Abstract
The low-temperature cracking performance of asphalt is considered one of the main deteriorations in asphalt pavements. However, there have been few studies on the low-temperature cracking performance of asphalt under heat and light together. Hence, the ductility test, bending beam rheometer (BBR) test, and asphalt composition analysis test are combined to investigate the low-temperature cracking performance under heat and light together based on the climatic conditions of China. The styrene–butadiene–styrene block copolymer (SBS)-modified asphalt binders were prepared with different modifier types and base asphalt in this research. The results show that the low-temperature cracking resistance of asphalt reduces under heat and light together. It is obviously reduced at the early stage, and it becomes worse with the increase of the aging time, temperature, and ultraviolet (UV) intensity. The asphalt composition has a significant impact on its low-temperature cracking performance, and the SBS modifier can improve the low-temperature cracking resistance of asphalt. The rational selection of base asphalt and modifier can improve the low-temperature cracking performance of asphalt. Under heat and light together, whether base asphalt or modified asphalt, the change trends of their ductility and component content are similar. Therefore, to improve the anti-cracking ability of the asphalt pavement, it is suggested to use the ductility of asphalt aged by heat and light together for 15 days as the evaluation index of the low-temperature cracking performance of asphalt, and asphalt should be selected according to the temperature and UV intensity of the asphalt pavement use area.
Highlights
BackgroundAsphalt pavement cracking will cause the surface water to run into the pavement, which will cause many issues, such as loose, potholes, and stripping
As100 observed in Figure 5, the ductility value of asphalt decreased with the increase of aging time
Six kinds of asphalt were exposed under heat and light together for 5, 7, and 15 days to investigate the low-temperature cracking performance, and the following conclusions can be obtained
Summary
Asphalt pavement cracking will cause the surface water to run into the pavement, which will cause many issues, such as loose, potholes, and stripping. Lots of investigations have been performed for the cracking of asphalt pavement and asphalt mixture, research rarely focuses on the effect of heat and light together. The low-temperature performance and evaluation method of asphalt were implemented by several researchers [11,12,13,14,15], they didn’t consider the influence of light and heat together. Zhang et al investigated the effect of long-term laboratory aging on the rheological properties and cracking resistance of polymer-modified asphalt binders at intermediate and low-temperature ranges and analyzed different evaluation indexes [18]. To solve the problem of asphalt pavement cracking, it is necessary to investigate systematically the low-temperature cracking performance of asphalt under heat and light together based on the environmental conditions of asphalt pavement
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