Abstract
In order to clarify the influence of acid rain on semi-flexible pavement, in order to explore the damage evolution characteristics of acid rain on semi-flexible pavement, in order to explore the mechanism of acid rain on the damage evolution of semi-flexible pavement. In this paper, sulfuric acid acid rain, nitric acid rain and mixed acid rain were prepared respectively. The water stability of semi-flexible pavement under different types of acid rain corrosion was evaluated by immersion Marshall test and vacuum saturation test. The surface morphology and transmittance of semi-flexible specimens were characterized and described by means of ultrasonic non-destructive testing, scanning electron microscopy, infrared spectroscopy and atomic force microscopy. The mechanism of damage evolution of water stability of semi-flexible pavement under different types of acid rain corrosion was revealed from the micro level, and the damage evolution equation of water stability of semi-flexible pavement under different types of acid rain corrosion was obtained. At the same time, the mechanism of damage evolution of water stability of semi-flexible pavement under different types of acid rain corrosion is revealed from the molecular level by molecular dynamics theory. The results show that sulfuric acid rain has the greatest influence on the damage evolution of water stability of semi-flexible pavement, followed by mixed acid rain, and nitric acid rain has the least influence on the damage evolution of water stability of semi-flexible pavement.
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