초록 ▼

An asphalt production system utilizing a pair of rotatable drums for producing an asphaltic composition is provided. The asphaltic composition is produced by separately heating a volume of virgin aggregate material in a countercurrent drum dryer and heating a volume of recycle material in a parallel

An asphalt production system utilizing a pair of rotatable drums for producing an asphaltic composition is provided. The asphaltic composition is produced by separately heating a volume of virgin aggregate material in a countercurrent drum dryer and heating a volume of recycle material in a parallel flow drum mixer. The hot virgin aggregate material is mixed with the heated recycle material at an intermediate location within the parallel flow drum mixer. A ducting system is provided for interconnecting the ends of the drums such that the hot exhaust gases from one drum are circulated into the other drum thus producing a common flow of exhaust gases between the drums.

대표청구항 ▼

A method for producing an asphaltic composition comprising the steps of: introducing virgin material into a first inclined rotating drum such that the virgin material flows through the first drum; creating a first stream of hot gases; directing the first stream of hot gases through the first drum su

A method for producing an asphaltic composition comprising the steps of: introducing virgin material into a first inclined rotating drum such that the virgin material flows through the first drum; creating a first stream of hot gases; directing the first stream of hot gases through the first drum such that the hot gases travel in the opposite direction as the virgin material; introducing recycle material into a second inclined rotating drum such that the recycle material flows through the second drum; creating a second stream of hot gases; directing the second stream of hot gases through the second drum such that the hot gases travel in the same direction as the recycle material; collecting the virgin material from the first drum; mixing the collected virgin material with the recycle material by adding the collected virgin material to the second drum at an intermediate point on the second drum; and collecting the mixed materials from the second drum.