摘要
从提高光催化材料性能出发,以锐钛型纳米TiO2作为光催化材料应用在沥青路面中。采用A(将纳米TiO2均匀分散在沥青中,以沥青为载体)和B(将纳米TiO2与矿粉均匀混合,以矿粉为载体)两种掺加方式将5%的纳米TiO2掺入到沥青混合料中,成型OGFC—10车辙板试件进行试验,确定最佳的掺加方式。研究不同掺量、光照强度对纳米TiO2光催化性能的影响,并对其路用性能进行试验分析。结果表明:相比B方式,A方式下成型的试件其光催化降解汽车尾气的效果更好,故选定A方式为纳米TiO2的后续试验研究的掺加方式;随着纳米TiO2掺量的不断增加,试件对HC、CO和NO三种尾气成分的降解效果越来越好,从综合降解效果和经济性考虑,选定5%为最佳掺量;纳米TiO2对尾气的降解效果随光照强度的增强越来越好;混合料的各项路用性能随着纳米TiO2的掺入而变得更好,所以实际工程应用中不必考虑其对混合料路用性能的不利影响。
Starting from the improvement of the performance of the photocatalytic material, the anatasenano-TiO2 was used as the photocatalytic material in the asphalt pavement. The 5% of nano-TiO2 wasmixed into the asphalt mixture by two kinds of ways called A（the nano-TiO2 was well dispersed in as-phalt, and the asphalt was the carrier） and B（the nano-TiO2 and powder were evenly mixed, and the pow-der was the carrier） to form the specimen of OGFC-10 rut board and test it, in order to confirm the bestway of mixing. The influence of different dosage and light intensity on the photocatalysis performance ofnano-TiO2 was studied, and its pavement performance was tested. The results show that： comparing withthe method B, the specimen formed by method A has better effect on photocatalytic degradation of auto-mobile tail gas, so method A is selected as the mixing mode in subsequent tests; along with the increaseof the content of nano-TiO2, the degradation effect of three kinds of automobile tail gas（HC, CO, NO） arebecoming better and better; considering the degradation effect and the economic benefit, 5% is selected as the best dosage of nano-TiO2; the degradation effect of nano-TiO2 on the tail gas are getting betterwith the increase of the intensity of illumination; all the indexes of pavement performance are getting bet-ter with the mixing of nano-TiO2, therefore it is not necessary to consider the influence of nano-TiO2 onthe pavement performance of mixture in the practical engineering application.
出处
《交通运输研究》
2015年第5期75-81,共7页
Transport Research
基金
国家自然科学基金项目(51478052)
