In order to investigate the influence of aggregate gradation on skeleton structure of asphalt macadam base,the exponential value method and uniform design method were applied to analyze the relationship between coarse aggregates relative proportion and the voids in the coarse aggregate [VCADRC] of asphalt macadam base.

In order to avoid gravity segregation and retain reasonable workability and homogeneity of fresh concrete mixtures,the volume fraction of the coarse aggregate in ordinary plastic concrete must be kept at a low level,and most of the coarse aggregates must be suspended in the mortar even if there are some contacts among them.

Seven different coarse aggregates are selected in this paper and its basic physical and mechanical capabilities are measured according to the criterion.

The influences of rough aggregate on mechanical properties of concrete;

Vibration analysis on coarse aggregate gradation of interlocking-dense cement concrete;

Effect of coarse aggregate size distribution on concrete strength development process;

Effect of particles size of coarse aggregate on stability of aggregate blend;

By adjusting "reserved voidage", "coarse aggregate volume ratio" and "coarse aggregate chosen density", the paper studied the relationship between the three parameters, the air void ratio and pavement performance of porous asphalt mixture, hence recommended the good performance porous asphalt mixture and applie