【摘要】 高寒区面层材料长期受到大温差循环作用的影响，极易发生破坏。且由于沥青材料是温度敏感性材料，材料性能是会随温度变化及循环的累加发生变化，实际性能常常和预期不符，这种性能变化会进一步加剧面层材料的损坏风险。该研究主要对四种低温温度循环条件的AC-16集配SBS沥青混合料进行不同次数的循环作用，对比不同温度循环条件下的抗压强度、弹性模量以及抗弯拉疲劳性能，分析研究循环作用中性能的变化趋势及原因。结果表明，材料的力学性能、抗疲劳性能都经受循环次数的增加呈现下降的趋势；几种温度循环工况对试件性能的影响程度为：冻融循环>高寒区温度循环>>小温差温度循环。在长期零下温度的冰冻循环过程中，温差增大会导致材料力学性能明显下降和抗疲劳性能损耗程度明显增加，随着高寒区大温差冰冻循环增加，沥青混合料的玻璃态转变温度逐渐降低，高寒区大温差地区的温差循环作用导致的面层材料性能衰减较为明显。更多还原

【Abstract】 In high-cold regions, surface layer materials are prone to damage due to long-term exposure to large temperature difference cycles. Moreover, as asphalt materials are temperature-sensitive, their properties change with temperature variations and the accumulation of cycles, resulting in actual performance often inconsistent with expectations. Such property changes will further exacerbate the risk of damage to surface layer materials. This study mainly subjects AC-16 graded SBS asphalt mixtures to cycles of different times under four low-temperature cycling conditions, compares the compressive strength, modulus, and flexural-tensile fatigue performance under diff erent temperature cycling conditions, and analyzes the variation trends and causes of performance during the cycling process. The results show that the mechanical properties and fatigue resistance of the materials show a decreasing trend with the increase in the number of cycles; the degrees of influence of several temperature cycling conditions on the performance of the specimens are as follows: freeze-thaw cycles > temperature cycles in high-cold regions >> small temperature difference cycles. In the process of long-term freezing cycles at sub-zero temperatures, the increase in temperature difference will lead to a significant decrease in the mechanical properties of the materials and a significant increase in the degree of loss in fatigue resistance. With the increase of large temperature difference freezing cycles in high-cold regions, the glass transition temperature of asphalt mixtures gradually decreases. The performance attenuation of surface layer materials caused by temperature difference cycles in high-cold regions with large temperature diff erences is relatively obvious.更多还原