为明确SBS与CR在沥青复合改性体系及其老化过程中的“竞争”作用机制，制备了SBS、CR单一及复合改性沥青，分别进行了热氧老化、紫外老化以及耦合老化。借助棒状薄层色谱-氢火焰离子探测仪（TLC-FID）和荧光显微镜（FM），从沥青微观化学组分和形貌特征角度揭示了复合沥青改性和老化过程中的“竞争”作用机制。结果发现，SBS、CR的改性作用虽打破了石油沥青四组分原有的平衡，但会明显促进沥青胶体结构稳定性提升，而老化后改性剂明显降解，沥青胶体结构趋于不稳定。此外，复合沥青改性及老化过程中主要存在两种“竞争”作用：一方面，改性过程中SBS对沥青轻质组分的“竞争”吸收能力约是CR的5倍，塑化剂的掺入提前参与CR的预溶胀可在保证CR溶胀效果的同时补充沥青轻组分；另一方面，不同老化作用下SBS和CR间的降解也存在“竞争”作用，相较之下SBS易在热环境中降解，而CR更易在紫外辐射下降解。

To clarify the competitive interactive mechanism between SBS and CR in the composite asphalt modification system and its aging process, SBS, CR single and composite modified asphalt were prepared and subjected to thermal oxygen aging, UV aging, and coupling aging, respectively. The "competition" mechanism during the modification and aging process of composite asphalt was revealed from the perspective of the microscopic chemical composition and morphology characteristics of asphalt using thin-layer chromatography with flame ionization detection (TLC-FID) and fluorescence microscope (FM). The results showed that though the modification effects of SBS and CR would break the original balance of the four components of petroleum asphalt, they significantly promoted the stability improvement of asphalt colloid structure. After aging, the modifier degraded significantly, and the asphalt colloid structure tended to be unstable. In addition, there were two main "competitive" effects in the modification and aging process of composite asphalt: on the one hand, during the modification process, the "competitive" absorption capacity of SBS for asphalt lightweight components was about five times that of CR, and the addition of plasticizers to participate in the pre-swelling of CR could ensure the swelling effect of CR while supplementing the lightweight components of asphalt. On the other hand, there was also a "competition" effect between the degradation of SBS and CR under different aging effects. In contrast, SBS was prone to degrade in a thermal environment, while CR was easier to degrade under UV radiation.