Abstract
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.
Highlights
Asphalt pavement has good skid resistance, low noise and excellent friction resistance, which has been applied as the main structure of expressway pavement in China [1,2,3].asphalt pavement is prone to high temperature rutting, low temperature cracking, water damage and spalling [4,5,6,7,8,9,10]
Considering the problem that the existence of salt would bring continuous negative effects to asphalt pavement, this study aims at analyzing the performance evolution and mechanism of asphalt under action of chloride salt erosion
The asphalt–aggregate adhesion property is evaluated, and the mechanism of chloride salt erosion on asphalt is preliminarily explored by Fourier transform infrared spectroscopy (FTIR)
Summary
Asphalt pavement is prone to high temperature rutting, low temperature cracking, water damage and spalling [4,5,6,7,8,9,10]. In some special natural environments, especially in coastal areas and northwest saline soil areas, corrosion medium such as sulfate–chloride would lead to the serious damage of asphalt pavement after several years of service, and the service life of the road is greatly reduced [11,12,13,14,15]. The self-snow-melting pavement, which has achieved certain development, can directly solve the problem by adding snow melting and ice suppression materials [18,19]. The existence of salt will bring continuous negative effects to asphalt pavement
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