Author(s)

S. Yilmazer

Abstract

Sound absorption coefficient changes of acoustical plates made of expanded perlite in moist environment S .Yilmazer Bilkent University, Department of Interior Architecture and Environmental Design, Bilkent Ankara, Turkey 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 prepare

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