Study on the Regeneration and Modification Mechanisms of Cold-Patch Asphalt Using FTIR and AFM

为探究冷补沥青混合料中再生剂与改性剂对老化沥青的微观作用机制，本文基于傅里叶变换红外光谱(FTIR, Fourier Transform Infrared Spectroscopy)与原子力显微镜(AFM, Atomic Force Microscopy)技术，系统分析了废机油(再生剂)、SBR胶乳及石油树脂(改性剂)对老化沥青的化学结构及微观形貌的影响。FTIR结果表明，再生与改性过程中未生成新的官能团，再生、改性作用属于物理共混；AFM图像显示，废机油能有效“削平”老化沥青表面的粗糙结构，SBR与石油树脂则进一步构建出均匀致密的聚合物网络，提升了材料的力学性能。研究进一步将微观形貌演变与宏观路用性能建立关联，结合多尺度评价体系理念，为冷补沥青再生剂的配方优化提供了微观层面的理论支持。To investigate the microscopic interaction mechanisms of rejuvenators and modifiers on aged asphalt within cold-patch asphalt mixtures, this study systematically analyzed the effects of waste engine oil (rejuvenator), SBR latex, and petroleum resin (modifiers) on the chemical structure and micro-morphology of aged asphalt using Fourier Transform Infrared Spectroscopy (FTIR) and Atomic Force Microscopy (AFM). The FTIR results indicate that no new functional groups are generated during the rejuvenation and modification processes, suggesting that the modification is a physical blending process. AFM images reveal that waste engine oil effectively “flattens” the rough structure on the surface of aged asphalt, while SBR and petroleum resin further construct a uniform and dense polymer network, thereby enhancing the mechanical properties of the material. Furthermore, this study establishes a correlation between the evolution of micro-morphology and macroscopic pavement performance, and incorporates the concept of a multi-scale evaluation system, thereby providing microscopic theoretical support for the formulation optimization of cold-patch asphalt rejuvenators.