A comparative study of calcium hydroxide, calcium oxide, calcined dolomite, and metasilicate as activators for slag-based HPC

Bahmani, H; Mostafaei, H; Ghiassi, B; Mostofinejad, D; Wu, C

A comparative study of calcium hydroxide, calcium oxide, calcined dolomite, and metasilicate as activators for slag-based HPC

Bahmani, H Mostafaei, H Ghiassi, B Mostofinejad, D Wu, C

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Publisher:: Elsevier
Publication Type:: Journal Article
Citation:: Structures, 2023, 58, pp. 105653
Issue Date:: 2023-12-01

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Field	Value	Language
dc.contributor.author	Bahmani, H
dc.contributor.author	Mostafaei, H
dc.contributor.author	Ghiassi, B
dc.contributor.author	Mostofinejad, D
dc.contributor.author	Wu, C https://orcid.org/0000-0001-8907-8493
dc.date.accessioned	2024-03-14T22:45:05Z
dc.date.available	2024-03-14T22:45:05Z
dc.date.issued	2023-12-01
dc.identifier.citation	Structures, 2023, 58, pp. 105653
dc.identifier.issn	2352-0124
dc.identifier.issn	2352-0124
dc.identifier.uri	http://hdl.handle.net/10453/176731
dc.description.abstract	In this study, the mechanical characteristics and microstructure of high-performance concrete (HPC) were thoroughly investigated and the influences of alkaline earth and metasilicate activators on material properties were comprehensively analyzed. Moreover, the carbon footprint of each mix design was evaluated and the strength to the carbon footprint was quantified. To evaluate the mechanical properties, the samples underwent tests for compressive, tensile, and flexural strengths at 28 days. Microstructure characteristics were analyzed using Scanning Electron Microscopy (SEM) and Thermogravimetric Analysis/Differential Thermal Analysis (TGA/DTA). Additionally, electrical resistance and water absorption tests were conducted. The findings revealed that employing 10% CaO as an HPC activator resulted in the highest compressive strength (80 MPa), flexural strength (6.4 MPa), splitting tensile strength (5.5 MPa), and electrical resistance (445 Ωm). Moreover, these samples exhibited the lowest water absorption percentage (2%). TGA/DTA analysis indicated the highest content of Calcium Silicate Hydrate (C-S-H) in the geopolymer matrix of samples activated with 10% CaO. SEM analysis confirmed the densest microstructure formation in these samples. Moreover, the study demonstrated that using 10% CaO as an HPC activator can yield superior strength to the embodied carbon footprint.
dc.language	en
dc.publisher	Elsevier
dc.relation.ispartof	Structures
dc.relation.isbasedon	10.1016/j.istruc.2023.105653
dc.rights	info:eu-repo/semantics/closedAccess
dc.subject	0905 Civil Engineering, 1202 Building
dc.subject.classification	4005 Civil engineering
dc.title	A comparative study of calcium hydroxide, calcium oxide, calcined dolomite, and metasilicate as activators for slag-based HPC
dc.type	Journal Article
utslib.citation.volume	58
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	2024-03-14T22:45:01Z
pubs.publication-status	Published
pubs.volume	58

Abstract:

In this study, the mechanical characteristics and microstructure of high-performance concrete (HPC) were thoroughly investigated and the influences of alkaline earth and metasilicate activators on material properties were comprehensively analyzed. Moreover, the carbon footprint of each mix design was evaluated and the strength to the carbon footprint was quantified. To evaluate the mechanical properties, the samples underwent tests for compressive, tensile, and flexural strengths at 28 days. Microstructure characteristics were analyzed using Scanning Electron Microscopy (SEM) and Thermogravimetric Analysis/Differential Thermal Analysis (TGA/DTA). Additionally, electrical resistance and water absorption tests were conducted. The findings revealed that employing 10% CaO as an HPC activator resulted in the highest compressive strength (80 MPa), flexural strength (6.4 MPa), splitting tensile strength (5.5 MPa), and electrical resistance (445 Ωm). Moreover, these samples exhibited the lowest water absorption percentage (2%). TGA/DTA analysis indicated the highest content of Calcium Silicate Hydrate (C-S-H) in the geopolymer matrix of samples activated with 10% CaO. SEM analysis confirmed the densest microstructure formation in these samples. Moreover, the study demonstrated that using 10% CaO as an HPC activator can yield superior strength to the embodied carbon footprint.

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http://hdl.handle.net/10453/176731