Acoustic behavior of porous concreteCharacterization by experimental and inversion methods

  1. M. Pereira
  2. J. Carbajo
  3. L. Godinho
  4. P. Amado-Mendes
  5. D. Mateus
  6. J. Ramis
Journal:
Materiales de construcción

ISSN: 0465-2746

Year of publication: 2019

Volume: 69

Issue: 336

Type: Article

DOI: 10.3989/MC.2019.03619 DIALNET GOOGLE SCHOLAR lock_openOpen access editor

More publications in: Materiales de construcción

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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Funding information

This work was developed within the scope of the POCI-01-0247-FEDER-033990 (iNBRail) Project, funded by FEDER funds through COMPETE 2020, Portugal 2020. This work was also supported by FEDER funds through the Competitivity Factors Operational Programme - COMPETE and by national funds through FCT – Foundation for Science and Technology within the scope of the project POCI-01-0145-FEDER-007633 and through the Regional Operational Programme CENTRO2020 within the scope of the project CENTRO-01-0145-FEDER-000006. The support of COST (European Cooperation in Science and Technology) through the COST Action CA15125 – DENORMS: “Designs for Noise Reducing Materials and Structures” is here also acknowledged.

Funders

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