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      • Department of Interior Architecture and Environmental Design
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      Sound absorption coefficient changes of acoustical plates made of expanded perlite in moist environment

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      Author(s)
      Yılmazer, Semiha
      Date
      2003
      Source Title
      WIT Transactions on The Built Environment
      Print ISSN
      1743-3509
      Publisher
      WITPress
      Volume
      69
      Pages
      201 - 210
      Language
      English
      Type
      Article
      Item Usage Stats
      102
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      Abstract
      Expanded perlite is a porous, lightweight, fire resistant and moisture retaining material with sound and thermal insulation properties. In this research, acoustical behaviour of plates made of expanded perlite was studied experimentally. Since these plates are used for sound absorption the acoustical parameter selected for this study is "sound absorption coefficient". Preliminary experiments indicated that moisture reduced the sound absorption coefficient on plates and there is not much significant difference between the dry and 50% humid conditions. However, there is a significant difference in acoustical properties for the 50% - 95% humid conditions. Thus, this interval was studied in detail. A number of expanded perlite plates having different mixtures were prepared and tested. It was observed that coating of expanded perlite particles with sodium silicate increased moisture resistance, and that the addition of mineral fibre into the mixtures increased the strength and sound absorption coefficient of the plates.
      Keywords
      Absorption
      Fibers
      Fire resistance
      Mixtures
      Moisture
      Plates (structural components)
      Porous materials
      Thermal insulation
      Acoustical plates
      Moist environment
      Pertile
      Sound absorption
      Acoustic waves
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      http://hdl.handle.net/11693/27487
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      • Department of Interior Architecture and Environmental Design 209
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