Photo courtesy of Randy West
To transfer RAP from the bin, the recycle system includes a
heavy-duty weigh conveyor that features a channel frame and
wind shroud protection for accurate weighing. The conveyor
is 2-feet wide and, depending on the model, between 45- and
65-feet long. It introduces RAP to the dried aggregate mix after the heating process. Based on conditions and type of plant,
up to 50 percent of the HMA can contain recycled pavement.
An optional lump breaker is available for ADM's recycling
systems to break down large pieces of RAP into a usable size.
It has an adjustable steel breaker plate, replaceable tungstentipped teeth and is powered by a 30-horsepower, high-efﬁciency motor with an open-mesh covered V-belt drive. Singleand double-deck scalping screens are available so oversized
material doesn't enter the aggregate mix. Other options
include air cannons, grizzlies, bin extensions, adjustable legs
with sand shoes and a skid with bolt-on support legs.
Processed RAP stored under cover absorbs less moisture, requiring less heat in
the drum plant when incorporated into mix.
Web Extra: Read "Optimizing Use by
Processing" at www.BetterRoads.com.
sided stockpiles will create segregation within the pile," West
said in a 2009 presentation for the Minnesota DOT. As RAP
tends to retain moisture, requiring more
burner energy in the drum, he suggests
minimizing moisture in RAP by using
covered stockpiles with a sloped pavement beneath.
New designs of portable and stationary
recycle systems can enhance the costefﬁciency of asphalt plants while furnishing a ﬁnished product that maintains the
high quality of a pure virgin aggregate
mix, but with the cost savings of RAP.
Asphalt Drum Mixers Inc.'s recycle
bins feature a 15-ton capacity and are
continuously welded at the seams. The
bins contain angle irons and midsection
stiffeners for reinforcement, and their
steeply sloped sidewalls prevent material
from plugging or bridging. A tapered discharge opening leads to the direct-drive
belt feeder with a 5-horsepower motor,
multi-ply belt, self-cleaning tail pulley
and adjustable skirt boards.
THAT INTEGRATES WITH YOUR ACCOUNTING SYSTEM.
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Better Roads November 2013 25