Noise Isolation Capability for a Range of Construction Materials Used In Iraq
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Abstract
This study deals with the ability of noise isolation for some type of concrete block used in
Iraq. These materials are divided into groups and the noise isolation of these materials is tested
by a device made locally. The results of these materials are compared and the following
conclusions are reached: the sound isolation increases generally with the increase of the
frequency, the increase is not linear but vibrated and a relative decrease in the sound insolation
is noticed for the frequencies from 2000 Hz to 4000 Hz. The sound isolation increases with the
increase of density of the material and vice versa. The sound isolation increases with the
increase of the thickness if the density is stable. The sound isolation increases with the increase
of the thickness of gap between two layers of a material and the highest value of the loss of
sound transition corresponds a highest value of reducing of noise level. The lowest value of the
noise reduction index corresponds to the lowest value of reducing of noise level. The most
effective materials in reducing noise of the materials tested in this research are the solid
concrete block to which a layer of Sandwich panel is added. The error percentage was less than
10%, particularly at the frequencies less than 1000 Hz.
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