Experimental Studies On Automobile Exhaust Photocatalytic Degradationly Asphalt Pavement Material

Automobile exhaust pollution has become a big problem, how to reduce it’s harm whileenjoying the convenience puzzled the environmental protection department. As the carrier ofmoving vehicle, the contaction with automobile exhaust directly. It is effective to reduce harmif road has the functiona of degrade automobile exhaust. The study on automobile exhaustphotocatalytic degradationly asphalt pavement is not systemic, and the equipment is simpleand crude, unscientific, and lack of demonstration in test methods and conditions. It is lack ofphysical meaning to describe the objective law of density loss in regression mathematicalmodel. There is no assessment indicator system of automobile exhaust photocatalyticdegradationly asphalt pavement. The study on the influence factor of photocatalyticperformance is not systemic, and there is not have a well-developed theories in the attenuationlaw of photocatalytic performance.Firstly the test system of photocatalytic performance to automobile exhaust wasresearched and development. The major components and functions were researched, and thebasic parameters were confirmed, include irradiance and gas concentration. Accumulativetotal resolution ratio model, testing time and calibrat formula was set up, and the operatinginstruction of test system of photocatalytic performance to automobile exhaust wasformulated. The form of automobile exhaust photocatalytic degradationly asphalt pavementwas divided into HMA automobile exhaust photocatalytic degradationly asphalt pavement,surface loaded automobile exhaust photocatalytic degradationly asphalt pavement, seal coatautomobile exhaust photocatalytic degradationly asphalt pavement. The evaluating index ofphotocatalytic performance and materials design index system of HMA and surface loadedautomobile exhaust photocatalytic degradationly asphalt pavement was set up. Mechanism ofautomobile exhaust photocatalytic degradationly asphalt pavement was analysed. Influencefactors of photocatalytic performance were analysed, and the photocatalytic performanceprediction models of HMA and surface loaded automobile exhaust photocatalyticdegradationly asphalt pavement was established. Both sides include photocatalytic andpavement performances were considered to the design of materials and structures. The relationship between with the attenuation law of photocatalytic performance and reactiontimes, washing times, pollution index, compaction effect was analysised and researched.The results show that, hole-electron pair is generated while TiO2receive theUV-irradiation, and then OH is generated which could resolve CO、NOx、HC to be CO2、H2O、 NO3-. The photocatalytic performance prediction model of HMA automobile exhaustphotocatalytic degradationly asphalt pavement according to TiO2mixing amount, voidfraction, irradiance and temperature, and The photocatalytic performance prediction model ofsurface loaded automobile exhaust photocatalytic degradationly asphalt pavement accordingto TiO2mixing amount, load quality, irradiance and temperature had high accuracy. HMAautomobile exhaust photocatalytic degradationly asphalt pavement with excellentphotocatalytic and road performance could be prepared by PAC-13,2.75%anatase TiO2, highviscosity asphalt with12%TPS. Surface loaded automobile exhaust photocatalyticdegradationly asphalt pavement with excellent photocatalytic and road performance could beprepared by7.7%anatase25nm TiO2,(NaPO3)6, HCl, emulgator, NH4CL, Cacl2, SBS.Reaction times, pollution index and compaction effect have the interrelate with attenuationlaw of photocatalytic performance, There is not a strong link washing times and attenuationlaw of photocatalytic performance.