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Temperature dependency of VOCs release characteristics of asphalt materials under varying test conditions

Journal of Traffic and Transportation Engineering(English Edition) 2022年第2期9卷 280-292页

作者： Xiwen Chang Yue Xiao Yongshuang Long Feng Wang Zhanping You State Key Laboratory of Silicate Materials for Architectures Wuhan University of TechnologyWuhan 430070China Hubei Provincial Academy of Building Research and Design Co. LtdWuhan 430071China Department of Civil and Environmental Engineering Michigan Technological UniversityHoughtonMI 49931USA

Asphalt pavement is increasingly used in paving and ***,the release of volatile organic compounds(VOCs)from asphalt harm both the environment and *** methods were applied to characterize the VOCs for better understanding and ***,asphalt VOCs have huge heating temperature dependency,which makes the asphalt VOCs’characterization *** this research,three kinds of heating conditions,thermal gravimetric(TG)analyzer,pyrolysis(PY)analyzer,and thermal desorber(TD),were compared to determine the temperature dependency of VOC release *** chromatography and mass spectrometer(GC-MS)were then coupled for VOC *** indicated that the TG heating condition can surely simulate the volatilization of VOCs from some asphalt that is not in contact with air(no oxygen)during the actual construction process,while PY and TD represent the substances released by the asphalt due to the boiling point at a certain temperature and under the actual construction process,*** components detected by TG heating condition are both large and small molecules,while PY and TD heating condition will detect large molecules or small molecules,*** VOC composition results under various heating conditions reflect the chemical reaction law of asphalt molecules in the heating *** heating asphalt binders to a higher temperature,macromolecular substances will gradually crack and oxidize into small molecular substances,sulfides and *** the increase of temperature,the change trend of VOC components under different conditions is different.

关键词： Asphalt materials Volatile organic compounds thermal gravimetric analysis-mass spectrometer Pyrolysis-gas chromatography-mass spectrometer thermal desorption-gas chromatography-mass spectrometer

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