Pengcheng Tu

Aug 16, 2023 | mdpi.com | Xiaodong Xie |Pengcheng Tu |Jingjing Fan |Jie Gao

3. The Aging Mechanism of Low-Grade Hard Asphalt 3.1. Aging Characteristics of Low-Grade Asphalt Based on FTIR 3.1.1. Infrared Spectral Characteristics of Asphalt before and after AgingFigure 2 illustrates the FTIR spectra of 30#, 50#, and 70# asphalt before and after short-term aging, long-term aging, and ultraviolet aging. In the functional group region, strong absorption peaks can be observed at 2923 cm−1 and 2853 cm−1, corresponding to C-H bond stretching vibrations.