the role of mineral powder
1. Fill asphalt mixture: It is used to fill the gap before the asphalt mixture and reduce the void ratio before the mixture, which can increase the compactness of the asphalt mixture and also improve the water resistance and durability of the asphalt mixture. Mineral fines are also sometimes referred to as fillers.

2. To increase the cohesiveness of bitumen: Because mineral powder contains a lot of minerals, the minerals are easy to combine with asphalt molecules, so asphalt and mineral powder can work together to form asphalt cement, which can increase the adhesion of asphalt mixture.

3. Improve road quality: Asphalt is not only prone to settlement, but also prone to cracking due to environmental temperature and other influences. Therefore, adding mineral powder helps to improve the strength and shear resistance of asphalt mixture, and can also reduce the cracking and spalling of asphalt pavement.

Why can't the drum asphalt mixing plant add mineral powder?

The aggregate heating and mixing of the drum asphalt mixing plants are carried out in the same drum, and the inside of the drum can be divided into a drying area and a mixing area. Moreover, the dust removal system must be installed at the end of the flow direction of the hot air flow, that is, on the opposite side of the burner, because if it is installed on the same side, the wind will take away the hot air flow, so the dust removal system of the drum type asphalt mixing plant It is installed at the end of the stirring area. Therefore, if mineral powder is added to the drum, the bag filter will take the mineral powder away as dust, thus affecting the gradation of the asphalt mixture. To sum up, the drum type asphalt mixing plant cannot add mineral powder.