Sound absorbing and insulating properties of natural fiber hybrid composites using sugarcane bagasse and bamboo charcoal

Meseret Bogale,Yohaness Admassu,Fasika Abedom,Gedamnesh Getahun,Eshetu Solomon,Mekdes Gedilu,Alemu Aduna,Selvaraj Senthil Kumar,Santhanam Sakthivel

doi:10.1177/15589250211044818

Abstract

This research paper reports a study on thermal and sound insulation samples developed from sugarcane bagasse and bamboo charcoal for automotive industry applications. The sugarcane bagasse and bamboo charcoal fiber is a potential source of raw material that can be considered for thermal and sound insulation applications. Natural fibers are commonly used in diverse applications and one of the most important applications is sound absorption. Natural fiber hybrid composite currently is in greater demand in industries because of their advantages such as low cost, biodegradability, acceptable physical properties, and so on. Eco-friendly sound-absorbing composite materials have been developed using bamboo charcoal and sugarcane bagasse fibers. From these fibers five types of natural fiber green composite were developed using the compression bonding technique. The natural composite noise control performance contributes to its wider adoption as sound absorbers. The sound absorption coefficient was measured according to ASTM E 1050 by the Impedance tube method. The physical properties of natural fiber composites such as thickness, density, porosity, air permeability, and thermal conductivity were analyzed for all samples in accordance with ASTM Standard. The result exposed that natural fiber green composite were absorbing the sound resistance of more than 70% and the natural fibers composites provide the best acoustic absorption properties, these composite materials have adequate moisture resistance at high humidity conditions without affecting the insulation and acoustic properties.

Highlights

Fibers have been natural fibers end-of-life textiles and made into textile products which have become a well-proven and effective way of processing
The developed sample composite materials that can be applied in buildings as filling and facing insulation materials, structural and insulation materials made of natural resources ensure full and active “breathing” of the whole structure element giving users a real feeling of building and automotive comfort
The sugarcane bagasse waste fiber is collected from streets and chemically treated by submerging them in 500 ml with an alkaline solution of 10% NaOH at 60%–70% for 3 h as similar work is done by Braccesi and Bracciali.[10]

Summary

Introduction

Fibers have been natural fibers end-of-life textiles and made into textile products which have become a well-proven and effective way of processing. Noise control applications of natural fiber composite materials include wall cladding, acoustic barriers and acoustic ceilings, passenger vehicle noise absorbers, and various others.[4] The developed sample composite materials that can be applied in buildings as filling and facing insulation materials, structural and insulation materials made of natural resources (e.g. waste sugar cane bagasse fibers and bamboo charcoal) ensure full and active “breathing” of the whole structure element giving users a real feeling of building and automotive comfort. The sound absorption influencing factors such as thickness, density, air permeability, porosity, and thermal conductivity was measured according to the ASTM Standard and the purpose of automotive industry applications

Objectives

Methods

Results

Conclusion