Dept. of Civil & Environment Engineering, Hong Kong Polytechnic University, Hong Kong, China.
Dept. of Civil & Environment Engineering, Hong Kong Polytechnic University, Hong Kong, China.
J Hazard Mater. 2019 Jun 5;371:342-351. doi: 10.1016/j.jhazmat.2019.03.025. Epub 2019 Mar 6.
Asphalt fumes generated in pavement construction have been extensively studied from the perspective of occupational health. In this paper, they are examined from the perspective of material and construction. Asphalt binders from different sources were used to create standard mixtures. An asphalt fume generation and collection system was designed and built for generating fumes at simulated construction conditions and collecting fumes similar to the procedure used in field exposure studies. Total particulates (TP) in the fume samples were analyzed gravimetrically, and the chemical components of the samples were identified by using GC/MS. Results indicate that the TP concentration and chemical component of asphalt fumes are dependent on asphalt source and temperature. The concentration from one asphalt can be several times higher than that from another. With a temperature rise in 20 °C, the concentration increases about 3-7 times. At 140 °C, the total number of detected PAHs ranges from 4 to 9; at 160 °C, the number ranges from 4 to 12. The hazardous potentials of asphalt fumes vary with asphalt source and mixing temperature. Therefore, standardized laboratory test procedures are needed for risk assessment, based on which proper material selection and construction strategies may be chosen for hazard mitigation.
在路面施工过程中产生的沥青烟雾已从职业健康的角度进行了广泛的研究。本文从材料和施工的角度对其进行了研究。使用来自不同来源的沥青粘合剂来制作标准混合物。设计并建造了一个沥青烟雾产生和收集系统，以在模拟施工条件下产生烟雾，并按照现场暴露研究中使用的程序收集烟雾。使用重量分析法分析了烟雾样品中的总颗粒物（TP），并使用 GC/MS 鉴定了样品的化学成分。结果表明，沥青烟雾的 TP 浓度和化学成分取决于沥青来源和温度。一种沥青产生的浓度可能是另一种的数倍。温度升高 20°C 时，浓度增加约 3-7 倍。在 140°C 时，检测到的多环芳烃总数范围为 4 至 9；在 160°C 时，数量范围为 4 至 12。沥青烟雾的危害性因沥青来源和混合温度而异。因此，需要基于标准化实验室测试程序进行风险评估，根据该程序可以选择适当的材料选择和施工策略来减轻危害。
