Method and apparatus for mixing asphalt compositions

Details Method and apparatus for mixing asphalt compositions Method and apparatus for mixing asphalt compositions

B - Operations, Transporting

28

C

259/8

B28C 5/46 (2006.01) E01C 19/10 (2006.01)

Patent

CA 1280108

ABSTRACT A drum mixer asphalt plant 10 is provided with a rotatable cylinder 34 having an internal passageway 114 where the aggregates and asphalt are mixed to produce an asphaltic composition. In a first zone 35, 36, 38 within the mixer 12, aggregates are heated and dried by heat radiation and the stream of hot gases produced by a burner 44 flame. In a second zone 40 within the mixer 12, liquid asphalt 124 is mixed with the aggregates. An exhaust tube 108, 110, 112 is disposed within the passageway 114 and extends from the output end 50 of the drum mixer 12 into the first zone 38 to remove the hot gases to prevent degradation of the asphalt. Thus, the second zone 40, 116 wherein the liquid asphalt 124 is mixed with the aggregate is isolated from the hot gases used for heating and drying. Recycle asphalt material may be added in both the first and second zones of the mixer drum 12.

539416

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