Quantitative Characteristics of Gaseous Inorganic Compounds in Asphalt Fume with Combustion Condition

Abstract

The mitigation of asphalt fume is widely concerned in recent years. Numbers of studies have investigated the characteristics of asphalt Volatile Inorganic Compounds (VOCs) and ignoring the negative effects by gaseous inorganic compounds (GICs), which hinders the implementation of air pollution controlling for asphalt pavement. The study used the thermogravimetric analyzer (TG) interpreted the thermodynamic properties of base and modified asphalt binders, and the releasing amounts and concentrations of GICs were quantified by fume analyzer. Meanwhile, the environmental impacts of GICs from 4 kinds of asphalt have been quantified and interpreted. The results showed that the modified asphalt behaved better thermal stability than base asphalt according to the TG-DTG and enthalpy analysis. Considering 1 gram of asphalt sample, the base asphalt could release extra 8 mg of GICs than modified asphalt, additionally, the emissions of NO2, NO, CO2, and SO2 are all less than the mass of 1 mg. For the environmental effects, the releasing GICs had the greatest impacts on human toxicity due to the intensive CO emission. These results are expected to provide reference and new insights into the improvement of asphalt fumes mitigation.

Keywords: asphalt fume, gaseous inorganic compounds, rubber modified asphalt, SBS modified asphalt, Environmental impacts