To investigate the reasons of different performance of asphalt mixture

volume index and structural parameters were measured in asphalt mixtures with different flat and elongated particles content. Void ratio of asphalt mixture was calculated based on industrial CT scanning and image processing technology

and color scale was used to mark the void structure. The parameters such as area

aspect ratio-AR1 and AR2

mean value of spindle deflection angle

particle trend parameter-Δ and angularity were adopted to evaluate the structural characteristics of asphalt mixture. Results show that with the increase of flat and elongated particles

the volume density of asphalt mixture decreases and the porosity increases

and the void ratio calculated by industrial CT is larger than the measured. Macro-pore structure is mainly distributed in the middle and lower part of the specimens

but the voids at the top of the specimens are smaller. With the increase of the flat and elongated particles content in mixture

the aspect ratio expectation of particles-AR1

AR2 and angularity expectation increases

and the cross section area of coarse aggregate particle decreases

but the influences on the mean deviation of deflection angle and grain trend are not obvious.