摘要
为探索沥青老化过程中微观结构变化对其宏观力学性能的内在影响机制,结合动态剪切流变仪测定的流变学参数与红外光谱仪及荧光显微镜获取的化学官能团和微观结构数据,揭示了基质沥青与SBS改性沥青在不同老化阶段的宏-微观性能关联。研究发现,SBS改性沥青的微观空间网络结构赋予其卓越的黏弹特性。识别了SBS改性剂特有的红外光谱特征峰,为快速识别和评估SBS改性沥青提供了一种方法。通过灰色关联度分析,发现官能团指数与复数剪切模量的关联度排序为:亚砜基官能团指数>芳香环官能团指数>羰基官能团指数,与沥青表面能的关联度顺序为:芳香环官能团指数>羰基官能团指数>亚砜基官能团指数。研究进一步证实,沥青老化过程中官能团的氧化和微观形貌的重构是影响其复数剪切模量变化的关键因素,为沥青材料的老化行为提供了新的理论解释。
This study aimed to elucidate the inherent influence mechanism of microstructural changes on the macroscopic mechanical properties of asphalt during its aging process.By combining rheological parameters obtained from a dynamic shear rheometer and chemical functional groups and microstructure data analyzed by infrared spectroscopy and fluorescence microscopy,the macro-micro correlations in both matrix and SBS modified asphalts at various stages of aging were unveiled.The findings reveal that the microspatial network structure characteristic of SBS modified asphalt endows it with excellent viscoelastic properties.Additionally,the distinctive infrared spectral feature peak of SBS modified asphalt has been identified,offering a novel method for the rapid identification and assessment of SBS modified asphalt.Utilizing grey relational analysis,the following order of correlation between the content of functional groups and the complex shear modulus is determined:sulfoxide group>aromatic ring>carbonyl.Furthermore,the sequence of correlation between the content of functional groups and asphalt surface energy is as follows:aromatic ring>carbonyl>sulfoxide group.These findings further substantiate that the oxidation of functional groups and the reconfiguration of microstructural morphology are pivotal in influencing the variation of the complex shear modulus throughout the aging of asphalt,offering a fresh theoretical perspective on the aging behavior of asphalt materials.
作者
郭猛
何舒欣
龚演
严二虎
梁美琛
GUO Meng;HE Shuxin;GONG Yan;YAN Erhu;Liang Meichen(National Key Laboratory of Bridge Safety and Resilience,Beijing University of Technology,Beijing 100124,China;The Key Laboratory of Urban Security and Disaster Engineering of Ministry of Education,Beijing University of Technology,Beijing 100124,China;Research Institute of Highway Ministry of Transport,Beijing 100088,China)
出处
《交通运输研究》
2024年第1期58-69,共12页
Transport Research
关键词
沥青老化
流变力学
荧光显微镜
红外光谱
表面能
灰色关联分析
asphalt aging
rheological mechanics
fluorescence microscopy
infrared spectrum
surface energy
gray correlation analysis
