Abstract
In controlling environmental noise, a lot of effort is put in place to optimize noise barriers. However, in doing so, the noise barriers are usually made of materials that are difficult to recycle. Currently, several studies are aimed to use textile-based materials, such as polyester wool instead of mineral wool, in manufacturing noise barriers. However, the pure polyester chip is made of synthesized polymers obtained from petroleum, whose price has risen during the last years. In this work, alternative polyester wool obtained through processing the polyethylene terephthalate (PET) from recycled plastic bottles is presented. For comparison, the sound absorption material characteristic parameters are obtained for pure polyester fiber and the new polyester wool made from recycled plastic bottles. In addition, an empirical model to predict the acoustic behavior of recycled PET is proposed. Thus, the model can be used both to design and to optimize noise barriers.
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