直投式 SBS 改性沥青抗老化性能研究.

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. [ABSTRACT FROM AUTHOR]