Acoustic behavior of porous concrete. Characterization by experimental and inversion methods

M. Pereira; J. Carbajo; L. Godinho; P. Amado-Mendes; D. Mateus; J. Ramis

doi:10.3989/mc.2019.03619

Authors

M. Pereira ISISE, Department of Civil Engineering, University of Coimbra https://orcid.org/0000-0003-2229-1825
J. Carbajo Department of Physics, Systems Engineering and Signal Theory, University of Alicante https://orcid.org/0000-0001-6377-5709
L. Godinho ISISE, Department of Civil Engineering, University of Coimbra https://orcid.org/0000-0002-2989-375X
P. Amado-Mendes ISISE, Department of Civil Engineering, University of Coimbra https://orcid.org/0000-0003-2233-2383
D. Mateus ISISE, Department of Civil Engineering, University of Coimbra https://orcid.org/0000-0002-4130-4786
J. Ramis Department of Physics, Systems Engineering and Signal Theory, University of Alicante https://orcid.org/0000-0003-3105-2770

DOI:

https://doi.org/10.3989/mc.2019.03619

Keywords:

Concrete, Aggregate, Mixture proportion, Characterization, Modelization

Abstract

The use of porous concrete solutions with lightweight aggregates has become increasingly common in noise control due to their versatility in exterior and interior applications. In this work, samples of porous consolidated concrete with aggregates of expanded clay were produced, in order to study the influence of the grain size, thickness and water/aggregate/cement ratio on the sound absorption. Experimental techniques were used to obtain the surface impedance and sound absorption coefficient. In addition to experimental characterizations, an inverse method was used (based on a genetic algorithm) to obtain the macroscopic parameters capable of representing the materials studied through the theoretical model of Horoshenkov-Swift. Using the theoretical Horoshenkhov-Swift model it becomes possible to represent these materials in numerical models as equivalent fluids.

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