Implementing the effect of geopolymer concrete pore solution pH in the standard rapid migration test NT Build 492 protocol

Pang, Y; Nguyen, QD; Castel, A

Implementing the effect of geopolymer concrete pore solution pH in the standard rapid migration test NT Build 492 protocol

Pang, Y Nguyen, QD Castel, A

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Publisher:: SPRINGER
Publication Type:: Journal Article
Citation:: MATERIALS AND STRUCTURES, 2025, 58, (2)
Issue Date:: 2025-03

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Field	Value	Language
dc.contributor.author	Pang, Y
dc.contributor.author	Nguyen, QD
dc.contributor.author	Castel, A https://orcid.org/0000-0003-1619-9643
dc.date.accessioned	2025-04-14T00:05:15Z
dc.date.available	2025-04-14T00:05:15Z
dc.date.issued	2025-03
dc.identifier.citation	MATERIALS AND STRUCTURES, 2025, 58, (2)
dc.identifier.issn	1359-5997
dc.identifier.issn	1871-6873
dc.identifier.uri	http://hdl.handle.net/10453/186867
dc.description.abstract	<jats:title>Abstract</jats:title> <jats:p>This research investigates the impact of the pore solution pH values on chloride content at the colour change boundary determined according to the standard rapid migration test (NT Build 492), with a focus on alkali-activated materials, so-called geopolymer. The study investigates a range of geopolymer formulations using various proportions of ground granulated blast furnace slag (GGBFS), fly ash, and calcined clay, alongside different activator concentrations, to examine their influence on the pH value of the pore solution. Findings from this study suggest that the pH value of the pore solution greatly influence in the chloride ion concentration at the colour change boundary, which should be accounted for in the calculation of the non-steady-state migration coefficients (D<jats:sub>nssm</jats:sub>). It is noted that mixtures with higher GGBFS content exhibit higher pH values than mixtures containing fly ash or calcined clay, impacting the D<jats:sub>nssm</jats:sub>. The results advocate for modifications to the standard NT Build 492 protocol to enhance its applicability and accuracy for geopolymer materials, emphasizing the importance of using revised D<jats:sub>nssm</jats:sub> values calculated considering the unique properties of geopolymer concrete for more durability assessment.</jats:p>
dc.language	English
dc.publisher	SPRINGER
dc.relation.ispartof	MATERIALS AND STRUCTURES
dc.relation.isbasedon	10.1617/s11527-025-02586-0
dc.rights	info:eu-repo/semantics/openAccess
dc.subject	0905 Civil Engineering
dc.subject.classification	Building & Construction
dc.subject.classification	4005 Civil engineering
dc.title	Implementing the effect of geopolymer concrete pore solution pH in the standard rapid migration test NT Build 492 protocol
dc.type	Journal Article
utslib.citation.volume	58
utslib.for	0905 Civil Engineering
pubs.organisational-group	University of Technology Sydney
pubs.organisational-group	University of Technology Sydney/Faculty of Engineering and Information Technology
pubs.organisational-group	University of Technology Sydney/Faculty of Engineering and Information Technology/School of Civil and Environmental Engineering
utslib.copyright.status	open_access	*
dc.rights.license	This work is licensed under a Creative Commons Attribution 4.0 International License (CC BY 4.0). To view a copy of this license, visit https://creativecommons.org/licenses/by/4.0/
dc.date.updated	2025-04-14T00:05:14Z
pubs.issue	2
pubs.publication-status	Published
pubs.volume	58
utslib.citation.issue	2

Abstract:

Abstract This research investigates the impact of the pore solution pH values on chloride content at the colour change boundary determined according to the standard rapid migration test (NT Build 492), with a focus on alkali-activated materials, so-called geopolymer. The study investigates a range of geopolymer formulations using various proportions of ground granulated blast furnace slag (GGBFS), fly ash, and calcined clay, alongside different activator concentrations, to examine their influence on the pH value of the pore solution. Findings from this study suggest that the pH value of the pore solution greatly influence in the chloride ion concentration at the colour change boundary, which should be accounted for in the calculation of the non-steady-state migration coefficients (Dnssm). It is noted that mixtures with higher GGBFS content exhibit higher pH values than mixtures containing fly ash or calcined clay, impacting the Dnssm. The results advocate for modifications to the standard NT Build 492 protocol to enhance its applicability and accuracy for geopolymer materials, emphasizing the importance of using revised Dnssm values calculated considering the unique properties of geopolymer concrete for more durability assessment.

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http://hdl.handle.net/10453/186867