Effect Of Multi-Walled Carbon Nanotubes And Surfactants Towards Micro-Crack Using Acoustic Emission Technique

Growth and accumulation of micro-cracks result in formation of cracks at macro scale which allow penetration of water and deleterious chemicals to the cement matrix. Hence, it is essential to limit the development of cracks at the early stages and once they are at micro-scale to extend the durabilit...

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Main Author:	Ali, Yousefi
Format:	Thesis
Language:	English
Published:	2019
Subjects:	T Technology
Online Access:	http://eprints.usm.my/51255/1/Effect%20Of%20Multi-Walled%20Carbon%20Nanotubes%20And%20Surfactants%20Towards%20Micro-Crack%20Using%20Acoustic%20Emission%20Technique.pdf
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id	my-usm-ep.51255
record_format	uketd_dc
spelling	my-usm-ep.512552022-01-20T06:15:03Z Effect Of Multi-Walled Carbon Nanotubes And Surfactants Towards Micro-Crack Using Acoustic Emission Technique 2019-01-01 Ali, Yousefi T Technology TA Engineering (General). Civil engineering (General) Growth and accumulation of micro-cracks result in formation of cracks at macro scale which allow penetration of water and deleterious chemicals to the cement matrix. Hence, it is essential to limit the development of cracks at the early stages and once they are at micro-scale to extend the durability of concrete structures. This study aims to investigate the effect of various types surfactant on dispersion of Multi-walled carbon nanotubes (MWCNTs) as well as the influence of different concentrations of MWCNTs on the engineering and mechanical properties of cement mortar as well as the growth of internal micro-cracks in MWCNT-cement mortar using acoustic emission (AE) technique. Different mechanical tests including flow test, ultrasonic test, compressive and flexural test as well as characterization test such as UV-visible spectroscopy, Field Emission Scanning Electron Microscope (FESEM) and Transmission Electron Microscopy (HRTEM) were employed to evaluate the properties of MWCNT-cement composites. In addition, AE technique was used to independently validate the mechanical performance and growth of micro-cracks in the MWCNT-cement mortar. The characterization tests showed a satisfactory level of dispersion and stability for the used surfactants. The results of mechanical tests showed significant improvements in compressive strength and flexural properties of cement mortars reinforced with MWCNTs. Moreover, the microstructure observation of MWCNT-cement mortars demonstrated that MWCNTs effectively bridging micro-cracks within the cement matrix. Besides, the AE analysis confirmed that MWCNTs can limit the initiation of micro-cracks and delay the propagation and growth of micro-cracks. 2019-01 Thesis http://eprints.usm.my/51255/ http://eprints.usm.my/51255/1/Effect%20Of%20Multi-Walled%20Carbon%20Nanotubes%20And%20Surfactants%20Towards%20Micro-Crack%20Using%20Acoustic%20Emission%20Technique.pdf application/pdf en public phd doctoral Universiti Sains Malaysia Pusat Pengajian Kejuruteraan Awam
institution	Universiti Sains Malaysia
collection	USM Institutional Repository
language	English
topic	T Technology T Technology
spellingShingle	T Technology T Technology Ali, Yousefi Effect Of Multi-Walled Carbon Nanotubes And Surfactants Towards Micro-Crack Using Acoustic Emission Technique
description	Growth and accumulation of micro-cracks result in formation of cracks at macro scale which allow penetration of water and deleterious chemicals to the cement matrix. Hence, it is essential to limit the development of cracks at the early stages and once they are at micro-scale to extend the durability of concrete structures. This study aims to investigate the effect of various types surfactant on dispersion of Multi-walled carbon nanotubes (MWCNTs) as well as the influence of different concentrations of MWCNTs on the engineering and mechanical properties of cement mortar as well as the growth of internal micro-cracks in MWCNT-cement mortar using acoustic emission (AE) technique. Different mechanical tests including flow test, ultrasonic test, compressive and flexural test as well as characterization test such as UV-visible spectroscopy, Field Emission Scanning Electron Microscope (FESEM) and Transmission Electron Microscopy (HRTEM) were employed to evaluate the properties of MWCNT-cement composites. In addition, AE technique was used to independently validate the mechanical performance and growth of micro-cracks in the MWCNT-cement mortar. The characterization tests showed a satisfactory level of dispersion and stability for the used surfactants. The results of mechanical tests showed significant improvements in compressive strength and flexural properties of cement mortars reinforced with MWCNTs. Moreover, the microstructure observation of MWCNT-cement mortars demonstrated that MWCNTs effectively bridging micro-cracks within the cement matrix. Besides, the AE analysis confirmed that MWCNTs can limit the initiation of micro-cracks and delay the propagation and growth of micro-cracks.
format	Thesis
qualification_name	Doctor of Philosophy (PhD.)
qualification_level	Doctorate
author	Ali, Yousefi
author_facet	Ali, Yousefi
author_sort	Ali, Yousefi
title	Effect Of Multi-Walled Carbon Nanotubes And Surfactants Towards Micro-Crack Using Acoustic Emission Technique
title_short	Effect Of Multi-Walled Carbon Nanotubes And Surfactants Towards Micro-Crack Using Acoustic Emission Technique
title_full	Effect Of Multi-Walled Carbon Nanotubes And Surfactants Towards Micro-Crack Using Acoustic Emission Technique
title_fullStr	Effect Of Multi-Walled Carbon Nanotubes And Surfactants Towards Micro-Crack Using Acoustic Emission Technique
title_full_unstemmed	Effect Of Multi-Walled Carbon Nanotubes And Surfactants Towards Micro-Crack Using Acoustic Emission Technique
title_sort	effect of multi-walled carbon nanotubes and surfactants towards micro-crack using acoustic emission technique
granting_institution	Universiti Sains Malaysia
granting_department	Pusat Pengajian Kejuruteraan Awam
publishDate	2019
url	http://eprints.usm.my/51255/1/Effect%20Of%20Multi-Walled%20Carbon%20Nanotubes%20And%20Surfactants%20Towards%20Micro-Crack%20Using%20Acoustic%20Emission%20Technique.pdf
_version_	1747822066521866240

Effect Of Multi-Walled Carbon Nanotubes And Surfactants Towards Micro-Crack Using Acoustic Emission Technique

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