Corrosion mechanisms of steel reinforcement in fly ash/slag based powder form of geopolymer concrete

Vu, Tran Huyen

Corrosion mechanisms of steel reinforcement in fly ash/slag based powder form of geopolymer concrete

Vu, Tran Huyen

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Publication Type:: Thesis
Issue Date:: 2021

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Field	Value	Language
dc.contributor.author	Vu, Tran Huyen
dc.date.accessioned	2022-01-14T00:30:05Z
dc.date.available	2022-01-14T00:30:05Z
dc.date.issued	2021
dc.identifier.uri	http://hdl.handle.net/10453/153085
dc.description	University of Technology Sydney. Faculty of Engineering and Information Technology.	en_US.UTF-8
dc.description.abstract	To promote the use of geopolymer materials in structure applications, this study aimed to investigate on carbonation and chloride resistance of one-part fly ash/slag geopolymer concretes. Additionally, the possibility of using a sodium-based set retarder to address the issue of short setting time was included in the investigation. The key findings indicated that using the set retarder, with an amount of 2-6%, prolonged the setting time of one-part geopolymer binders and reduced the heat released by activation reactions. The results obtained also showed that carbonation alone might not lead to steel corrosion in one-part geopolymer concrete investigated because the pH in carbonated parts was always higher than 10. For assessing chloride resistance in an accelerated test in 16.5% NaCl solution, 40% fly ash/ 60% slag geopolymer concrete had a lower chloride resistance than OPC concretes, while chloride resistance of 60% fly ash/ 40% slag geopolymer concrete was worse. Due to the presence of both fly ash and slag in the precursor, chloride ions were physically and chemically bound in the one-part geopolymer concretes. Regarding RCPT, using 60 voltage, advocated in ASTM C1202, caused the issue of overheating, thus, RCPT performed at 30 voltage was highly suggested.	en_US.UTF-8
dc.format	Thesis (PhD)
dc.language.iso	en_US	en_US.UTF-8
dc.relation	https://opus.lib.uts.edu.au/bitstream/10453/153085/2/02whole.pdf
dc.rights	info:eu-repo/semantics/openAccess
dc.rights	The author owns the copyright in this thesis including all reproduction and reuse rights for the work. The work may not be altered without the permission of the copyright owner. Attribution is essential when quoting or paraphrasing from this thesis.
dc.rights	au.edu.uts.lib/ppc
dc.title	Corrosion mechanisms of steel reinforcement in fly ash/slag based powder form of geopolymer concrete	en_US.UTF-8
dc.type	Thesis
utslib.copyright.status	open_access	*

Abstract:

To promote the use of geopolymer materials in structure applications, this study aimed to investigate on carbonation and chloride resistance of one-part fly ash/slag geopolymer concretes. Additionally, the possibility of using a sodium-based set retarder to address the issue of short setting time was included in the investigation. The key findings indicated that using the set retarder, with an amount of 2-6%, prolonged the setting time of one-part geopolymer binders and reduced the heat released by activation reactions. The results obtained also showed that carbonation alone might not lead to steel corrosion in one-part geopolymer concrete investigated because the pH in carbonated parts was always higher than 10. For assessing chloride resistance in an accelerated test in 16.5% NaCl solution, 40% fly ash/ 60% slag geopolymer concrete had a lower chloride resistance than OPC concretes, while chloride resistance of 60% fly ash/ 40% slag geopolymer concrete was worse. Due to the presence of both fly ash and slag in the precursor, chloride ions were physically and chemically bound in the one-part geopolymer concretes. Regarding RCPT, using 60 voltage, advocated in ASTM C1202, caused the issue of overheating, thus, RCPT performed at 30 voltage was highly suggested.

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http://hdl.handle.net/10453/153085