Method for preparing hot-mixed asphalt mixture

A method for preparing a hot-mixed asphalt mixture, comprising the following steps:

• preheating asphalt and aggregates separately, wherein the aggregates comprise coarse aggregates and fine aggregates;
• subjecting the coarse aggregates, part of the fine aggregates and the asphalt that are preheated to a first mixing to obtain a first mixture;
• adding the remaining fine aggregates to the first mixture for a second mixing to obtain a second mixture;
• and
• adding a mineral powder to the second mixture for a third mixing, and conducting discharging to obtain a hot-mixed asphalt mixture;
• wherein, the total work of adhesion of the coarse aggregates and the partial fine aggregates corresponding to asphalt during the first mixing has a ratio of 0.98 to 1.02 with that of the remaining fine aggregates corresponding to asphalt during the second mixing, and the partial fine aggregates have a specific surface area (SSA) smaller than that of the remaining fine aggregates;
• the total work of adhesion is calculated by formula 1:
• ΔG=SSAi·Wasi formula 1;
• and in formula 1, ΔG represents the total work of adhesion, mJ·Kg−1;
• SSA, represents the SSA of coarse aggregates or fine aggregates, m2·Kg−1;
• Wasi represents the work of adhesion of coarse aggregates or fine aggregates corresponding to asphalt, mJ·m−2;
• and represents summation.