materials in coated carrier materials was studied.According to the characteristics of emulsified asphalt in coated carrier,the appropriate dispersant was selected and the optimum proportion was determined based on orthogonal test.The degradation rate and degradation rate were used to comprehensively evaluate the degradation effects of different addition processes and dosages.The results show that the use of sand-containing seal layer can effectively degrade NO2 in automobile exhaust gas,and the degradation amount reaches 33%.The wheel rolling effect has no effect on the degradation effect and the material has good durability.The photocatalytic effects of different ultraviolet light sources were tested.The results demonstrate that there is no obvious relationship with the type of light source.The characteristic light wavelength is a necessary condition for photocatalytic degradation of tail gas and the experimental study on the environmentally-friendly fog seal layer containing nano-Ti O2 was carried out by using the ruthenium.The results show the water stability has an increasing trend with the increase of the amount of nano-Ti O2,and it do not crushed after 20,000 times under the condition of 5%.The peeling stage occurs and the material has good water stability.The dust emission was studied by the accelerated loading test.The results indicate that the gradation and material composition of the pavement material have significantly influence the amount of dust consumed by the tire,and with the increase of the void ratio the dust amount decreased.The sand-containing seal layer can effectively reduce the amount of dust generated by friction between the tire and the road surface.