Influence of Spheroid and Fiber-Like Waste-Tire Rubbers on the Sound Absorption Coefficient of Rubberized Mortars

Abstract:

We study the sound absorption coefficient of rubberized mortars in response to the incorporation of 7.5%, 15% and 30% of waste-tire rubbers in place of sand at a water-to-cement mass (w/c) ratio of 0.48. We consider two different morphologies of rubber particles, namely spheroid (S) and fiber-like (F) particles. Experimental characterization was performed after 7 days of curing. The mixtures were performed by density, water absorption, void index and sound absorption. We choose the transfer function method with one microphone successively in two locations in order to obtain the sound absorption coefficient using an impedance tube. Sound absorption coefficient results indicate a slightly enhancement for 7.5% S, 15% S, 30% S and 7.5% F mixtures from 1600 Hz to 2000 Hz. The best acoustic performance is observed for 30% S and 7.5% F mixtures from 850 Hz to 2000 Hz.

• Periodical: Materials Science Forum (Volume 958)
• Pages: 63-68
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.958.63
• Online since: June 2019
• Authors: Edson Jansen Pedrosa Miranda Jr.*, Andressa Fernanda Angelin, Samuel Rodrigues, Luísa Andréia Gachet-Barbosa, J.M.C. dos Santos
• Keywords: Alternative Materials, Rubberized Mortar, Sound Absorption Coefficient, Waste-Tire Rubber

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