Hydration of Portland cement with seawater toward concrete sustainability: Phase evolution and thermodynamic modelling

Li, P; Li, W; Wang, K; Zhou, JL; Castel, A; Zhang, S; Shah, SP

Hydration of Portland cement with seawater toward concrete sustainability: Phase evolution and thermodynamic modelling

Li, P Li, W

Wang, K Zhou, JL Castel, A Zhang, S Shah, SP

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Publisher:: Elsevier
Publication Type:: Journal Article
Citation:: Cement and Concrete Composites, 2023, 138, pp. 105007
Issue Date:: 2023-04-01

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Field	Value	Language
dc.contributor.author	Li, P
dc.contributor.author	Li, W https://orcid.org/0000-0002-4651-1215
dc.contributor.author	Wang, K
dc.contributor.author	Zhou, JL
dc.contributor.author	Castel, A
dc.contributor.author	Zhang, S
dc.contributor.author	Shah, SP
dc.date.accessioned	2023-05-05T02:19:39Z
dc.date.available	2023-05-05T02:19:39Z
dc.date.issued	2023-04-01
dc.identifier.citation	Cement and Concrete Composites, 2023, 138, pp. 105007
dc.identifier.issn	0958-9465
dc.identifier.uri	http://hdl.handle.net/10453/170215
dc.description.abstract	To mitigate the shortage of freshwater resource in the island and coastal regions, using seawater (SW) for concrete mix can provide significant economic and environmental benefits. To achieve a safe and reliable application, in-depth investigation is needed on hydration of Portland cement in SW. The composition of solid and liquid phases in hydrated Portland cement was quantitively determined and analysed in this study. The use of SW not only significantly increases the hydration rate of clinker but also affects the evolution of phase assemblage. Both the thermodynamic calculations and experimental determinations indicates the formation of Friedel's salt (FS) instead of sulfo-AFm in hydrated cement by SW, implying sulfate ions cannot compete with chloride ions to combine with AFm phases. The characteristic reaction in SW leads to higher sulfate concentration, thus indirectly hindering ettringite (AFt) conversion at the late stage. Through the experimental quantification of thermogravimetric analysis and X-ray diffraction analysis, the kinetic model of clinker dissolution was modified to be more suitable for the hydration of Portland cement in SW. The calculation from coupled models exhibits a novel method to evaluate the evolution of phases in cement hydration. Through model calculations, 3.70% higher solid volume and 12.2% lower liquid volume were obtained in the cement-SW paste at the end of the hydration, which may cause the mechanical properties to be more sensitive under environmental humidity and the temperature.
dc.language	en
dc.publisher	Elsevier
dc.relation	http://purl.org/au-research/grants/arc/DP220101051
dc.relation	http://purl.org/au-research/grants/arc/DP220100036
dc.relation	http://purl.org/au-research/grants/arc/FT220100177
dc.relation.ispartof	Cement and Concrete Composites
dc.relation.isbasedon	10.1016/j.cemconcomp.2023.105007
dc.rights	info:eu-repo/semantics/closedAccess
dc.subject	0904 Chemical Engineering, 0905 Civil Engineering, 1202 Building
dc.subject.classification	Building & Construction
dc.title	Hydration of Portland cement with seawater toward concrete sustainability: Phase evolution and thermodynamic modelling
dc.type	Journal Article
utslib.citation.volume	138
utslib.for	0904 Chemical Engineering
utslib.for	0905 Civil Engineering
utslib.for	1202 Building
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
pubs.organisational-group	/University of Technology Sydney/Strength - CBI - Centre for Built Infrastructure
pubs.organisational-group	/University of Technology Sydney/Strength - CTWW - Centre for Technology in Water and Wastewater Treatment
utslib.copyright.status	closed_access	*
dc.date.updated	2023-05-05T02:19:36Z
pubs.publication-status	Published
pubs.volume	138

Abstract:

To mitigate the shortage of freshwater resource in the island and coastal regions, using seawater (SW) for concrete mix can provide significant economic and environmental benefits. To achieve a safe and reliable application, in-depth investigation is needed on hydration of Portland cement in SW. The composition of solid and liquid phases in hydrated Portland cement was quantitively determined and analysed in this study. The use of SW not only significantly increases the hydration rate of clinker but also affects the evolution of phase assemblage. Both the thermodynamic calculations and experimental determinations indicates the formation of Friedel's salt (FS) instead of sulfo-AFm in hydrated cement by SW, implying sulfate ions cannot compete with chloride ions to combine with AFm phases. The characteristic reaction in SW leads to higher sulfate concentration, thus indirectly hindering ettringite (AFt) conversion at the late stage. Through the experimental quantification of thermogravimetric analysis and X-ray diffraction analysis, the kinetic model of clinker dissolution was modified to be more suitable for the hydration of Portland cement in SW. The calculation from coupled models exhibits a novel method to evaluate the evolution of phases in cement hydration. Through model calculations, 3.70% higher solid volume and 12.2% lower liquid volume were obtained in the cement-SW paste at the end of the hydration, which may cause the mechanical properties to be more sensitive under environmental humidity and the temperature.

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http://hdl.handle.net/10453/170215