The Acoustic Performance of Expanded Perlite Composites Reinforced with Rapeseed Waste and Natural Polymers

Silviu Nastac, Petronela Nechita, Carmen Debeleac, Cristian Simionescu and Mihai Seciureanu
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Silviu Nastac: Research Center for Mechanics of Machines and Technological Equipments, Engineering and Agronomy Faculty, “Dunarea de Jos” University of Galati, 810017 Braila, Romania
Petronela Nechita: Research and Consultancy Center for Agronomy and Environment, Engineering and Agronomy Faculty, “Dunarea de Jos” University of Galati, 810017 Braila, Romania
Carmen Debeleac: Research Center for Mechanics of Machines and Technological Equipments, Engineering and Agronomy Faculty, “Dunarea de Jos” University of Galati, 810017 Braila, Romania
Cristian Simionescu: Research and Consultancy Center for Agronomy and Environment, Engineering and Agronomy Faculty, “Dunarea de Jos” University of Galati, 810017 Braila, Romania
Mihai Seciureanu: Research Center for Mechanics of Machines and Technological Equipments, Engineering and Agronomy Faculty, “Dunarea de Jos” University of Galati, 810017 Braila, Romania

Sustainability, 2021, vol. 14, issue 1, 1-17

Abstract: Lignocelluloses residues from the post-harvest crop are receiving great scientific attention nowadays. Generally, the composite materials based on lignocelluloses waste present low density and weight, and better insulation properties compared with those petroleum-based. This study presents the results of experimental investigations regarding soundproofing capabilities for a composite material based on expanded perlite (EP) and natural polymers matrix (starch) reinforced with rapeseed stalks waste. The preparation of light-weight samples of composites was performed at room temperature through a mechanical mixing process of EP with starch polymers and rapeseed residues until optimum moisture content composition was obtained. Rapeseed stalks long fibers were avoided through the preliminary dry grinding procedure, and the composite was air-dried at room temperature for 48 h. Four samples of composites with different ratio of EP and rapeseed waste were considered. The evaluation of sample sound insulation characteristics was performed using the transfer-matrix method based on a four-microphone acoustic impedance tube. The paper concludes that the proposed composite provides comparative sound insulation capabilities to actual materials, with few particular aspects presented within the paper. Thus, these new materials are promising as a viable alternative to the actual large-scale utilization solutions in soundproofing applications.

Keywords: lignocelluloses waste; rapeseed stalks; expanded perlite; starch; composites; sound absorption; sound transmission loss; noise reduction coefficient (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2021
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Persistent link: https://EconPapers.repec.org/RePEc:gam:jsusta:v:14:y:2021:i:1:p:103-:d:709109

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