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Research on Airborne Sound Insulation Performance of Lightweight Steel Gauge and Lightweight Concrete Partition Wall

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To investigate the airborne sound insulation properties of lightweight steel gauge and lightweight concrete partition wall, we have measured different configurations of walls in CABR Acoustics Laboratory in accordance with ISO 10140-2:2010. The basic structure consists of lightweight steel gauge, fiber cement panels mounted on each side as permanent formwork, and cast-in-place lightweight concrete of different thickness and density. Test results show that sound reduction index of walls with and without concrete casting differs greatly in frequency characteristic, and increment of concrete density provides a better improvement in sound insulation than that of thickness. Then we attached plasterboards on both sides of walls therein and got diverse results. For lighter walls, additional plasterboards contribute to better sound insulation, while for heavier walls, weighted sound reduction index decreases due to resonance of plasterboards. Finally, we measured multilayer walls of heavy-heavy, heavy-light and heavy-light-heavy structure, where heavy and light mean cavity filled with concrete and mineral wool respectively. Multilayer structure is a good way to improve sound insulation, but symmetrical configuration should be avoided to prevent overlap and magnification of acoustics defects.

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Document Type: Research Article

Publication date: 21 August 2016

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