Abstract
Three novel asphalt modifiers with pollutant emission reduction effects and new emissions measurement equipment compatible with several preexisting asphalt production systems are developed in this paper. The effects of various modifier, asphalt binder type, and gradation of hot mix asphalt (HMA) on pollutant emissions are evaluated in the lab through a comprehensive experimental design. Furthermore, road performances are monitored to evaluate the emissions reduction of modified HMA mixture for production. With increasing modifier content, the emissions reduction performance is improved markedly, with maximum reduction of 70.5%. However, the impact of modifier content on pollutant emissions reduction tends to be insignificant for dosages greater than 20% of the initial asphalt weight. Changes in asphalt type and asphalt mix gradation are found to moderately impact the emissions reduction effect. Finally, the mechanisms of emissions reduction are investigated, primarily attribute to their physical and chemical adsorption and pollutant reductive degradation characteristics.
Highlights
With the rapid development of civil infrastructure systems, industry, manufacturing, and many other sectors, environmental pollution has become one of the most serious problems in the world
Many existing studies have focused on reducing carbon emission during the application of Hot mix asphalt (HMA) mixtures, including the use of warm mix asphalt (WMA), semiwarm mix asphalt (SWMA), and cold mix asphalt (CMA)
The WEAM, WES, and WEP modifiers are used in this test
Summary
With the rapid development of civil infrastructure systems, industry, manufacturing, and many other sectors, environmental pollution has become one of the most serious problems in the world. Hot mix asphalt (HMA) is widely employed in the construction of road pavements due to its advantages during construction and field operation. HMA tends to emit large amounts of pollutant gases during both production and construction because of the high temperatures involved in these processes. These emissions pollute the air and exacerbate the greenhouse effect but are harmful to the health of production and construction workers. This violates the established targets for energy conservation and emission reduction [1,2,3]. Many existing studies have focused on reducing carbon emission during the application of HMA mixtures, including the use of warm mix asphalt (WMA), semiwarm mix asphalt (SWMA), and cold mix asphalt (CMA)
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