Optimization criterion of viscoelastic response model for asphalt binders

• We compared fitting results under optimization criteria based on dynamic, static data and all data.
• The viscoelastic response model under optimization criterion based on all data shows the best fitting result.
• The ranking of optimization criteria is criterion based on all data, dynamic data and then static data.

The viscoelastic response model is widely used in characterizing the viscoelastic properties of asphalt binders. However, the viscoelastic response model parameters depend heavily on the optimization criterion. The predict ability of the models vary under different criteria. Most viscoelastic response model parameters were obtained by dynamic data or static data. The models determined by these methods can only well describe one type of viscoelastic properties of asphalt binders. In this paper, the generalized Maxwell model was employed as the viscoelastic response model for asphalt binders, and three types of optimization criteria were applied to get the model parameters. The advantages and disadvantages of these criteria were compared afterwards. Based on the results, it is concluded that the generalized Maxwell model under optimization criterion based on all data can well describe both dynamic and static behaviors of asphalt binder. Also, the rank of the optimization criteria is as follow: criterion under all data, criterion under dynamic test, and criterion under static test.