Experimental study of mechanical properties of G-UHPC against sodium sulfate attack at elevated temperature

Xu, S; Zheng, M; Yuan, P; Wu, P; Shao, R; Liu, Z; Liu, J; Wu, C

Experimental study of mechanical properties of G-UHPC against sodium sulfate attack at elevated temperature

Xu, S Zheng, M Yuan, P Wu, P Shao, R

Liu, Z Liu, J Wu, C

Permalink

Publisher:: ELSEVIER SCI LTD
Publication Type:: Journal Article
Citation:: Construction and Building Materials, 2023, 396
Issue Date:: 2023-09-08

Closed Access

	Filename	Description	Size
	1-s2.0-S0950061823021037-main.pdf	Published version	9.98 MB	Adobe PDF	View/Open

Copyright Clearance Process

Recently Added
In Progress
Closed Access

This item is closed access and not available.

Full metadata record

Field	Value	Language
dc.contributor.author	Xu, S
dc.contributor.author	Zheng, M
dc.contributor.author	Yuan, P
dc.contributor.author	Wu, P
dc.contributor.author	Shao, R https://orcid.org/0000-0002-2648-6892
dc.contributor.author	Liu, Z
dc.contributor.author	Liu, J
dc.contributor.author	Wu, C https://orcid.org/0000-0001-8907-8493
dc.date.accessioned	2024-04-08T08:29:25Z
dc.date.available	2024-04-08T08:29:25Z
dc.date.issued	2023-09-08
dc.identifier.citation	Construction and Building Materials, 2023, 396
dc.identifier.issn	0950-0618
dc.identifier.issn	1879-0526
dc.identifier.uri	http://hdl.handle.net/10453/177572
dc.description.abstract	Geopolymer based ultra-high performance (G-UHPC) would be used as mass concrete in sulfate corrosion environments. The temperature effects caused by the huge hydration heat or the high ambient temperature significantly affect its properties. The objective of this study is to investigate the mechanical properties of G-UHPC against the sulfate attack at the elevated temperature. The influences of CaO, Al2O3, and SiO2/Al2O3 molar ratio were analyzed in detail. A series of experiments including compressive, flexural, SEM, XRD, and FTIR tests were conducted to explore the compressive strength, flexural strength, the microstructure, and the reaction products of G-UHPC subjected to sulfate attack at elevated temperature. The results revealed that the G-UHPC with a lower CaO (≤0.2 %), higher Al2O3 (>0.18 %), and higher Si/Al (>4.0 %) exhibited superior sulfate corrosion resistance at elevated temperature but deteriorated mechanical properties. The degradation of mechanical properties of G-UHPC with higher CaO subjected to sulfate attack at elevated temperature was due to the substitution of Na+ for Ca2+, which rendered C-(N)-A-S-H easier to exhibit a decalcification to form N-(C)-A-S-H. The higher Al2O3 negatively affected the polyreaction and this negative effect was enhanced by sodium sulfate solution. The higher Si/Al ratio (>4.5 %) could enhance the mechanical properties of the corroded G-UHPC. The elevated temperature seems harmful to the resistance of G-UHPC against sodium sulfate attack.
dc.language	English
dc.publisher	ELSEVIER SCI LTD
dc.relation	National Natural Science Foundation of China51978186
dc.relation.ispartof	Construction and Building Materials
dc.relation.isbasedon	10.1016/j.conbuildmat.2023.132387
dc.rights	info:eu-repo/semantics/closedAccess
dc.subject	0905 Civil Engineering, 1202 Building
dc.subject.classification	Building & Construction
dc.subject.classification	3302 Building
dc.subject.classification	4005 Civil engineering
dc.subject.classification	4016 Materials engineering
dc.title	Experimental study of mechanical properties of G-UHPC against sodium sulfate attack at elevated temperature
dc.type	Journal Article
utslib.citation.volume	396
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
utslib.copyright.status	closed_access	*
dc.date.updated	2024-04-08T08:29:23Z
pubs.publication-status	Published
pubs.volume	396

Abstract:

Geopolymer based ultra-high performance (G-UHPC) would be used as mass concrete in sulfate corrosion environments. The temperature effects caused by the huge hydration heat or the high ambient temperature significantly affect its properties. The objective of this study is to investigate the mechanical properties of G-UHPC against the sulfate attack at the elevated temperature. The influences of CaO, Al2O3, and SiO2/Al2O3 molar ratio were analyzed in detail. A series of experiments including compressive, flexural, SEM, XRD, and FTIR tests were conducted to explore the compressive strength, flexural strength, the microstructure, and the reaction products of G-UHPC subjected to sulfate attack at elevated temperature. The results revealed that the G-UHPC with a lower CaO (≤0.2 %), higher Al2O3 (>0.18 %), and higher Si/Al (>4.0 %) exhibited superior sulfate corrosion resistance at elevated temperature but deteriorated mechanical properties. The degradation of mechanical properties of G-UHPC with higher CaO subjected to sulfate attack at elevated temperature was due to the substitution of Na+ for Ca2+, which rendered C-(N)-A-S-H easier to exhibit a decalcification to form N-(C)-A-S-H. The higher Al2O3 negatively affected the polyreaction and this negative effect was enhanced by sodium sulfate solution. The higher Si/Al ratio (>4.5 %) could enhance the mechanical properties of the corroded G-UHPC. The elevated temperature seems harmful to the resistance of G-UHPC against sodium sulfate attack.

Please use this identifier to cite or link to this item:

http://hdl.handle.net/10453/177572