The Effect of Aging on the Molecular Distribution of Crumb Rubber Modified Asphalt Based on the Gel Permeation Chromatography Test

Asphalt aging is one of the main causes asphalt pavement cracking, loosening and other issues. On a macro level, hardens becomes more brittle, while on micro chemical composition molecular weight distribution change. This very complicated physicochemical process. Gel permeation chromatography (GPC) powerful technical tool for understanding mechanism expressing GPC can be used to measure content each component in The action crumb rubber modified has not been fully elucidated due its complex composition. study investigated before after aging, filtered based gel chromatography. results indicated that itself experiences severe degradation following PAV significant number macromolecular materials are incorporated into phase, causing changes key parameters. average (Mw) dispersion (D) directly related. At same time, Mw positive correlation with LMS content, SMS negative Mw. increase impact material interaction, affected by reaction degree asphalt. physical direct external rheological properties