Proposing a new infrared index quantifying the aging extent of SBS-modified asphalt

Abundant studies are using Attenuated Total Reflection (ATR) Fourier Transform infrared spectroscopy to quantitatively evaluate the aging extent of Styrene–Butadiene–Styrene (SBS)-modified asphalt (SBSMA). However, most currently employed SBS characteristic indexes merely represent the SBS concentration within SBSMA and may fluctuate during aging because of the poor compatibility between SBS and bitumen. In this study, a new index calculated by...