Development of an Eco-Acoustic Absorber Based on Local Recycled Granular Materials
Résumé
Enhancing 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.
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