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Sci Total Environ

Title:		Effect of heating history on the emission of volatile organic compounds from asphalt materials
Author(s):		Wang G; Yang X; Yang D; Rong H; Meng Y; Liu G;
Address:		"School of civil engineering and architecture, Guangxi University, Nanning 530004, China. School of civil engineering and architecture, Guangxi University, Nanning 530004, China. Electronic address: xiaolongyang@gxu.edu.cn"
Journal Title:		Sci Total Environ
Year:		2023
Volume:		20230725
Issue:
Page Number:		165692 -
DOI:		10.1016/j.scitotenv.2023.165692
ISSN/ISBN:		1879-1026 (Electronic) 0048-9697 (Linking)
Abstract:		"Asphalt binders release hazardous fumes during high-temperature heating that severely endanger human health and pollute the environment. In this study, a volatile organic compound (VOC) generation and detection device comprising a portable VOC detector was developed, and two heating modes (intermittent and continuous heating) were established to explore the influence of heating history on the VOC emission behavior of five asphalt samples. The changes in the VOC species and content, as determined by the heating history, were analyzed via gas chromatography-mass spectrometry (GC-MS). Finally, the key factors affecting the emission of VOCs from asphalt are discussed based on the four components of asphalt materials. The results indicated that the emission of VOCs from asphalt materials under intermittent heating conditions decreased significantly with increasing heating history (significantly fewer VOCs, including 13 common components such as alkanes, benzenes, and hydrocarbon derivatives, were emitted under this condition than under continuous heating conditions at the same temperature point). Compared with continuous heating, intermittent heating is more conducive for studying asphalt VOCs. Under intermittent heating, different asphalt materials exhibited similar VOC emission curves; the VOCs were mainly emitted during the first two heating stages (200 and 180 degrees C, respectively). Thus, it can be deduced that asphalt VOC emissions were induced by the synchronized actions of the four components of asphalt materials. Therefore, different components can contribute to the emission of several VOCs of the same composition. The heavy and light components mainly facilitate the emission of common components with carbon atomic numbers <18 and > 18, respectively"
Keywords:		Asphalt binder Gc-ms Heating history Road engineering Voc;
Notes:		"PubMed-not-MEDLINEWang, Guangchen Yang, Xiaolong Yang, Deyu Rong, Hongliu Meng, Yongjun Liu, Guiyong eng Netherlands 2023/07/28 Sci Total Environ. 2023 Nov 20; 900:165692. doi: 10.1016/j.scitotenv.2023.165692. Epub 2023 Jul 25"