Quiet Pavement Pilot Program : Progress Report 3
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2012-09-01
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Edition:Interim report; 2004-2008.
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Abstract:Since 2003, the Arizona Department of Transportation (ADOT) has been conducting a Quiet Pavement
Pilot Program (QPPP) in cooperation with the Federal Highway Administration (FHWA). This report
presents the noise findings of this research through 2007. The initial reduction in noise levels achieved
by overlaying portland cement concrete pavement (PCCP) on freeways in the greater Phoenix area with
asphalt rubber friction course (ARFC) were documented with three types of measurements: 1.)
tire/pavement noise levels measured on-board a test vehicle near a test tire (Site 1), 2.) neighborhood
noise levels measured at typical receiver locations in the vicinity of the freeways (Site 2), and 3.)
wayside tire/pavement noise levels measured at five research grade sites (Site 3). The initial reductions
ranged on average from 5.5 to 9 dB depending on the type of measurement and the specific location. In
subsequent years, measurements were conducted to assess the noise reduction performance of the AFRC
over time or the acoustic longevity of the pavement. For the Site 1 and 3 data, the noise reduction has
dropped by about 2 dB on average over the four years since the overlay was installed while the Site 2
levels have shown less than a 1 dB reduction. The results of the Site 3 measurements were compared to
the results calculated from the FWHA Traffic Noise Model (TNM) using TNM Average Pavement.
Through 2007, the measured noise levels at the tire/pavement interface have been 4 dB or more lower
than the TNM predictions for the 50 ft and 100 ft distant microphone locations except for the 50 ft
position (only) at one of the Site 3 locations.
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