The spring back effect of oil palm empty fruit bunch fibre on physical and mechanical properties of cement board

The inclusion of oil palm empty fruit bunch fibre (EFB) in cement board has promoted the internal stress development called spring back (SpB). Theoretically SpB has increased the thickness and decreases the density of the sample, and eventually decline the physical and mechanical properties of empty...

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Main Author:	Nik Soh, Nik Mohd Zaini
Format:	Thesis
Language:	English English English
Published:	2022
Subjects:	TJ Mechanical engineering and machinery
Online Access:	http://eprints.uthm.edu.my/8456/1/24p%20NIK%20MOHD%20ZAINI%20NIK%20SOH.pdf http://eprints.uthm.edu.my/8456/2/NIK%20MOHD%20ZAINI%20NIK%20SOH%20COPYRIGHT%20DECLARATION.pdf http://eprints.uthm.edu.my/8456/3/NIK%20MOHD%20ZAINI%20NIK%20SOH%20WATERMARK.pdf
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spelling	my-uthm-ep.84562023-02-27T02:34:46Z The spring back effect of oil palm empty fruit bunch fibre on physical and mechanical properties of cement board 2022-07 Nik Soh, Nik Mohd Zaini TJ Mechanical engineering and machinery The inclusion of oil palm empty fruit bunch fibre (EFB) in cement board has promoted the internal stress development called spring back (SpB). Theoretically SpB has increased the thickness and decreases the density of the sample, and eventually decline the physical and mechanical properties of empty fruit bunch cement board (EFBCB). The main factors that have identified to contribute SpB are the length of fibres used, the ratio of cement to fibres and incompatibility between fibres and cement. Hence, this study was conducted to propose an effective approach to mitigate the effect of SpB on EFBCB samples to expedite corrective action especially along curing period. Three groups of samples namely EFB length, cement-EFB ratio and percentage NaOH concentration for EFB treatment were prepared, where each of design mixed consists of 5 repeated samples. Modulus of elasticity (MOE), modulus of rupture (MOR), internal bonding (IB) and thickness swelling (TS) are the properties that were investigated for EFBCB sample. The results revealed that combination EFB length of 16% of 25.72 mm, 64% of 14.37 mm and 20% of 4.32 mm with cement to EFB ratio of 3:1 and 3% NaOH concentration for EFB treatment has yielded optimum physical and mechanical properties. This combination has significantly diminished the SpB effect and produced MOE, MOR, IB, and TS values of 6098 N/mm2, 11.92 N/mm2, 0.53 N/mm2, and 1.22%, respectively. On top of that, the linear regression prediction model based on cement to EFB ratio and percentage of NaOH concentration for EFB treatment discovered that the maximum percentage of thickness increment due to SpB is found to be limited to 3.2% or 0.4 mm in sustaining the standard requirement. Therefore, the limit of percentage thickness increment (3.2%) has been incorporated in new laboratory technique to mitigate the SpB effect of EFB on EFBCB sample. Thus, the corrective measures can be done as early as day 2 to day 15 during the curing period for the samples with a thickness exceeding 12.4 mm (3.2% of design thickness). It can be concluded that, the reduction in thickness increment due to SpB significantly improve the performance of EFBCB samples as well as failed of EFBCB samples can be identified as earlier as during curing period purposely for design mix correction. 2022-07 Thesis http://eprints.uthm.edu.my/8456/ http://eprints.uthm.edu.my/8456/1/24p%20NIK%20MOHD%20ZAINI%20NIK%20SOH.pdf text en public http://eprints.uthm.edu.my/8456/2/NIK%20MOHD%20ZAINI%20NIK%20SOH%20COPYRIGHT%20DECLARATION.pdf text en staffonly http://eprints.uthm.edu.my/8456/3/NIK%20MOHD%20ZAINI%20NIK%20SOH%20WATERMARK.pdf text en validuser phd doctoral Universiti Tun Hussein Onn Malaysia Fakulti Kejuruteraan Awam dan Alam Bina
institution	Universiti Tun Hussein Onn Malaysia
collection	UTHM Institutional Repository
language	English English English
topic	TJ Mechanical engineering and machinery
