Cracking evaluation of micro steel fibre (MSF) concrete by utilising acoustic emission signal method

Concrete is one of the world’s most widely used construction material. However, it is known that concrete is a brittle composite which is sensitive to cracking. Hence, this study was conducted to enhanced the mechanical properties of concrete and to monitor the cracking activities through acoustic e...

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Main Author:	Ramasamy, Suchitra
Format:	Thesis
Language:	English English English
Published:	2022
Subjects:	TJ Mechanical engineering and machinery
Online Access:	http://eprints.uthm.edu.my/8352/1/24p%20SUCHITRA%20RAMASAMY.pdf http://eprints.uthm.edu.my/8352/2/SUCHITRA%20RAMASAMY%20COPYRIGHT%20DECLARATION.pdf http://eprints.uthm.edu.my/8352/3/SUCHITRA%20RAMASAMY%20WATERMARK.pdf
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spelling	my-uthm-ep.83522023-02-20T07:25:14Z Cracking evaluation of micro steel fibre (MSF) concrete by utilising acoustic emission signal method 2022-04 Ramasamy, Suchitra TJ Mechanical engineering and machinery Concrete is one of the world’s most widely used construction material. However, it is known that concrete is a brittle composite which is sensitive to cracking. Hence, this study was conducted to enhanced the mechanical properties of concrete and to monitor the cracking activities through acoustic emission (AE) technique. The main additional material used in this research was micro steel fibres (MSF) with a volume fraction of 0%, 0.5%, 0.75%, 1.00% and 1.25%. At the earliest stage, the mechanical properties (e.g. compressive strength test, splitting tensile test and modulus of elasticity) was determine. Next, a series of prisms were made to carry out acoustic emission (AE) signal analysis. From the data analysis, the highest compressive strength of 74.50 MPa was obtained by a concrete specimen containing 1.25% MSF at the age of 28 days. The very same specimen achieved the highest splitting tensile strength and modulus of elasticity at 5.96 MPa and 49.47 GPa, respectively. The presence of 0.5% MSF for both specimens aged for 7 and 28 days had a signal strength of 3.6 × 109 pVs and 4.0 × 109 pVs, respectively. Meanwhile, the maximum readings of absolute energy were obtained by specimens containing 0.5% and 1.00% of MSF at 8.0 × 109 aJ and 9.0 × 109 aJ, respectively. In addition, the highest amplitude value gained from this study is 99dB. From the RA value analysis, it can be concluded that the concrete specimen failed through tensile cracking. In a nutshell, the higher the presence of MSF in a concrete composite, the higher its strength. Meanwhile, the highest signal strength and absolute energy prove that the specimens have better resistance towards cracking. Moreover, the RA value analysis is appropriate for concrete crack classification. Therefore, the AE technique is found to be suitable for crack evaluation and monitoring methods. 2022-04 Thesis http://eprints.uthm.edu.my/8352/ http://eprints.uthm.edu.my/8352/1/24p%20SUCHITRA%20RAMASAMY.pdf text en public http://eprints.uthm.edu.my/8352/2/SUCHITRA%20RAMASAMY%20COPYRIGHT%20DECLARATION.pdf text en staffonly http://eprints.uthm.edu.my/8352/3/SUCHITRA%20RAMASAMY%20WATERMARK.pdf text en validuser mphil masters 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 Ramasamy, Suchitra Cracking evaluation of micro steel fibre (MSF) concrete by utilising acoustic emission signal method
description	Concrete is one of the world’s most widely used construction material. However, it is known that concrete is a brittle composite which is sensitive to cracking. Hence, this study was conducted to enhanced the mechanical properties of concrete and to monitor the cracking activities through acoustic emission (AE) technique. The main additional material used in this research was micro steel fibres (MSF) with a volume fraction of 0%, 0.5%, 0.75%, 1.00% and 1.25%. At the earliest stage, the mechanical properties (e.g. compressive strength test, splitting tensile test and modulus of elasticity) was determine. Next, a series of prisms were made to carry out acoustic emission (AE) signal analysis. From the data analysis, the highest compressive strength of 74.50 MPa was obtained by a concrete specimen containing 1.25% MSF at the age of 28 days. The very same specimen achieved the highest splitting tensile strength and modulus of elasticity at 5.96 MPa and 49.47 GPa, respectively. The presence of 0.5% MSF for both specimens aged for 7 and 28 days had a signal strength of 3.6 × 109 pVs and 4.0 × 109 pVs, respectively. Meanwhile, the maximum readings of absolute energy were obtained by specimens containing 0.5% and 1.00% of MSF at 8.0 × 109 aJ and 9.0 × 109 aJ, respectively. In addition, the highest amplitude value gained from this study is 99dB. From the RA value analysis, it can be concluded that the concrete specimen failed through tensile cracking. In a nutshell, the higher the presence of MSF in a concrete composite, the higher its strength. Meanwhile, the highest signal strength and absolute energy prove that the specimens have better resistance towards cracking. Moreover, the RA value analysis is appropriate for concrete crack classification. Therefore, the AE technique is found to be suitable for crack evaluation and monitoring methods.
format	Thesis
qualification_name	Master of Philosophy (M.Phil.)
qualification_level	Master's degree
author	Ramasamy, Suchitra
author_facet	Ramasamy, Suchitra
author_sort	Ramasamy, Suchitra
title	Cracking evaluation of micro steel fibre (MSF) concrete by utilising acoustic emission signal method
title_short	Cracking evaluation of micro steel fibre (MSF) concrete by utilising acoustic emission signal method
title_full	Cracking evaluation of micro steel fibre (MSF) concrete by utilising acoustic emission signal method
title_fullStr	Cracking evaluation of micro steel fibre (MSF) concrete by utilising acoustic emission signal method
title_full_unstemmed	Cracking evaluation of micro steel fibre (MSF) concrete by utilising acoustic emission signal method
title_sort	cracking evaluation of micro steel fibre (msf) concrete by utilising acoustic emission signal method
granting_institution	Universiti Tun Hussein Onn Malaysia
granting_department	Fakulti Kejuruteraan Awam dan Alam Bina
publishDate	2022
url	http://eprints.uthm.edu.my/8352/1/24p%20SUCHITRA%20RAMASAMY.pdf http://eprints.uthm.edu.my/8352/2/SUCHITRA%20RAMASAMY%20COPYRIGHT%20DECLARATION.pdf http://eprints.uthm.edu.my/8352/3/SUCHITRA%20RAMASAMY%20WATERMARK.pdf
_version_	1776103326653349888

Cracking evaluation of micro steel fibre (MSF) concrete by utilising acoustic emission signal method

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