In order to simplify the design process of asphalt concrete mix proportion, the correlation between raw material parameters and design indexes of asphalt concrete were studied. The application of dense graded asphalt concrete in several expressways was systematically investigated. Fractal theory was used to characterize the mineral aggregate gradation. The fractal dimension and asphalt aggregate ratio distribution of dense graded asphalt concrete commonly used in existing projects were clarified. Based on AC-13 and AC-20 asphalt concrete, the design index prediction equation of asphalt concrete was constructed. The results show that: the unique fractal dimension can be used to characterize the gradation of different dense graded asphalt concrete, the fractal dimension of mineral aggregate of dense graded asphalt concrete used in engineering is basically between 2.44 and 2.54; with the increase of asphalt aggregate ratio, the void ratio and saturation of dense graded asphalt concrete formed under standard conditions gradually decrease, thus the optimum asphalt-aggregate ratio can be predicted based on void ratio and saturation equation; the fractal dimension of mineral aggregate has a significant impact on the stability of asphalt concrete, which grows with the increase of the fractal dimension of mineral aggregate; in the production mix proportion verification stage, the concrete fractal dimension can be reversely deduced based on the stability test, and the difference between the production mix proportion and the design mix ratio can be compared to optimize the mix proportion verification process at the present stage.
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