Speaker
Description
Although being a major component of our debris, both in appropriate disposal sites (i.e. bins, containers, etc.) or in unappropriated ones (streets, beaches, rivers, etc.), there are very few proposals to recycle cigarette butts, so new proposals are welcome. Our research group has been recently studying the use of this residue in the development of acoustical absorbers.
In this work, some studies concerning the mentioned development of these acoustical materials are presented. Acoustical behavior of samples was characterized by the absorption coefficient measured using an impedance tube [Brüel & Kjær Impedance Tube Kit (Type 4206)] with two diameters, 29 mm and 100 mm (providing information in the 500-6400 Hz and 50-1600 Hz ranges, respectively). Measurements (based on the two-microphone transfer-function method) were performed according to the standard procedure detailed in the ISO 10534–2 standards.
Two types of samples were prepared. Firstly, using a certain number of used cigarette butts placed, manually, in the impedance tube holder. Secondly, breaking up previously the used cigarette samples and preparing a sample to be placed in the same holder.
Repeatability of measurements, reproducibility of the preparation of samples, influence on the acoustical behavior of a previous chemical cleaning, influence of breaking-up of the used cigarette butts and influence of compaction of samples will be presented in the poster.
The studies carried out show a very good acoustical behavior in mid and high frequencies of the prepared samples with competitive results in relation to other materials proposed for a similar use.
However, some open questions and further necessary studies are proposed.
| Speaker Country | Spain |
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