AUTHOR=Sun Xiaolong , Liu Zhisheng , Qin Xiao , Zeng Dongfang , Yin Yingmei TITLE=Purifying Effect Evaluation of Pavement Surfacing Materials Modified by Novel Modifying Agent JOURNAL=Frontiers in Materials VOLUME=7 YEAR=2020 URL=https://www.frontiersin.org/journals/materials/articles/10.3389/fmats.2020.00180 DOI=10.3389/fmats.2020.00180 ISSN=2296-8016 ABSTRACT=

Functional pavement material with an exhaust-purifying performance has gradually become of greater interest to researchers in recent years. For improving the purifying effect of functional micro surfacing, two types of raw ore powders with exhaust-purifying potentials were selected as novel functional modifiers. Firstly, the road performance of purifying micro surfacing was evaluated according to the ASTM and ISSA standards. Then, the dispersion state of modifying agents in emulsified asphalt evaporation residue was analyzed and discussed using SEM and FTIR. Finally, the purifying effect of micro surfacing on exhausts was examined in a laboratory to investigate the impact of various experimental conditions on the purifying performance. Meanwhile, the purifying performance was also monitored in a field test. The results showed that the road performance of purifying micro surfacing could fulfill the requirements of relevant technical standards. Pyrite had better dispersion property than specularite and titanium dioxide inside asphalt. The purifying micro surfacing could achieve a better purifying effect on NOx and COx than traditional micro surfacing with TiO2. These environmentally friendly pavement materials could provide new solutions for the reduction of polluting emissions in automobile exhausts.