Abstract
Functional pavement material with exhaust-purifying performance has been focused gradually 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 agent in emulsified asphalt evaporation residue was analyzed and discussed through using SEM and FTIR. Finally, the purifying effect of micro surfacing on exhaust was examined in laboratory to investigate the impact of various experimental conditions on purifying performance. Meanwhile, the purifying performance was also monitored in field test. The results showed that 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 better purifying effect on NOx and COx than traditional micro surfacing with TiO2. These environmental-friendly pavement materials would provide new solutions for the reduction in polluting emissions of automobile exhausts.
Highlights
Road traffic an integral part of the existing transportation system
The purifying effects of micro surfacing on nitrogen oxides (NOx) and COx were investigated in laboratory and field tests
With the addition of pyrite and specularite, the PTD and STD micro surfacing had noticeable purification effects on NOx and COx, while the TD micro surfacing was only effective for the degradation of NOx
Summary
Road traffic an integral part of the existing transportation system. In 2019, the number of automobiles around the world had almost exceeded 1.39 billion. Even though various innovative solutions have been found and applied in the automobile industry, the share of internal combustion engine vehicles (including hybrid vehicles) will remain prevalent for the several decades (Wei et al, 2009; Miyamoto et al, 2012; Hirata, 2014), and the exhaust emissions will be one of the main atmospheric pollution sources (Rêgo et al, 2014). Due to incomplete combustion of hydrocarbon fuel in internal combustion engines, automobile exhausts including carbon monoxide (CO), hydrocarbons (HC), nitrogen oxides (NOx), sulfur dioxides (SO2), particulate matter (such as lead compounds, carbon black particles, or oil mist, etc.), and other atmospheric pollutants damage the natural environment, and result in the haze pollution and urban heat island (UHI) effect (Çay et al, 2013; Fattah et al, 2013; Pinzi et al, 2013; Labarraque et al, 2015; Peng et al, 2015). The control of automobile exhausts is vital to protecting the environment and human health from air pollution
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