초록 ▼

In a process for producing asphalt-aggregate composition in which used asphaltic concrete is recycled by being heated and mixed in a rotatable drum into which flame and hot gases of combustion are directed, the improvement comprises introducing virgin aggregate in a hot zone of the drum and directly

In a process for producing asphalt-aggregate composition in which used asphaltic concrete is recycled by being heated and mixed in a rotatable drum into which flame and hot gases of combustion are directed, the improvement comprises introducing virgin aggregate in a hot zone of the drum and directly exposing the aggregate to the flame and/or hot gases of combustion, and introducing particles of asphalt-aggregate composition downstream from the hot drum input end, away from direct exposure to the flame and extremely hot gases, in a cooler temperature zone. An improved apparatus includes means for introducing the aggregate at the input drum end for direct exposure to the flame or hottest gases, and means for introducing the used and recycled asphalt-aggregate composition in a cooler drum zone.

대표청구항 ▼

Apparatus for heating and mixing asphalt-aggregate composition comprising (a) an elongated rotatable drum having an input end and an opposite output end, (b) means for supplying hot gases of combustion at said input end and for directing said hot gases substantially along the length of said drum bet

Apparatus for heating and mixing asphalt-aggregate composition comprising (a) an elongated rotatable drum having an input end and an opposite output end, (b) means for supplying hot gases of combustion at said input end and for directing said hot gases substantially along the length of said drum between said input and said output ends whereby said composition is gradually heated therebetween, (c) first means for supplying aggregate particles into said drum at a hot zone whereby said aggregate is directly exposed to said hot gases, (d) second means for introducing asphaltic concrete particles comprising a mixture of asphalt and aggregate to said drum in a cooler zone whereby said asphaltic concrete is directly exposed to said hot gases in said cooler zone, and (e) means for recovering heated and mixed composition at said output end.