Development and preliminary mix design of ultra-high-performance concrete based on geopolymer

Xu, S; Yuan, P; Liu, J; Pan, Z; Liu, Z; Su, Y; Li, J; Wu, C

Development and preliminary mix design of ultra-high-performance concrete based on geopolymer

Xu, S Yuan, P Liu, J Pan, Z Liu, Z Su, Y

Li, J

Wu, C

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Publisher:: Elsevier
Publication Type:: Journal Article
Citation:: Construction and Building Materials, 2021, 308, pp. 1-17
Issue Date:: 2021-11-15

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Field	Value	Language
dc.contributor.author	Xu, S
dc.contributor.author	Yuan, P
dc.contributor.author	Liu, J
dc.contributor.author	Pan, Z
dc.contributor.author	Liu, Z
dc.contributor.author	Su, Y https://orcid.org/0000-0003-0043-5381
dc.contributor.author	Li, J https://orcid.org/0000-0003-2457-1994
dc.contributor.author	Wu, C https://orcid.org/0000-0001-6786-7934
dc.date.accessioned	2022-03-07T03:53:27Z
dc.date.available	2022-03-07T03:53:27Z
dc.date.issued	2021-11-15
dc.identifier.citation	Construction and Building Materials, 2021, 308, pp. 1-17
dc.identifier.issn	0950-0618
dc.identifier.issn	0950-0618
dc.identifier.uri	http://hdl.handle.net/10453/155012
dc.description.abstract	This study reports a preliminary mix design of the geopolymer-based ultra-high-performance concrete (G-UHPC) developed using the alkaline activated alumino-silicate source materials. A combination of the sodium silicate (Na2SiO3) solution and sodium hydroxide (NaOH) was used as the alkaline activator, and the alumino-silicate source materials included the granulated blast furnace slag (GGBFS), fly ash and silica fume. The effect of the sodium silicate modulus, fly ash, GGBFS, Si/Al ratio, Ca/(Si + Al) ratio and steel fiber on the flowability of the fresh mixture and mechanical behavior of G-UHPC was comprehensively investigated via a series of flowability, compression and flexure tests. The X-ray diffraction (XRD) and scanning electron microscopy (SEM) analyses were conducted to reveal the performance enhancement mechanism based on the reaction products and micromorphology. It was observed that an increase in the sodium silicate modulus, GGBFS and Si/Al ratio negatively impacted the flowability of the fresh G-UHPC mixture, whereas a significantly positive effect on the flowability was observed on incorporating the fly ash. Overall, the compressive and flexural strength of G-UHPC exhibited an increasing trend, followed by a decline, on increasing the sodium silicate modulus, fly ash, GGBFS and Ca/(Si + Al) fractions. The compressive and flexural strength demonstrated an identical trend on increasing the Si/Al fraction at a CaO fraction of 0.1 or 0.2. On the other hand, an increment in the Si/Al fraction exhibited a negative impact on the compressive and flexural strength as the CaO fraction increased to 0.3. The steel fiber dosage negatively affected the flowability, whereas an increase in the steel fiber dosage enhanced the compressive and flexural strength. Further, the flowability and flexural strength could be effectively estimated from the length (Lf) -to-dimeter (Df) ratio (Lf / Df), whereas 1/(LfDf)could be used to estimate the compressive strength. The XRD and SEM analyses revealed the fundamental contribution of the mentioned factors on the reaction products and micromorphology of G-UHPCs. Eventually, suggestions have been made for the effective preliminary mix design of G-UHPC for the civil engineers.
dc.language	English
dc.publisher	Elsevier
dc.relation	National Natural Science Foundation of China51978186
dc.relation.ispartof	Construction and Building Materials
dc.relation.isbasedon	10.1016/j.conbuildmat.2021.125110
dc.rights	info:eu-repo/semantics/closedAccess
dc.subject	0905 Civil Engineering, 1202 Building
dc.subject.classification	Building & Construction
dc.title	Development and preliminary mix design of ultra-high-performance concrete based on geopolymer
dc.type	Journal Article
utslib.citation.volume	308
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	*
pubs.consider-herdc	false
dc.date.updated	2022-03-07T03:53:20Z
pubs.publication-status	Published
pubs.volume	308

Abstract:

This study reports a preliminary mix design of the geopolymer-based ultra-high-performance concrete (G-UHPC) developed using the alkaline activated alumino-silicate source materials. A combination of the sodium silicate (Na2SiO3) solution and sodium hydroxide (NaOH) was used as the alkaline activator, and the alumino-silicate source materials included the granulated blast furnace slag (GGBFS), fly ash and silica fume. The effect of the sodium silicate modulus, fly ash, GGBFS, Si/Al ratio, Ca/(Si + Al) ratio and steel fiber on the flowability of the fresh mixture and mechanical behavior of G-UHPC was comprehensively investigated via a series of flowability, compression and flexure tests. The X-ray diffraction (XRD) and scanning electron microscopy (SEM) analyses were conducted to reveal the performance enhancement mechanism based on the reaction products and micromorphology. It was observed that an increase in the sodium silicate modulus, GGBFS and Si/Al ratio negatively impacted the flowability of the fresh G-UHPC mixture, whereas a significantly positive effect on the flowability was observed on incorporating the fly ash. Overall, the compressive and flexural strength of G-UHPC exhibited an increasing trend, followed by a decline, on increasing the sodium silicate modulus, fly ash, GGBFS and Ca/(Si + Al) fractions. The compressive and flexural strength demonstrated an identical trend on increasing the Si/Al fraction at a CaO fraction of 0.1 or 0.2. On the other hand, an increment in the Si/Al fraction exhibited a negative impact on the compressive and flexural strength as the CaO fraction increased to 0.3. The steel fiber dosage negatively affected the flowability, whereas an increase in the steel fiber dosage enhanced the compressive and flexural strength. Further, the flowability and flexural strength could be effectively estimated from the length (Lf) -to-dimeter (Df) ratio (Lf / Df), whereas 1/(LfDf)could be used to estimate the compressive strength. The XRD and SEM analyses revealed the fundamental contribution of the mentioned factors on the reaction products and micromorphology of G-UHPCs. Eventually, suggestions have been made for the effective preliminary mix design of G-UHPC for the civil engineers.

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http://hdl.handle.net/10453/155012