Better Roads November 2014 29
grinding the surface improved its over-
all smoothness.
Bridge repair work, including the
epoxy chip seal, is expected to add 12
to 15 years to the life of the structure,
according to Steinback.
"The process of grinding bridges and
applying an epoxy chip seal wearing
course is a fast and easy way to extend
the life of bridges," says Rory Heizel-
man, project engineer at SDDOT. "In
South Dakota, this repair method has
been seeing increased use in the past
few years. It also has a lesser impact on
the traveling public than some other
repair methods."
Getting the job done
Considering that a full size Target Model
PR 3800 grinder was used on the bridg-
es, navigating the road's narrow lanes,
elevation gain and tight curves was a
challenge. All road repair equipment
also had to be kept out of the state and
national parks, so bypass routes were all
that were available for crew to use.
"The grinder was too heavy to be
trucked up the narrow mountain road.
Accompanied by cars in front and be-
hind, the grinder had to be driven – at a
maximum speed of 50 feet per minute
– up to the bridge locations," said Dan
Stoltenberg, the grinding division man-
ager at Diamond Surface Inc. This meant
unloading the equipment as much as 2
miles away from the site of the grinding.
Working on the narrow roads was
also tricky. Two grinder operators were
required in order to control the ac-
curacy of the grinding process. The
regular grinding machine was unable to
maintain blade contact in areas near the
bridge where the turning radius was
tight and its use would have resulted in
a gap of several inches along the turns.
In these areas the Diamond Surface, Inc.
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