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Sound absorption coefficient changes of acoustical plates made of expanded perlite in moist environment

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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 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.

1 Introduction

Perlite which is a siliceous volcanic rock, which expands by ten to thirty times of

its original volume when heated up to 700-1200

O

C. In situ and prefabricated

building materials made of expanded perlite are used widely as thermal

insulation materials. It is used in other industries as filler, filter, abrasive and

moisture retaining material. Expanded perlite, with its open pore structure, is

also very suitable as a sound absorbing material. It is used mostly in spray form

Transactions on the Built Environment vol 69, © 2003 WIT Press, www.witpress.com, ISSN 1743-3509

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