Performance analysis and viscosity modeling of emulsified cutback composite cold-mixed epoxy asphalt binder

The extremely low mixing temperature benefits the environment and energy savings of cold -mixed asphalt mixtures but limits their performance. Developing a superior cold -mixed asphalt binder is crucial to enhancing their performance. In this paper, a composite cold -mixed epoxy asphalt binder (CCEAB) is proposed, whose materials include the emulsifier and cutback. The properties of CCEAB such as stability, dispersity, softening point, penetration, ductility, adhesion, volatilization and apparent viscosity are analyzed. The viscosity model is reasoned based on the time -temperature equivalent principle. The results showed that the cold -mixed solvent (CMS) and diluted epoxy resin (DER) are evenly dispersed in the stable CCEAB. The function of CMS is to lessen the viscosity of the base asphalt and the role of DER is to improve the mechanical performance of the CCEAB. The softening point, penetration, ductility, adhesion and viscosity of CCEAB are satisfactory when the dosage of CMS and DER is recommended to be less than 15%. CCEAB has excellent thermal stability, plasticity, low -temperature stability, adhesion and qualified shear ability. The curing time of CCEAB is approximately 28 days and the viscosity is 2.1 times the initial viscosity after curing. If the shear rate value is below the viscosity value, the viscosity model with exponential form is equivalent to the power law model in fluid mechanics.