Civil Engineering Reference
In-Depth Information
Hot mix
conveyor
Cold feed
conveyor
Mix
surge
silo
Dust
collector
Cold feed bins
Asphalt storage
Asphalt pump
FIGURE 9.38
Continuous (drum) mix asphalt concrete plant.
9.12
Recycling of Asphalt Concrete
Recycling pavement materials has a long history. However, recycling be-
came more important in the mid-1970s, after the oil embargo, due to the in-
crease in asphalt prices. In an effort to efficiently use available resources,
there was a need to recycle or reuse old pavement materials (The Asphalt In-
stitute 1989). Although the pavement could be badly deteriorated, the old
asphalt concrete materials could be successfully reused in new pavements.
Currently, recycling of old pavement materials is becoming a normal prac-
tice due to the following advantages:
1. economic saving of about 25% of the price of materials
2. energy saving in manufacturing and transporting raw materials
Search WWH ::
Custom Search