초록 ▼

In a process for producing asphalt-aggregate compositions in a conventional type dryer-mixer drum in which aggregate is exposed directly to flame and hot gases of combustion while it cascades in the rotating drum, and in which the flame and hot gases of combustion are directed into an input end of t

In a process for producing asphalt-aggregate compositions in a conventional type dryer-mixer drum in which aggregate is exposed directly to flame and hot gases of combustion while it cascades in the rotating drum, and in which the flame and hot gases of combustion are directed into an input end of the drum, the improvement comprises separating the aggregate into a plurality of different portions or increments each having different particle size ranges, introducing the coarse or larger aggregate particles into the drum and directly exposing them to the flame, its radient heat, hot gases of combustion at the input end, and introducing the finer or smaller aggregate particles downstream from the input end and away from direct exposure to the flame and extremely hot gases in a temperature zone which will avoid overheating the fine particles. The improved apparatus includes means for introducing the coarse particles at the input drum end for direct exposure to the flame or hottest gases and means for introducing the fine or smaller particles in a cooler zone of the apparatus.

대표청구항 ▼

A process for producing asphalt-aggregate compositions comprising: (a) separating non-asphalt containing aggregate into coarse particles and fine particles; (b) introducing said coarse particles in a hot zone of a rotatable drum and gradually heating and advancing said particles toward an output dru

A process for producing asphalt-aggregate compositions comprising: (a) separating non-asphalt containing aggregate into coarse particles and fine particles; (b) introducing said coarse particles in a hot zone of a rotatable drum and gradually heating and advancing said particles toward an output drum end; (c) introducing said fine particles in said drum downstream from said hot zone in a cooler temperature zone; (d) gradually mixing and heating said coarse and fine particles; and (e) adding and mixing asphalt with said particles downstream from said hot zone to produce said asphalt-aggregate composition.