Acoustical characteristic of empty fruit bunch (EFB) fibre with influence of sodium hydroxide treatment time and decay lifespan

Research on natural fibres has gain much interest in recent years due to the sustaibability and avaibility in which demand for green renewable reinforced composites. Natural fibres can be considered as the alternative way to replace the synthetic fibre as well as to implement the sustainability o...

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Main Author:	Mat Wan, Lauren
Format:	Thesis
Language:	English English English
Published:	2019
Subjects:	QC221-246 Acoustics Sound
Online Access:	http://eprints.uthm.edu.my/543/1/24p%20LAUREN%20MAT%20WAN.pdf http://eprints.uthm.edu.my/543/2/LAUREN%20MAT%20WAN%20COPYRIGHT%20DECLARATION.pdf http://eprints.uthm.edu.my/543/3/LAUREN%20MAT%20WAN%20WATERMARK.pdf
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spelling	my-uthm-ep.5432021-08-05T03:15:29Z Acoustical characteristic of empty fruit bunch (EFB) fibre with influence of sodium hydroxide treatment time and decay lifespan 2019-08 Mat Wan, Lauren QC221-246 Acoustics. Sound Research on natural fibres has gain much interest in recent years due to the sustaibability and avaibility in which demand for green renewable reinforced composites. Natural fibres can be considered as the alternative way to replace the synthetic fibre as well as to implement the sustainability of the materials. However, the natural fibre also has its own disadvantage which is the ability to maintain the quality of absorption due to the lack of information and research on the acoustic application. Thus, in this research, the untreated and treated Empty Fruit Bunch (EFB) fibre was investigated as control unit and the standard used for sound absorption test was ISO 10534-2 and ASTM E1050-98. The EFB has undergone a chemical modification process known as alkali treatment using sodium hydroxide (NaOH). Five parameters were chosen for the alkali treatment process which is the fiber immersion time (at 1 hour until 5 hours) with fixed alkali treatment concentration of 6% NaOH. Cross sectional area of the fibre was measured using Leica stereo video analyser. The results from the test show EFB fibre gives positive value of sound absorption from mid to high frequency which is from 2000 Hz to 5000 Hz. The best sound absorption is performed by the 1 hour of treated fibre with a maximum sound absorption coefficient (α) nearly 1 at 2500 Hz and with thickness of 50 mm. The Noise Reduction Coefficient (NRC) for the 1 hour treated fibre is 0.53. As for decay lifespan, the sound absorptions performance was slightly decreased from 0.68 to 0.55 within 5 to 20 months. This result indicates that the treated EFB are highly absorptive material and it is recommended to become as a natural base for acoustical absorption material. 2019-08 Thesis http://eprints.uthm.edu.my/543/ http://eprints.uthm.edu.my/543/1/24p%20LAUREN%20MAT%20WAN.pdf text en public http://eprints.uthm.edu.my/543/2/LAUREN%20MAT%20WAN%20COPYRIGHT%20DECLARATION.pdf text en staffonly http://eprints.uthm.edu.my/543/3/LAUREN%20MAT%20WAN%20WATERMARK.pdf text en validuser mphil masters Universiti Tun Hussein Onn Malaysia Fakulti Kejuruteraan Mekanikal dan Pembuatan
institution	Universiti Tun Hussein Onn Malaysia
collection	UTHM Institutional Repository
language	English English English
topic	QC221-246 Acoustics Sound
spellingShingle	QC221-246 Acoustics Sound Mat Wan, Lauren Acoustical characteristic of empty fruit bunch (EFB) fibre with influence of sodium hydroxide treatment time and decay lifespan
description	Research on natural fibres has gain much interest in recent years due to the sustaibability and avaibility in which demand for green renewable reinforced composites. Natural fibres can be considered as the alternative way to replace the synthetic fibre as well as to implement the sustainability of the materials. However, the natural fibre also has its own disadvantage which is the ability to maintain the quality of absorption due to the lack of information and research on the acoustic application. Thus, in this research, the untreated and treated Empty Fruit Bunch (EFB) fibre was investigated as control unit and the standard used for sound absorption test was ISO 10534-2 and ASTM E1050-98. The EFB has undergone a chemical modification process known as alkali treatment using sodium hydroxide (NaOH). Five parameters were chosen for the alkali treatment process which is the fiber immersion time (at 1 hour until 5 hours) with fixed alkali treatment concentration of 6% NaOH. Cross sectional area of the fibre was measured using Leica stereo video analyser. The results from the test show EFB fibre gives positive value of sound absorption from mid to high frequency which is from 2000 Hz to 5000 Hz. The best sound absorption is performed by the 1 hour of treated fibre with a maximum sound absorption coefficient (α) nearly 1 at 2500 Hz and with thickness of 50 mm. The Noise Reduction Coefficient (NRC) for the 1 hour treated fibre is 0.53. As for decay lifespan, the sound absorptions performance was slightly decreased from 0.68 to 0.55 within 5 to 20 months. This result indicates that the treated EFB are highly absorptive material and it is recommended to become as a natural base for acoustical absorption material.
format	Thesis
qualification_name	Master of Philosophy (M.Phil.)
qualification_level	Master's degree
author	Mat Wan, Lauren
author_facet	Mat Wan, Lauren
author_sort	Mat Wan, Lauren
title	Acoustical characteristic of empty fruit bunch (EFB) fibre with influence of sodium hydroxide treatment time and decay lifespan
title_short	Acoustical characteristic of empty fruit bunch (EFB) fibre with influence of sodium hydroxide treatment time and decay lifespan
title_full	Acoustical characteristic of empty fruit bunch (EFB) fibre with influence of sodium hydroxide treatment time and decay lifespan
title_fullStr	Acoustical characteristic of empty fruit bunch (EFB) fibre with influence of sodium hydroxide treatment time and decay lifespan
title_full_unstemmed	Acoustical characteristic of empty fruit bunch (EFB) fibre with influence of sodium hydroxide treatment time and decay lifespan
title_sort	acoustical characteristic of empty fruit bunch (efb) fibre with influence of sodium hydroxide treatment time and decay lifespan
granting_institution	Universiti Tun Hussein Onn Malaysia
granting_department	Fakulti Kejuruteraan Mekanikal dan Pembuatan
publishDate	2019
url	http://eprints.uthm.edu.my/543/1/24p%20LAUREN%20MAT%20WAN.pdf http://eprints.uthm.edu.my/543/2/LAUREN%20MAT%20WAN%20COPYRIGHT%20DECLARATION.pdf http://eprints.uthm.edu.my/543/3/LAUREN%20MAT%20WAN%20WATERMARK.pdf
_version_	1747830634883055616

Acoustical characteristic of empty fruit bunch (EFB) fibre with influence of sodium hydroxide treatment time and decay lifespan

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