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,
• wherein the coarse aggregates are basalt having a particle size of 5-15 mm or a combination of limestone having a particle size of 3-5 mm and basalt having a particle size of 5-15 mm;
• and wherein the fine aggregates are limestone having a particle size of no larger than 3 mm;
• 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 only 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 the hot-mixed asphalt mixture;
• wherein a ratio of a total work of adhesion of the coarse aggregates and the part of the fine aggregates corresponding to asphalt during the first mixing to a total work of adhesion of the remaining fine aggregates corresponding to asphalt during the second mixing is in a range of 0.98 to 1.02, and the part of the fine aggregates have a surface area (SA) smaller than that of the remaining fine aggregates;
• the total work of adhesion is calculated by formula 1:
• ΔG=ΣSAi·Wasi formula 1;
• and in formula 1, ΔG represents the total work of adhesion, mJ;
• SAi represents the SA of coarse aggregates or fine aggregates, m2;
• Wasi represents the work of adhesion of coarse aggregates or fine aggregates corresponding to asphalt, mJ·m−2;
• and Σ represents summation.