The recycled asphalt pavement will occur secondary aging during service,and then incur cracking,rutting and other road surface defects.In order to understand the changes of the rheological characteristics,fatigue resistance and chemical components of recycled asphalt in secondary aging,70#asphalt,SBS modified asphalt and asphalt pavement recovery material(RAP)extracted old asphalt are taken as study object,the rheological characteristics and fatigue resistance after secondary aging are explored through high temperature rheological test and time scanning test in dynamic shear flow meter.The characteristic functional groups are analyzed by a Fourier infrared spectrometer.The results show that the rut resistance of the three kinds of asphalt all increases with the deepening of aging,and the fatigue performance decreases accordingly.The addition of the regeneration agent has a negative impact on the rutting resistance of the asphalt.In addition,because the addition of SBS modified agent can inhibit the production of sulfoxide group and groups,the fatigue resistance of SBS modified asphalt is better than that of 70# bitumen.
关键词
再生沥青/二次老化/红外光谱/车辙因子/高温流变/疲劳性能
Key words
recycled asphalt/secondary aging/infrared spectrum/rutting factor/high temperature rheology/fatigue performance
维普
万方数据