为了探究高掺量胶粉改性沥青的老化作用机理，借助20%、25%和30%三种不同掺量的橡胶沥青，采用四组分分析实验和红外光谱实验，评价老化橡胶沥青的四组分指标变化，并分析老化前后的化学组成和官能团变化，通过对比研究，揭示高掺量胶粉改性沥青在不同老化条件下的老化机理。结果表明：老化对高掺量胶粉改性沥青的组分影响更显著。20%掺量时，饱和分、芳香分和胶质分别降4.4%、3.4%、4.3%，沥青质增117.7%；25%掺量橡胶沥青饱和分下降5.0%、芳香分下降8.4%、胶质下降4.9%、沥青质增加119.3%，30%掺量时，降幅更大，分别为7.4%、9.5%、6.0%，沥青质增至128.9%；老化过程中，高掺量胶粉改性沥青的质量损失较小，沥青中轻质组分结合与裂解橡胶结合减少了轻质组分活性并增强了抗老化性；高掺量改性沥青在老化条件下羰基与亚砜基指数增长更显著，可能导致性能下降，其橡胶与沥青的相容性在老化中更易受影响，表现为更剧烈的硫化现象和分子链交联的变化。研究成果为橡胶沥青老化作用机理提供了理论支撑，并为高掺量胶粉沥青路面的实际应用与养护提供了借鉴，对提升橡胶沥青路面性能具有重要意义。

In order to investigate the aging mechanism of high dosage rubber powder modified asphalt, with the help of 20%, 25% and 30% of three different dosages of rubber asphalt, using four-component analysis experiment and infrared spectroscopy experiment, evaluation of aging rubber asphalt four-component indexes change, and analyze the chemical composition and functional group changes before and after aging, through the comparative study, to reveal high dosage rubber powder modified asphalt aging mechanism under different aging conditions. The aging mechanism of high doped rubber powder modified asphalt under different aging conditions was revealed through comparative study. The results show that: the aging of high dosage rubber powder modified asphalt components more significant. 20% dosage, the saturation fraction, aromatic fraction and gum decreased by 4.4%, 3.4%, 4.3%, respectively, asphaltene increased by 117.7%; 25% dosage of rubber asphalt saturation fraction decreased by 5.0%, the aromatic fraction decreased by 8.4%, gum decreased by 4.9%, asphaltene increased by 119.3%, and 30% dosage, the decrease is greater, respectively, 7.4%, 9.5%, 6.0%, asphaltene increased to 128.9%; aging process, high dosage of rubber powder modified asphalt has less mass loss, the combination of light components of the asphalt and cracked rubber binding reduces the light component activity and enhances the resistance to aging; high dosage of modified asphalt in the aging conditions of carbonyl and sulfoxide group index growth is more significant, which may lead to a decline in the performance of the The compatibility of rubber and asphalt is more susceptible to aging, which is manifested by more intense vulcanization phenomena and changes in molecular chain cross-linking. The research results provide theoretical support for the aging mechanism of rubber asphalt, and for the practical application and maintenance of high dosage of rubber powder asphalt pavement, which is of great significance to improve the performance of rubber asphalt pavement.