Effect of deep aging on the structure and properties of SBS-modified asphalt
TIAN Qin
XU Shi
YANG Xingkui
YU Kunlong
CHEN Bowen
LIU Muyu
Abstract：The aging test of SBS asphalt was carried out by rotating film oven(RTFOT)and pressure aging apparatus(PAV),simulating short-term aging and four different degrees of long-term aging of asphalt pavement,the influence of aging on the physi-cal properties and rheological properties of SBS modified asphalt was investigated,and the changes in chemical composition of SBS modified asphalt during aging were analyzed using Fourier infrared spectroscopy(FTIR)and gel permeation chromatography(GPC).The results show that,as aging progressed,the penetration of SBS-modified asphalt gradually decreased,the dynamic shear modulus consistently increased,and the softening point initially decreased before increasing.Under the PAV aging conditions of deep aging(40～80 h),the improvement in high-temperature deformation resistance and elastic recovery efficiency of SBS modified asphalt are significantly reduced,the asphalt becomes more prone to low-temperature cracking.During the deep aging process,SBS undergoes degradation,and asphalt molecules undergo thermal oxidative aging and polymerization into heavy components.
Keywords：SBS-modified asphaltdeep agingMSCRchemical structure
Publication Date：2025-06-25
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：4( 15-18 )