Abstract
In order to contribute to the solution of the environmental problem created by the tire wasteways, the possibilities of using rubber crumbs of waste tires as acoustic absorbent materials have been studied in a systematic way. Experimental absorption coefficients of rubber crumb granulates with mesh diameters between 1.4 and 7 mm have been tested in Kundt’s tube and in a reverberation room. Absorption coefficient values so obtained are compared with computational values afforded through mathematical prediction models that use the intrinsical parameters of porous material such as porosity, tortuosity, and flow resistivity, which were measured on layers of the respective materials. The good broadband acoustic absorption of the material encourages its use as an alternative to the current absorbent acoustic screens, used for the protection against traffic noise.
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