According to the ASTM definition, asphalt rubber (AR) is "a
blend of asphalt cement, reclaimed tire rubber, and certain additives in
which the rubber component is at least 15 percent by weight of the total
blend and has reacted in the hot asphalt cement sufficiently to cause
swelling of the rubber particles." By definition, asphalt rubber is
typically prepared using the "wet process." The asphalt rubber is produced at
elevated temperatures under high agitation to promote the physical
interaction of the asphalt binder and rubber constituents, and to keep
the rubber particles suspended in the blend.
This is the way Rubber Asphalt has been produced for over 25 years. The
end is a great product, but it is very costly to produce because of the
expensive blending equipment it takes for this "wet process". The
blending equipment can cost close to one million dollars. The product of
the "wet process" is sticky, hard to place, and hard to handle. Plus,
the modified oil has a very small window to use it.
We at RAS, have solved all the problems of the "wet process" and keep
all the benefits of Rubber Asphalt.