RoadScience
6 July 2014 Better Roads
for approximately 3.8 miles, consisted of overlay of three
to four lanes of the existing plain-jointed portland cement
concrete pavement roadway in each direction with SMA from
Austin Avenue to Kostner Avenue, and from Homan Avenue to
Sacramento Boulevard.
The conventional diamond grinding was used to retex-
ture the existing continuous reinforced concrete pavement
between Kostner and Homan avenues. This diamond grinding
was done by a joint venture of Quality Saw and Seal Inc., and
Safety Grooving and Grinding.
Shortly after completion of the diamond grinding, the
project was evaluated for tire/pavement noise using an
on-board sound intensity noise measurement device. The
diamond-ground and SMA surfaces were comparable in noise
level, with the diamond-ground registering at 103.7 dBA
and the SMA at 103.4 dBA. (For the article, "IGGA: Agencies
specifying diamond saw-cut textures to solve smoothness,
noise and safety issues," in Better Roads, go to betterroads.com/
igga-agencies-specifying-diamond-saw-cut-textures-to-solve-smoothness-
noise-and-safety-issues.)
The diamond grinding on this project received an award
for its ride quality, which prompted IGGA to conduct profile
testing of both the SMA and diamond-ground surfaces to
compare ride characteristics.
The Ames Engineering profile van measured the profile in
each wheel path simultaneously. Two RoLine sensors were
Closely spaced diamond-coated circular saw blades are at the heart of this
self-propelled grooving/grinding machine.
Photo
courtesy
of
International
Grooving
and
Grinding
Association
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