Measurement of pavement absorption using ISO 13472‐2

This paper discusses some recent experience with ISO draft standard 13472‐2 for the measurement of the absorption of pavements. The draft standard is meant to be used for the measurement of the sound absorption coefficient of "reflective" pavements, e.g., pavements of test tracks used for passby noise measurements of vehicles, tires, etc. An impedance tube has been constructed based on the requirements of the draft standard, and the device has been used in the laboratory (with pavement samples) and in situ to measure pavement absorption. The papers discusses these results and other important features of the draft standard including microphone calibration, parasitic tube absorption, and the construction features of the impedance tube and source.