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Emission Risk and Inhibition Technology of Asphalt Fume from Crumb Rubber Modified Asphalt

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  • Zipeng Wang

    (Key Laboratory of Road and Traffic Engineering of the Ministry of Education, Tongji University, Shanghai 201804, China
    Hebei Transportation Investment Group Company Limited, Shijiazhuang 050019, China
    Hebei Tonghua Highway Materials Co., Ltd., Shijiazhuang 050019, China)

  • Hui Li

    (Key Laboratory of Road and Traffic Engineering of the Ministry of Education, Tongji University, Shanghai 201804, China)

  • Ming Jia

    (Key Laboratory of Road and Traffic Engineering of the Ministry of Education, Tongji University, Shanghai 201804, China
    Urban Mobility Institute, College of Transportation Engineering, Tongji University, Shanghai 201804, China)

  • Qunle Du

    (Hebei Transportation Investment Group Company Limited, Shijiazhuang 050019, China)

Abstract

Crumb rubber-modified asphalt mixtures have been proven to have extensive utilization value in road engineering. However, the rubber releases more fumes during the construction period, which causes severe harm to human health and the environment. This research focused on the emission risk of asphalt fume from crumb rubber-modified asphalt, and then the inhibition technology was also optimized. Firstly, the emission behavior and the hazardous evaluation of the asphalt fume from crumb rubber-modified asphalt were investigated. Then, the characteristics of the inhibition materials were evaluated. Finally, the reduction in the emission of inhibited crumb rubber-modified asphalt fume was identified, and the optimized formula was determined based on the inhibition effect, rheological properties, and cost. The results indicate that crumb rubber-modified asphalts release more fume components with an increment in the temperature and crumb rubber content. Desulfurized rubber reduces the release of H 2 S and NO. Benzene compounds, including paraxylene, toluene, and benzene, are the most released pollutants that harm human health, especially DS CRA 20% and CRA 50%. Kaolin powder and expanded graphite have a sufficient pore structure and volume, the addition of which reduces the release of pollutants while possibly promoting the release of NO and H 2 S. Their addition also has a significant control effect on the release of particulate matter at 170 °C and 185 °C. With the consideration of emissions, rheological properties, and cost, CRA 40%-EG2%-KL2% was determined as the optimization formula. This research is helpful to the application of crumb rubber-modified asphalt in road construction and maintenance.

Suggested Citation

  • Zipeng Wang & Hui Li & Ming Jia & Qunle Du, 2024. "Emission Risk and Inhibition Technology of Asphalt Fume from Crumb Rubber Modified Asphalt," Sustainability, MDPI, vol. 16(20), pages 1-19, October.
    • Handle: RePEc:gam:jsusta:v:16:y:2024:i:20:p:8840-:d:1497257
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    References listed on IDEAS

    as
    1. Zipeng Wang & Zenggang Zhao & Chao Yang & Xinkui Yang & Shuaichao Chen & Yingxue Zou, 2022. "Performance Evaluation of Asphalt Modified with Steel Slag Powder and Waste Tire Rubber Compounds," Sustainability, MDPI, vol. 14(14), pages 1-16, July.
    2. Bo Gao & Yuechao Zhao & Zenggang Zhao, 2023. "Characteristics of Polyurethane/Waste Rubber Powder Composite Modifier and Its Effect on the Performance of Asphalt Mixture," Sustainability, MDPI, vol. 15(17), pages 1-13, August.
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