Two-stage design method for target mix proportion of asphalt mixture

The invention discloses a two-stage design method for the target mix proportion of an asphalt mixture, and relates to a design method for the target mix proportion of the asphalt mixture. The first-stage target mix proportion design comprises the steps that 1, raw materials are selected; 2, the quality of the raw materials is monitored and controlled; 3, material preparation is guided according to the aggregate median mix proportion; the second-stage target mix proportion design comprises the steps that 1, screening and monitoring are conducted in the material preparation process; 2, the blending proportion of the synthetic graded mineral aggregate is calculated by a trial blending method; 3, the fluctuation of the blending ratio is analyzed; 4, the optimal asphalt dosage and the final target mix proportion are determined; 5, the performance of the mixture is inspected; and 6, the proportion and quantity of subsequent prepared materials is inspected. By reducing the fluctuation of the mineral aggregate propor