Airborne and impact sound transmission in super-light structures

Publication: Research - peer-reviewArticle in proceedings – Annual report year: 2011

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Super-light structures are newly invented and based on combining lightweight concrete with normal concrete for lighter structures and better structural performance. The overall principle is based on load carrying arches of a normal concrete stabilised and protected from fire by a light-aggregate concrete. A super-light deck element is developed. It is intended to be lighter than traditional deck structures without compromising the acoustic performance. It is primarily the airborne sound insulation, which is of interest as the requirements for the impact sound insulation to a higher degree can be fulfilled by external means such as floorings. The acoustical performance of the slab element is enhanced by several factors. Load carrying internal arches stiffens the element. This causes a decrease in the modal density, which is further improved by the element being lighter. These parameters also contribute to lowering the critical frequency of the element. By introducing light-aggregate concrete into the element, the damping will increase as the internal damping for light-aggregate concrete is higher than for normal concrete. It is also a possibility that the connection between the two materials will increase the damping of the element. It is shown that the weight can be reduced by 10-15% alone from the contribution of the decreased modal density and increased damping. The abovementioned factors are verified experimentally and the contribution of the altered critical frequency will be quantified.
Original languageEnglish
Title of host publicationINTER- NOISE 2011 Proceedings
Publication date2011
StatePublished

Conference

ConferenceINTER-NOISE 2011 : 40th International Congress and Exposition on Noise Control Engineering
Number40
CountryJapan
CityOsaka
Period04/09/1107/09/11

Keywords

  • Super-light structures, Impact sound transmission, Airborne sound transmission
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