ABSTRACT
The objective of this study was to investigate the dynamic structural characteristics of unbound aggregates with quantitative expressions. Specimens were fabricated with top-down surface vibrations, saturated and unsaturated specimens were administrated to load dynamically with 3000 repetitions at three different stress states. Three coefficients, including dynamic structural stability, structural variability, and dynamic load structural coefficient were defined that are useful to investigate the dynamic characteristics of water susceptibility in fine aggregates and skeleton stability of coarse aggregates. It was also found that dynamic load structural coefficient of unbound aggregates was not sensitive when the confining pressure was more than 150 kPa, It may suggest that the rather lower confining pressure, less than 150 kPa, should be adopted. The outcome of this study showed that it is feasible to evaluate structural characteristics of unbound aggregates with dynamic load structural coefficient.
