Development of an Eco-Acoustic Absorber Based on Local Recycled Granular Materials
AbstractEnhancing the acoustic absorption performance across a wide frequency band can be processed through improving the selection of raw materials. In the field of acoustics, there is a growing shift towards eco-friendly resources to mitigate environmental and economic impacts. The use of recycled granular materials of local origin requires special attention to the granulometry and the optimal combinations of grain sizes. This study focuses on two key aspects: investigating the consolidation of granules as well as creating and testing monodispersed and bi-dispersed granular test specimens using different proportions of granules. The diameter range of particles is fixed between 250 μm and 2 mm. The properties of the samples are characterized using direct measurement methods, which enables the assessment of various properties such as porosity, resistivity, bulk density and absorption coefficient. The results show promising improvements in acoustic absorption performance, with the exception of anti-resonant dips. To remedy these dips and achieve broadband absorption, an experimental approach is proposed where the relationship between resistivity ratios, cementitious binder content and particle diameters are optimized. This approach aims to fine-tune the parameters and achieve a more balanced acoustic absorption profile.Keywords: sound absorption, granular material, recycled material, eco-friendly material, granulometry, experimental approach, material properties.
How to Cite
Copyright on articles is held by the author(s). The corresponding author has the right to grant on behalf of all authors and does grant on behalf of all authors, a worldwide exclusive licence (or non-exclusive license for government employees) to the Publishers and its licensees in perpetuity, in all forms, formats and media (whether known now or created in the future)
i) to publish, reproduce, distribute, display and store the Contribution;
ii) to translate the Contribution into other languages, create adaptations, reprints, include within collections and create summaries, extracts and/or, abstracts of the Contribution;
iii) to exploit all subsidiary rights in the Contribution,
iv) to provide the inclusion of electronic links from the Contribution to third party material where-ever it may be located;
v) to licence any third party to do any or all of the above.