Li Limin, Guo Zhaoyang, Ran Longfei, Zhang Jiewen
School of Civil and Environmental Engineering, Hunan University of Science and Engineering, Yongzhou 425199, China.
Inner Mongolia Communications Construction Engineering Quality Supervision Bureau, Hohhot 010050, China.
Materials (Basel). 2020 Mar 27;13(7):1541. doi: 10.3390/ma13071541.
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.
沥青的低温抗裂性能被认为是沥青路面的主要劣化现象之一。然而，关于热和光共同作用下沥青低温抗裂性能的研究较少。因此，结合延度试验、弯曲梁流变仪（BBR）试验和沥青成分分析试验，基于中国的气候条件研究热和光共同作用下的低温抗裂性能。本研究采用不同改性剂类型和基质沥青制备了苯乙烯-丁二烯-苯乙烯嵌段共聚物（SBS）改性沥青结合料。结果表明，热和光共同作用下沥青的低温抗裂性能降低。在早期明显降低，且随着老化时间、温度和紫外线（UV）强度的增加而变差。沥青成分对其低温抗裂性能有显著影响，SBS改性剂可提高沥青的低温抗裂性能。合理选择基质沥青和改性剂可提高沥青的低温抗裂性能。在热和光共同作用下，无论是基质沥青还是改性沥青，其延度和组分含量的变化趋势相似。因此，为提高沥青路面的抗裂能力，建议采用热和光共同老化15天的沥青延度作为沥青低温抗裂性能的评价指标，并应根据沥青路面使用地区的温度和UV强度选择沥青。
