The Main Components and Emission Characteristics of Environmentally Hazardous Substances from Road Asphalt

Road asphalt produces hazardous substances under high temperatures, which polluted the environment and endangered human health. To clarify the emission characteristics of asphalt hazardous substances (AHS), the main components of AHS were comprehensively investigated and summarized. The emission characteristics of AHS under different testing conditions were systematically studied. The regression models between AHS emissions and various variables were established. The results show that the main components of AHS mainly include volatile organic compounds, inorganic small molecule gases, and suspended particles. AHS emissions and emission rates increase with the increase in heating temperatures. AHS emissions and the heating temperatures conform to the power function relationship. AHS emissions decrease with heating times increasing, while the cumulative emissions show the opposite trend. AHS and heating times conform to the exponential function relationship. AHS emissions increase with the increase of asphalt qualities. The increased multiples of AHS emissions and asphalt qualities conform to the linear functional relationship. AHS emissions from rubber powder-modified asphalt are the highest compared to other commonly used road asphalt