spellingShingle	TJ Mechanical engineering and machinery Nik Soh, Nik Mohd Zaini The spring back effect of oil palm empty fruit bunch fibre on physical and mechanical properties of cement board
description	The inclusion of oil palm empty fruit bunch fibre (EFB) in cement board has promoted the internal stress development called spring back (SpB). Theoretically SpB has increased the thickness and decreases the density of the sample, and eventually decline the physical and mechanical properties of empty fruit bunch cement board (EFBCB). The main factors that have identified to contribute SpB are the length of fibres used, the ratio of cement to fibres and incompatibility between fibres and cement. Hence, this study was conducted to propose an effective approach to mitigate the effect of SpB on EFBCB samples to expedite corrective action especially along curing period. Three groups of samples namely EFB length, cement-EFB ratio and percentage NaOH concentration for EFB treatment were prepared, where each of design mixed consists of 5 repeated samples. Modulus of elasticity (MOE), modulus of rupture (MOR), internal bonding (IB) and thickness swelling (TS) are the properties that were investigated for EFBCB sample. The results revealed that combination EFB length of 16% of 25.72 mm, 64% of 14.37 mm and 20% of 4.32 mm with cement to EFB ratio of 3:1 and 3% NaOH concentration for EFB treatment has yielded optimum physical and mechanical properties. This combination has significantly diminished the SpB effect and produced MOE, MOR, IB, and TS values of 6098 N/mm2, 11.92 N/mm2, 0.53 N/mm2, and 1.22%, respectively. On top of that, the linear regression prediction model based on cement to EFB ratio and percentage of NaOH concentration for EFB treatment discovered that the maximum percentage of thickness increment due to SpB is found to be limited to 3.2% or 0.4 mm in sustaining the standard requirement. Therefore, the limit of percentage thickness increment (3.2%) has been incorporated in new laboratory technique to mitigate the SpB effect of EFB on EFBCB sample. Thus, the corrective measures can be done as early as day 2 to day 15 during the curing period for the samples with a thickness exceeding 12.4 mm (3.2% of design thickness). It can be concluded that, the reduction in thickness increment due to SpB significantly improve the performance of EFBCB samples as well as failed of EFBCB samples can be identified as earlier as during curing period purposely for design mix correction.
format	Thesis
qualification_name	Doctor of Philosophy (PhD.)
qualification_level	Doctorate
author	Nik Soh, Nik Mohd Zaini
author_facet	Nik Soh, Nik Mohd Zaini
author_sort	Nik Soh, Nik Mohd Zaini
title	The spring back effect of oil palm empty fruit bunch fibre on physical and mechanical properties of cement board
title_short	The spring back effect of oil palm empty fruit bunch fibre on physical and mechanical properties of cement board
title_full	The spring back effect of oil palm empty fruit bunch fibre on physical and mechanical properties of cement board
title_fullStr	The spring back effect of oil palm empty fruit bunch fibre on physical and mechanical properties of cement board
title_full_unstemmed	The spring back effect of oil palm empty fruit bunch fibre on physical and mechanical properties of cement board
title_sort	spring back effect of oil palm empty fruit bunch fibre on physical and mechanical properties of cement board
granting_institution	Universiti Tun Hussein Onn Malaysia
granting_department	Fakulti Kejuruteraan Awam dan Alam Bina
publishDate	2022
url	http://eprints.uthm.edu.my/8456/1/24p%20NIK%20MOHD%20ZAINI%20NIK%20SOH.pdf http://eprints.uthm.edu.my/8456/2/NIK%20MOHD%20ZAINI%20NIK%20SOH%20COPYRIGHT%20DECLARATION.pdf http://eprints.uthm.edu.my/8456/3/NIK%20MOHD%20ZAINI%20NIK%20SOH%20WATERMARK.pdf
_version_	1776103350124675072

The spring back effect of oil palm empty fruit bunch fibre on physical and mechanical properties of cement board

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