Cement/emulsified asphalt composite repair material (CEACRM) is a pavement crack repair material mainly formed by mixing cement and emulsified asphalt; however, ultraviolet (UV) light causes its aging and affects its repair performance. In this work, the UV aging test of CEACRM was carried out to analyze the effect of aging on the viscoelastic mechanical properties of CEACRM and determine the aging mechanism and influencing factors. The creep test and frequency scanning test of aged CEARCM samples were carried out using a dynamic shear rheometer. The microstructure of CEACRM was studied by a scanning electron microscope. The effect of aging on CEACRM properties was studied by component analysis and infrared spectrum. Results show that aging deteriorates the viscoelastic properties of CEACRM and reduces its deformation and energy dissipation abilities, thereby diminishing its service performance. With further aging, the properties of CEACRM change from viscoelastic to elastic. Cement content and the microstructure formed by the interaction of cement and asphalt affect the aging resistance of CEACRM. Properly increasing the amount of cement can slow down the aging speed of CEACRM and improve the stability of mechanical properties of CEACRM.

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