纳米TiO_2雾封层对汽车尾气降解效果评价

Effect Evaluation of Automobile Exhaust Decomposition by Using Fog Seal Containing Nano-TiO_2

为了研究纳米TiO_2掺加到封层材料并喷涂于沥青路面后对汽车尾气中NO、HC、CO气体的降解性能、降解耐久性以及对路表抗滑性的影响,基于室内模拟实验,将纳米TiO_2以封层方式喷涂到AC混合料表面,通过检测对有害气体的降解效果等方面开展相关研究,并且与水基涂覆方式进行对比评价.研究表明:在TiO_2掺加剂量均为2%(TiO_2与涂覆液的质量比)时,雾封层式降解效果比水基涂覆式低3.4%~32.1%,但耐久性远高于水基涂覆式,经过10 000次轮辙磨耗,水基涂覆式对三种有害气体的平均降解率相比磨耗前下降66%~73%,而雾封层式仅下降8%~17%.两种掺加方法都会使路表抗滑性有所降低,但仍在规范要求范围内.

In order to make analysis and evaluate the effect of decomposition on NO, HC and CO in automobile exhaust and the influence on pavement skid-resistant performance by using fog seal containing Nano-TiO2, Nano-TiO2 is blended with fog seal and coated on the surface of AC asphalt mixture to carry out the relative research about the decompostion effect and a comparative evaluation with water-coating containing Nano-TiO2 is made. The investigation results show that in the case of best dosage for Nano- TiO2 , the decomposition effect of fog seal containing Nano-TiO2 is less than 3.4% - 32.1% compared with water-coating containing Nano-TiO2. But the durability of fog seal containing Nano-TiO2 is far better than water-coating containing Nano-TiO2. After 10,000 wheel rut, the decomposition effect of water- coating containing Nano-TiO2 declines 66% -73% , and the decomposition effect of fog seal containing Nano-TiO2 declines only 8% - 17%. The skid resistant of asphalt pavement is reduced due to coating, no matter fog seal or water-coating, but it can still meet the technical requirement of relative specification for asphalt mixture.