Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Influence of the porosity on the sound transmission loss of light weight concrete materials
The Sound Transmission Loss (STL) of Autoclaved Aerated Concrete (AAC) materials computed with an isotropic elastic model is usually underestimated by 5 to 8dB in the low frequency range (50-400 Hz). A better approximation of AAC STL can be achieved by using a model that also takes into account the porous characteristics of the material. By using the Biot- Johnson-Champoux-Allard poro-elastic model and the transfer matrix method, the STL of a 100 mm thick AAC wall has been computed and compared to actual laboratory test reports. The contributions and the effects of the five acoustical parameters used in the poro-elastic model (flow resistivity, porosity, tortuosity, thermal and viscous characteristic lengths) have been investigated by studying the analysis of the STL variance of a 25 factorial plan. The flow resistivity and the porosity were found to influence the most the AAC STL. A regression model has been built and shows that the maximum AAC STL is obtained when the value of the static airflow resistivity is low and the porosity is high. The poro-elastic model developed by the authors for this study was finally used to compute the STL of AAC composite wall systems. Effect of plaster daubing and plasterboards finishes on AAC STL performance has been studied and alternative AAC wall systems are proposed to improve STL performance in the low frequency range.
Influence of the porosity on the sound transmission loss of light weight concrete materials
The Sound Transmission Loss (STL) of Autoclaved Aerated Concrete (AAC) materials computed with an isotropic elastic model is usually underestimated by 5 to 8dB in the low frequency range (50-400 Hz). A better approximation of AAC STL can be achieved by using a model that also takes into account the porous characteristics of the material. By using the Biot- Johnson-Champoux-Allard poro-elastic model and the transfer matrix method, the STL of a 100 mm thick AAC wall has been computed and compared to actual laboratory test reports. The contributions and the effects of the five acoustical parameters used in the poro-elastic model (flow resistivity, porosity, tortuosity, thermal and viscous characteristic lengths) have been investigated by studying the analysis of the STL variance of a 25 factorial plan. The flow resistivity and the porosity were found to influence the most the AAC STL. A regression model has been built and shows that the maximum AAC STL is obtained when the value of the static airflow resistivity is low and the porosity is high. The poro-elastic model developed by the authors for this study was finally used to compute the STL of AAC composite wall systems. Effect of plaster daubing and plasterboards finishes on AAC STL performance has been studied and alternative AAC wall systems are proposed to improve STL performance in the low frequency range.
Influence of the porosity on the sound transmission loss of light weight concrete materials
Einfluss der Porosität auf den Schallübertragungsverlust von Leichtbeton
Delas, Olivier (Autor:in) / Jaouen, Luc (Autor:in) / Becot, Francois-Xavier (Autor:in)
2009
9 Seiten, 8 Bilder, 6 Tabellen, 14 Quellen
Aufsatz (Konferenz)
Englisch
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