Noise Isolation Capability for a Range of Construction Materials Used In Iraq

This study deals with the ability of noise isolation for some type of concrete block used inIraq. These materials are divided into groups and the noise isolation of these materials is testedby a device made locally. The results of these materials are compared and the followingconclusions are reached: the sound isolation increases generally with the increase of thefrequency, the increase is not linear but vibrated and a relative decrease in the sound insolationis noticed for the frequencies from 2000 Hz to 4000 Hz. The sound isolation increases with theincrease of density of the material and vice versa. The sound isolation increases with theincrease of the thickness if the density is stable. The sound isolation increases with the increaseof the thickness of gap between two layers of a material and the highest value of the loss ofsound transition corresponds a highest value of reducing of noise level. The lowest value of thenoise reduction index corresponds to the lowest value of reducing of noise level. The mosteffective materials in reducing noise of the materials tested in this research are the solidconcrete block to which a layer of Sandwich panel is added. The error percentage was less than10%, particularly at the frequencies less than 1000 Hz.