Study on Odor-Reducing Effectiveness and Performance Impacts of Deodorizing Materials on Asphalt Binders

Asphalt binder flue gas emits irritating odors and poses health and environmental hazards. To promote the sustainable development of asphalt pavement construction, this study investigates the flue gas odor-reducing effectiveness and performance impacts of deodorizing materials on asphalt binders. A specialized asphalt binder flue gas collection device was designed, coupled with an evaluation protocol tailored for asphalt deodorants, to systematically evaluate the odor-reducing effectiveness of materials B and C on both 70# pure asphalt binder and SBS-modified asphalt binder. Finally, the impacts of two kinds of deodorizing materials on the high-temperature and low-temperature performance of different asphalt binders were discussed. The results show that the odor-reducing effectiveness of tert-butyl-co-aldehyde-acting material C on odorous volatile organic compounds (VOCs), hydrogen sulfide (H2S), and carbon monoxide (CO) in 70# pure asphalt binder flue gas is the best, reaching 66.7%, 49.1%, and 44.0%, respectively. The odor-reducing effectiveness of conjugated double bonds and aldehyde group synergistic material B on odorous VOCs, H2S, and CO in SBS-modified asphalt binder is the best, reaching 78.7%, 52.9%, and 51.0%, respectively. Both materials B and C can improve the high-temperature deformation resistance of 70# pure asphalt binder and SBS-modified asphalt binder. The anti-cracking properties of SBS-modified asphalt binder at low temperatures were improved to some extent by materials B and C, but the anti-cracking properties of 70# pure asphalt binder at low temperatures were not good. These asphalt binders all meet the specification requirements of a stiffness modulus not more than 300 MPa and a creep rate not less than 0.3.