Zhou Peilei, Wang Wensheng, Zhu Lili, Wang Haoyun, Ai Yongming
College of Transportation, Jilin University, Changchun 130025, China.
College of Construction Engineering, Jilin University, Changchun 130025, China.
Materials (Basel). 2021 Jun 4;14(11):3089. doi: 10.3390/ma14113089.
This study aims to investigate the performance evolution and mechanism of asphalt under action of chloride salt erosion. Asphalt samples soaked with five different snow melting chloride salt concentrations were taken as the research object. Then, the high-temperature performance, low-temperature performance, temperature sensitivity and asphalt-aggregate adhesion property of asphalt samples were carried out. Additionally, Fourier transform infrared spectroscopy (FTIR) was used to explore the mechanism of chloride salt erosion on asphalt. Test results showed the linear variation relationships of high-temperature performance, low-temperature performance and temperature sensitivity with chloride salt concentrations. The high-temperature performance of asphalt would be improved by chloride snowmelt salt. With the increase in the chloride salt solution concentration, the low-temperature performance of asphalt became worse, and the temperature sensitivity increased. Moreover, after the effect of the chloride salt solution, the asphalt-aggregate adhesion property decreased with the increase in the chloride salt solution concentration. It is necessary to control the amount of chloride snowmelt salt in the actual snow removal projects. Finally, based on Fourier transform infrared spectroscopy, the mechanism of chloride salt erosion on asphalt was preliminarily explored. With the increase in the chloride salt solution concentration, the proportion of light components (saturated fraction, aromatic fraction) in asphalt decreased, and the proportion of heavy components (resin and asphaltene) with good thermal stability increased.
本研究旨在探究氯化物盐侵蚀作用下沥青的性能演变及机理。选取用五种不同融雪氯化物盐浓度浸泡的沥青样品作为研究对象。然后，对沥青样品的高温性能、低温性能、温度敏感性和沥青-集料粘附性能进行了测试。此外，采用傅里叶变换红外光谱（FTIR）探究氯化物盐对沥青的侵蚀机理。试验结果表明高温性能、低温性能和温度敏感性与氯化物盐浓度呈线性变化关系。氯化物融雪盐会改善沥青的高温性能。随着氯化物盐溶液浓度的增加，沥青的低温性能变差，温度敏感性增加。而且，在氯化物盐溶液作用后，沥青-集料粘附性能随氯化物盐溶液浓度的增加而降低。在实际除雪工程中，有必要控制氯化物融雪盐的用量。最后，基于傅里叶变换红外光谱，初步探究了氯化物盐对沥青的侵蚀机理。随着氯化物盐溶液浓度的增加，沥青中轻质组分（饱和馏分、芳香馏分）的比例降低，热稳定性良好的重组分（树脂和沥青质）的比例增加。
