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Noise measurements of highway pavements in Texas.
  • Published Date:
    2009-10-01
  • Language:
    English
Filetype[PDF-3.88 MB]


Details:
  • Publication/ Report Number:
    FHWA/TX-10/0-5185-3
  • Resource Type:
  • Geographical Coverage:
  • NTL Classification:
    NTL-HIGHWAY/ROAD TRANSPORTATION-Materials ; NTL-HIGHWAY/ROAD TRANSPORTATION-Pavement Management and Performance ;
  • Format:
  • Abstract:
    This report presents the results of noise testing performed on Texas pavements between May of 2006 and the

    summer of 2008. Two field test methodologies were used: roadside noise measurement with SPL meters and onvehicle

    sound intensity measurement of noise at the tire/pavement interface. Additionally, pavement samples

    were tested in an impedance tube. Comparisons are made between the levels of vehicular noise at the roadside

    and directly on the source vehicle. The FHWA Traffic Noise Model (TNM) computer program was used to

    predict the noise levels at roadside based on the observed traffic and geometry of the roadway, and subsequently

    compared to the noise as actually measured with precision test equipment. An important part of the study focused

    on testing pavements corresponding to the New Generation Open Graded Friction Course type, a permeable

    asphalt design with air voids in the area of 17 percent, also known as Permeable Friction Course (PFC) in Texas.

    Findings indicate that roadside noise levels experienced along PFC pavements are significantly lower than

    predicted by TNM using either the "Average" or "Open Graded" pavement models included in the program.

    Measurements at the tire/pavement interface confirm the quieter characteristics of these surfaces. The study

    results also suggest a slight degradation of such quietness with time, but even with this small increase in noise

    levels the surfaces can still be considered quieter than other pavement types. Furthermore, the increase in

    loudness is not significant enough to assert that these PFC surfaces cannot retain their acoustic properties over

    time. As per the results obtained in this study, it can be said that open-graded pavements can be reliably used for

    noise impact avoidance and abatement.

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