Predictive model of setting times and compressive strengths for low-alkali, ambient-cured, fly ash/slag-based geopolymers

Ukritnukun, S; Koshy, P; Rawal, A; Castel, A; Sorrell, CC

Predictive model of setting times and compressive strengths for low-alkali, ambient-cured, fly ash/slag-based geopolymers

Ukritnukun, S Koshy, P Rawal, A Castel, A

Sorrell, CC

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Publisher:: MDPI
Publication Type:: Journal Article
Citation:: Minerals, 2020, 10, (10), pp. 1-21
Issue Date:: 2020-10-01

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Field	Value	Language
dc.contributor.author	Ukritnukun, S
dc.contributor.author	Koshy, P
dc.contributor.author	Rawal, A
dc.contributor.author	Castel, A https://orcid.org/0000-0003-1619-9643
dc.contributor.author	Sorrell, CC
dc.date.accessioned	2021-03-28T19:56:20Z
dc.date.available	2021-03-28T19:56:20Z
dc.date.issued	2020-10-01
dc.identifier.citation	Minerals, 2020, 10, (10), pp. 1-21
dc.identifier.issn	2075-163X
dc.identifier.issn	2075-163X
dc.identifier.uri	http://hdl.handle.net/10453/147576
dc.description.abstract	© 2020 by the authors. Licensee MDPI, Basel, Switzerland. The effects of curing temperature, blast furnace slag content, and Ms on the initial and final setting times, and compressive strengths of geopolymer paste and mortars are examined. The present work demonstrates that ambient-cured geopolymer pastes and mortars can be fabricated without requiring high alkalinity activators or thermal curing, provided that the ratios of Class F fly ash (40–90 wt%), blast furnace slag (10–60 wt%), and low alkalinity sodium silicate (Ms = 1.5, 1.7, 2.0) are appropriately balanced. Eighteen mix designs were assessed against the criteria for setting time and compressive strength according to ASTM C150 and AS 3972. Using these data, flexible and reproducible mix designs in terms of the fly ash/slag ratio and Ms were mapped and categorised. The optimal mix designs are 30–40 wt% slag with silicate modulus (Ms) = 1.5–1.7. These data were used to generate predictive models for initial and final setting times and for ultimate curing times and ultimate compressive strengths. These projected data indicate that compressive strengths >100 MPa can be achieved after ambient curing for >56 days of mixes of ≥40 wt% slag.
dc.language	English
dc.publisher	MDPI
dc.relation.ispartof	Minerals
dc.relation.isbasedon	10.3390/min10100920
dc.rights	info:eu-repo/semantics/openAccess
dc.subject	0403 Geology, 0502 Environmental Science and Management, 0914 Resources Engineering and Extractive Metallurgy
dc.title	Predictive model of setting times and compressive strengths for low-alkali, ambient-cured, fly ash/slag-based geopolymers
dc.type	Journal Article
utslib.citation.volume	10
utslib.for	0905 Civil Engineering
utslib.for	0403 Geology
utslib.for	0502 Environmental Science and Management
utslib.for	0914 Resources Engineering and Extractive Metallurgy
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.date.updated	2021-03-28T19:56:18Z
pubs.issue	10
pubs.publication-status	Published
pubs.volume	10
utslib.citation.issue	10

Abstract:

© 2020 by the authors. Licensee MDPI, Basel, Switzerland. The effects of curing temperature, blast furnace slag content, and Ms on the initial and final setting times, and compressive strengths of geopolymer paste and mortars are examined. The present work demonstrates that ambient-cured geopolymer pastes and mortars can be fabricated without requiring high alkalinity activators or thermal curing, provided that the ratios of Class F fly ash (40–90 wt%), blast furnace slag (10–60 wt%), and low alkalinity sodium silicate (Ms = 1.5, 1.7, 2.0) are appropriately balanced. Eighteen mix designs were assessed against the criteria for setting time and compressive strength according to ASTM C150 and AS 3972. Using these data, flexible and reproducible mix designs in terms of the fly ash/slag ratio and Ms were mapped and categorised. The optimal mix designs are 30–40 wt% slag with silicate modulus (Ms) = 1.5–1.7. These data were used to generate predictive models for initial and final setting times and for ultimate curing times and ultimate compressive strengths. These projected data indicate that compressive strengths >100 MPa can be achieved after ambient curing for >56 days of mixes of ≥40 wt% slag.

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http://hdl.handle.net/10453/147576