Effects of Aging on the Multiscale Properties of SBS-Modified Asphalt

This study investigated the effects of aging on the micromechanics, chemical functional groups, and rheological properties of SBS-modified asphalt, with the help of atomic force microscopy, Fourier transform infrared spectroscopy, and dynamic shear rheometry, respectively. Aging has a significant effect on the micromechanics of asphalt and its distribution, especially in the pressure aging–vessel aging process. The micromechanics are affected by the chemical functional groups directly, and the resulting changes are the outcome of the synergistic effect of the aging of base asphalt and the degradation of the SBS modifier. The micromechanics were quantitatively consistent with the rheological properties, thus indicating that the micromechanics of the asphalt surface contribute to the macro-mechanical behavior. Such a systematic approach for the characterization of the aging process of SBS-modified asphalt could provide a scientific method for improving the properties and recycling of SBS-modified asphalt.