间歇式紫外光老化对沥青性能的影响

Effect of Light-Dark Alternating UV Aging Condition on Asphalt Performance

摘要:

为探究自然环境中昼夜交替对沥青老化的影响，设计了间歇式紫外光老化试验，利用动态剪切流变仪、弯曲梁流变仪及原子力显微镜对间歇式紫外光老化沥青的流变性能进行了研究.结果表明：与持续式紫外光老化相比，间歇式紫外光老化对沥青流变性能影响更显著，经间歇式紫外光老化后沥青的高低温流变性能劣化更严重，中温条件下流动性更差，温度敏感性更低；相同深度下，沥青蜂状结构数量和蜂状结构总面积更少，老化物质在沥青内部扩散更充分，老化程度更大.

Abstract:

To investigate the effects of diurnal alternation in natural environments on asphalt aging， a light-dark alternating ultraviolet（UV） aging test was designed. The rheological properties of asphalt subjected to light-dark alternating UV aging were explored using dynamic shear rheometer， bending beam rheometer， and atomic force microscope. The results indicate that compared to continuous UV aging， the light-dark alternating UV aging has a more significant effect on the rheological properties of asphalt. After light-dark alternating UV aging， the base asphalt exhibits more severe deterioration in its rheological performance at both high and low temperatures， with poorer fluidity and lower temperature sensitivity at moderate temperatures. At the same depth， the number and total area of the honeycomb structures in the asphalt are decreased， indicating deeper diffusion of aged substances within the asphalt and a higher degree of aging.