【摘要】 直投式SBS改性沥青具有易于监管质量、成本低和污染小等优势，能够解决常规湿法SBS改性沥青的质量不稳定的问题，近年来逐渐被广泛应用。为此，对不同掺量下直投式改性沥青进行短期老化，通过对老化后的直投式改性沥青进行温度扫描试验、中温疲劳性能测试、低温流变性能测试及原子力显微镜测试，从宏观到微观尺度研究直投式SBS改性沥青的抗老化性能。宏观试验结果表明，直投式SBS改性沥青在短期老化后弹性成分增加，疲劳寿命增加。国路直投式SBS改性沥青在老化过程中存在二次发育现象。微观试验结果表明，短期老化后，常规湿法SBS改性沥青与辽河直投式SBS改性沥青由于4组分含量的变化及SBS的裂解导致粗糙度减小，国路直投式SBS改性沥青由于进一步溶胀发育导致其表面粗糙度增大，与宏观试验得到的结论一致。更多还原

【Abstract】 Direct-injection SBS modified asphalt has advantages such as easy quality control, low cost, and minimal pollution. It can address the issue of unstable quality in conventional wet-process SBS modified asphalt and has been gradually widely applied in recent years. This study investigated the aging resistance performance of direct-injection SBS modified asphalt at different dosages through short-term aging. By conducting temperature scanning tests, mid-temperature fatigue performance tests, low-temperature rheological property tests, and atomic force microscope tests on the aged direct-injection modified asphalt, the aging resistance performance of the SBS modified asphalt was studied from macroscopic to microscopic scales. The macroscopic experimental results indicated that the direct-injection SBS modified asphalt exhibited an increase in elastic components and fatigue life after short-term aging.During the aging process, the Guolu direct-injection SBS modified asphalt showed a secondary development phenomenon. The microscopic test results revealed that, after short-term aging, both conventional wet-process SBS modified asphalt and Liaohe direct-injection SBS modified asphalt exhibited reduced roughness due to changes in the content of the four components and the degradation of SBS. In contrast, the Guolu direct-injection SBS modified asphalt exhibited increased surface roughness due to further swelling development, consistent with the conclusions drawn from the macroscopic tests.更多还原