What is it about?
i) Three methods (in-lab Kundt tube, on-site Kundt tube, Adrienne device) for assessing the acoustic absorption of a pavement were compared. ii) New objective functions to fit observed data and model were set up. iii) Boundary conditions were attentively investigated and experimental data were used. iv) The precision and the accuracy of each device were studied.
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Why is it important?
Road pavements where the wearing course is in porous asphalt concrete, must provide high sound absorption as well as water high runoff capacity. These properties lead to reduce traffic noise and avoid incident caused by aquaplaning.
Perspectives
Based on results, when fitting experimental data through theoretical models the least square method is unsatisfactory and alternative algorithms are proposed. The on-site Adrienne method provides a good estimate of thickness, tortuosity, resistivity and maximum, while in-lab impedance tube, even if quite time consuming, seems to achieve the best accuracy. The on-site Kundt tube provides a satisfactory estimate of porosity and further investigations and analyses are recommended to investigate its use also for porous surfaces. Future research will address two competing needs which emerged from the study: i) the need for simplifying the procedures/methods; ii) the need for improving the quantity of information gathered (e.g., texture), through the same device.
PhD Rosario Fedele
Universita degli Studi Mediterranea di Reggio Calabria
Read the Original
This page is a summary of: Significance and reliability of absorption spectra of quiet pavements, Construction and Building Materials, June 2017, Elsevier,
DOI: 10.1016/j.conbuildmat.2017.02.130.
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