Evaluation methods of dynamic structural characteristics of unbound aggregate materials

The unbound aggregate materials were of very strong dynamic structural characteristics in pavement structure.However,the depiction of structural characteristics was qualitative at present.In order to discuss quantitative parameters of structural properties of the unbound aggregate materials the specimens were adopted by use of the surface vibrating method.Water was regarded as the disarranging factor,and unsaturated and saturated specimens were loaded 3000 times at different stress states.According to the failure modes of the unbound aggregate materials based asphalt pavement,the dynamic structural stabilizability,structural changeability and comprehensive structural parameters of the unbound aggregate materials were defined.It was indicated by the test results that was reflected the water stability of filling material by the dynamic structural stabilizability parameter,and the arrangement stability of skeleton materials was depicted by be structural changeability parameter.These two parameters reflected the two respects of the dynamic structural characteristics,when the confining pressure σ3≧150 kPa,the dynamic structural parameter was not sensitive,and it should be determined under small confining pressure.It was feasible to evaluate the structural characteristics of the unbound aggregate materials dynamic by use of the structural parameters.