State of the art of the aging mechanism,characterization and evaluation of CRM A at home and abroad are summarized.The aging process of CRMA is accompanied by swelling,degradation reaction of crumb rubber and the interaction between asphalt and crumb rubber.The aging behavior of CRMA is mainly characterized from the chemical components,molecular structure,molecular weight and surface morphology,and their effects on macroscopic properties are explained.Rheological parameters such as viscosity,complex shear modulus,creep stiffness at low temperature and fatigue life are mainly used to evaluate the aging performance of CRMA,which are usually combined with microscopic characterization and chemical methods.However,during the aging process of CRMA,the migration behavior of fillers,e.g.,carbon black,white carbon black,received less attention.In addition,there is a lack of simultaneous characterization method for multi-component aging characteristics of CRMA.There are no universal aging evaluation indexes for CRMA,and most of the studies are insufficient in the aging performance verification at mixture level.The development trend and prospect of aging mechanism,characterization and evaluation of CRMA are proposed.
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