Detection and analysis method for rapidly dividing SBS modified asphalt aging process

The invention provides a detection and analysis method for rapidly dividing an SBS modified asphalt aging process, and relates to the technical field of road engineering. The method for rapidly dividing the aging process of the SBS modified asphalt comprises the following steps: firstly, carrying out Fourier transform infrared spectroscopy (FTIR) test on an unaged SBS modified asphalt sample to obtain an unaged SBS copolymer index IB0/S0 and matrix asphalt sulfoxide group, aliphatic group, aryl group and carbonyl functional group indexes SI0, IB, aI0, ARI0 and CI0, and then carrying out FTIR test on a finished product SBS modified asphalt sample or an in-service SBS modified asphalt pavement sample to obtain the aging process of the SBS modified asphalt. Obtaining the actual IB/S index and the numerical values of the indexes SI, IB, aI, ARI and CI of each matrix asphalt functional group; the aging process of the SBS modified asphalt is divided into an SBS polymer swelling stage, an SBS polymer degradation sta