Research On The Degradation Of Automobile Exhaust And Mitigation Of Urban Heat Island Effect Of Bituminous Mixture

At present, air pollution and urban heat island effect is main problems with city environment, one ofthe main reasons for these problems is the city underlying surface is mainly composed of asphalt pavementand vehicle exhaust.Therefore, the pavement degradation of exhaust gas and cooling technology forpromote new pavement materials technology development and improvement of residents livingenvironment have great significance.In this paper, studies the blending with photocatalytic degradation of automobile exhaust performanceof bituminous mixture, and ease the heat island effect type mixture design and performance were studied.comprehensive analysis reduce urban air pollution and ease the urban heat island effect two aspects,considering the influence of technology integration and interaction, to develop new automobile tail gasdegradation and reduce the urban road pavement temperature multi-function bituminous mixture.Puts forward the structure of the vehicle exhaust test system conditions, and develop the road vehiclesimulation and testing system. Vehicle exhaust test system supplied by automobile exhaust device,decomposition reaction device, gas concentration of real-time testing device and accessory connection parts.Study the system composed of device function, structure and parameter; Establishment of test method fordegradation of exhaust test system, and establish the model of automobile exhaust natural attenuation inreaction device, to evaluate the decay law of exhaust gas in the reaction. Based on the analysis of theexisting evaluation index, put forward the system of evaluation index system of degradation of tail gas.Research and determine the illumination intensity, exhaust gas concentration, such as test temperature andtest time of the testing system.Basic conditions of photocatalytic applied in road can be proposed, and primary determination ofnano ferric oxide and nano titanium dioxide as backup photocatalyst material. Through the degradation ofautomobile exhaust performance and the influence of the asphalt performance study, optimization todetermine titanium dioxide as the best photocatalytic materials. Particle size and crystal structure oftitanium dioxide light catalyst, such as how much content to study the technical requirements. Study on thetechnique requirements of titanium dioxide photocatalyst particle size, crystal structure and titaniumdioxide content. To study the factors of blending mode, temperature, light intensity, concentration ofexhaust gas, mixture type and porosity effects of photocatalyst degradation of tail gas mixture performance;Evaluation of photocatalytic effect on the performance of asphalt mortar and mixture road performance. Establish the thermal resistance of asphalt mixture temperature and thermal physical propertyparameters test method. Optimization of shale ceramsite as thermal resistance aggregate, and mixproportion design of thermal asphalt mixture by volume mixing scheme. Study on the changes of thermalresistance aggregate content for the properties influence of mixture Marshall index and road performance;through indoor and outdoor test to evaluate the mixture temperature cooling effect. Analysis the thermalphysical properties and cooling mechanism of heat resistance asphalt mixture. Integrated cooling andperformance results, recommend the best volume ceramsite content is40%.With degradation of automobile exhaust and ease the heat-island effect function to integrate design ofasphalt mixture, and to mix degradation exhaust performance, reducing road surface temperature and roadperformance make a comprehensive evaluation. Developed new asphalt mixture with degradation ofautomobile exhaust and mitigation of urban heat island effect.