This research aimed to study on the characteristics of base course materials and to determine reliable mathematical material models for the improvement in the current pavement design criteria. In this study, there were two relevant factors of both pavement materials which are considered in order to fulfil a lack of understanding in realistic conditions in pavements of the current pavement design. 1) The material strength which indicates the limitation and stability of pavement materials under traffic loads. This study defined the limitation of material implementation and also...