老化时间对 SBS 改性剂与沥青胶结料官能团的影响.

To investigate the trend of functional groups of matrix asphalt, styrene butadiene styrene ( SBS) modifiers, and their modified asphalt with aging time, and to analyze their aging modes. Using Fourier transform infrared spectroscopy (FTIR) and bending beam rheometer (BBR) tests, low-temperature performance tests were conducted on two types of asphalt binders aged for 0, 1, 5, 8, 24, 48, 72 h. Functional group analysis was conducted with SBS modifier to establish the relationship between the functional groups of the two asphalt binders and their low-temperature performance. The results show that SBS modifier aging are contributed by polybutadiene and polystyrene, the SBS modifier aging mode is degraded mainly alkene and alkane in the thermal oxidation process. Two kinds of asphalt binders aging mode are volatilized light oil and reacted with oxygen to form a cross-linked. The trend of SBS modifier at the characteristic peaks in infrared absorption spectra is different and independent of its modified asphalt. Two kinds of asphalt binders carbonyl index is correlative with creep compliance derivative, and low-temperature deformation capacity of asphalt binder is reflected by carbonyl index. [ABSTRACT FROM AUTHOR]