To study the structure of asphalt concrete and enrich the characterization of asphalt concrete structure parameters

common volume parameters were summarized to analyze the composition and structural characteristics ofz asphalt concrete. Then

new volume parameters were constructed from different angles

and the parameters were classified and analyzed. Finally

within the scope of the AC-16 grading

five different gradations were obtained by changing the proportion of fine aggregate. Meanwhile

three different dosages of asphalt: 4.2%

4.7%

and 5.2% (the percentage of asphalt by mass in asphalt mixture) were set to investigate the influence of asphalt content on parameters. Standard Marshall specimens were made according to the existing asphalt mixture production test code requirements

and the volume index was determined. The constructed parameters were obtained by calculation

and the variation of the parameters with gradation and asphalt content was analyzed. Results show that the volume parameters changed obviously with the gradation of asphalt mixture and the change of asphalt content. The asphalt parameters VA

VM

and db had obvious linear relationship with the amount of asphalt in the mixture

and VM was related to Vf. The void parameters VMA

VK

and VV decreased first and then increased with the increase of Vf. When only changed the asphalt content

parameters VMA

VK

and VV decreased with the increase of the asphalt content. The aggregate parameters G

Vc

Vf

Vf /(1-c)

FBV

F1

F2

and Vc/fwere related to the proportion of coarse and fine aggregate and mineral powder in the mixture.