Acoustical absorption coefficients of more than 140 pavement cores were obtained by the impedance tube method with two microphones and cross-spectral analyses. The effectiveness of the impedance tube in predicting noise reduction for different mixes was evaluated by comparing the correlations between onboard sound intensity levels and absorption. Theoretical predictions of acoustical absorption due to friction between air and porous matrix and thermal relaxation were compared with measured results for an idealized porous structure. The model was used to infer porosity, tortuosity, and pore size from measured acoustical absorption spectra for manufactured porous asphalt and extrapolate test results to nonnormal angles of incidence, assuming isotropy of the porous structure. This model will help improve mix designs to increase the absorption of pavement surfaces and can be used to estimate porous pavement properties.


    Access

    Download

    Check availability in my library

    Order at Subito €


    Export, share and cite



    Title :

    Acoustical Absorption of Porous Pavement


    Additional title:

    Transportation Research Record


    Contributors:


    Publication date :

    2008-01-01




    Type of media :

    Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    English



    Acoustical Absorption of Porous Pavement

    Nelson, James T. | Online Contents | 2008


    Acoustical diagnoses of porous drainage pavements

    Iwase, Teruo / Kazama, Kaoru / Ishikawa, Kenichi et al. | Tema Archive | 2009


    Application of nearfield acoustical holography to tire/pavement interaction noise emissions

    Ruhala,R.J. / Burroughs,C.B. / Pennsilvania State Univ.,US | Automotive engineering | 1997


    Application of Nearfield Acoustical Holography to Tire/Pavement Interation Noise Emissions

    Burroughs, Courtney B. / Ruhala, Richard J. | SAE Technical Papers | 1997


    Application of Nearfield Acoustical Holography to Tire/Pavement Interation Noise Emissions

    Ruhala, R. J. / Burroughs, C. B. / Society of Automotive Engineers | British Library Conference Proceedings | 1997