Acoustic Properties of Sustainable Concrete Materials
Summary
Concrete remains the most ubiquitous structural material worldwide, and its acoustic behaviour is increasingly under scrutiny as urbanisation heightens noise pollution. Sustainable variants of traditional concrete—incorporating industrial by-products such as fly ash cenospheres, recycled rubber granulate or lightweight aggregates—offer dual benefits of waste valorisation and enhanced acoustic performance. The key to noise mitigation lies in the interplay of density, pore architecture and internal connectivity: low-density, highly porous matrices attenuate airborne noise through viscous and thermal dissipation, while denser mixtures reflect sound and can serve as barriers. Recent advances have shown that tailoring aggregate size distributions and incorporating polymeric or mineral waste can significantly improve sound absorption coefficients over a broad frequency range, without unduly compromising mechanical integrity. Practical applications span road and rail noise barriers, interior acoustic panels and subfloor systems, underscoring the global significance of sustainable concrete acoustics for health, comfort and regulatory compliance. Interdisciplinary research continues to refine mix design, pore morphology and surface treatments, pointing the way towards next-generation eco-friendly materials with optimised acoustic profiles.
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Acoustic Properties of Sustainable Concrete Materials publication trend
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Technical terms
Sound absorption coefficient: A measure of the proportion of incident sound energy absorbed by a material, expressed as a value between 0 and 1.
Porosity: Fraction of void space in a material affecting its acoustic performance through energy dissipation and airflow resistance.
Cenospheres: Hollow spherical particles derived from fly ash that reduce density and enhance sound absorption in concrete composites.
Lightweight aggregates: Low-density filler materials, such as expanded clay or recycled rubber, employed to introduce porosity and improve acoustic insulation.
Airborne noise transmission loss: The reduction in sound level as noise travels through a barrier, indicating its insulating capacity.
References
- Preparation and sound absorption performance of low‐carbon fly ash cenosphere plates. International Journal of Ceramic Engineering & Science (2024).
- Acoustic Assessment of Multiscale Porous Lime-Cement Mortars. Materials (2022).
- Sound-Absorbing and Thermal-Insulating Properties of Cement Composite Based on Recycled Rubber from Waste Tires. Applied Sciences (2021).
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