Nanoindentation on micromechanical properties and microstructure of geopolymer with nano-SiO<inf>2</inf> and nano-TiO<inf>2</inf>

Luo, Z; Li, W; Gan, Y; He, X; Castel, A; Sheng, D

Nanoindentation on micromechanical properties and microstructure of geopolymer with nano-SiO<inf>2</inf> and nano-TiO<inf>2</inf>

Luo, Z Li, W

Gan, Y He, X

Castel, A

Sheng, D

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Publisher:: Elsevier
Publication Type:: Journal Article
Citation:: Cement and Concrete Composites, 2021, 117, pp. 1-11
Issue Date:: 2021-03-01

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Field	Value	Language
dc.contributor.author	Luo, Z
dc.contributor.author	Li, W https://orcid.org/0000-0002-4651-1215
dc.contributor.author	Gan, Y
dc.contributor.author	He, X https://orcid.org/0000-0001-5336-3663
dc.contributor.author	Castel, A https://orcid.org/0000-0003-1619-9643
dc.contributor.author	Sheng, D https://orcid.org/0000-0002-1665-6931
dc.date.accessioned	2022-04-14T04:01:49Z
dc.date.available	2022-04-14T04:01:49Z
dc.date.issued	2021-03-01
dc.identifier.citation	Cement and Concrete Composites, 2021, 117, pp. 1-11
dc.identifier.issn	0958-9465
dc.identifier.issn	1873-393X
dc.identifier.uri	http://hdl.handle.net/10453/156254
dc.description.abstract	Fly ash-based geopolymers incorporated with 2% nano-SiO2 (NS)/nano-TiO2 (NT) particles were subjected to microstructural and statistical nanoindentation analysis. With the addition of both types of nanoparticles, the compressive strength of geopolymer and the micromechanical properties of N-A-S-H gel were increased. NS exhibited higher reinforcement effect than NT on macro-strength. However, NT more significantly enhanced gel micromechanical properties. NT and especially the NS were found to have a positive effect on the early reaction rate of geopolymer. After 28 days, the gel proportion obtained by Backscattered electron (BSE) images analysis was close values of 49.16%, 55.69% and 54.02% for reference sample and NS, NT reinforced geopolymer, which were more than two times of that from the statistical nanoindentation. The effects of NS and NT on microstructure, gel proportion and gel micromechanical properties were discussed to reveal the macro-strength reinforcement mechanism. The results obtained from different techniques were also compared and discussed.
dc.language	English
dc.publisher	Elsevier
dc.relation	http://purl.org/au-research/grants/arc/DE150101751
dc.relation	http://purl.org/au-research/grants/arc/IH150100006
dc.relation.ispartof	Cement and Concrete Composites
dc.relation.isbasedon	10.1016/j.cemconcomp.2020.103883
dc.rights	info:eu-repo/semantics/closedAccess
dc.subject	0904 Chemical Engineering, 0905 Civil Engineering, 1202 Building
dc.subject.classification	Building & Construction
dc.title	Nanoindentation on micromechanical properties and microstructure of geopolymer with nano-SiO<inf>2</inf> and nano-TiO<inf>2</inf>
dc.type	Journal Article
utslib.citation.volume	117
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
utslib.copyright.status	closed_access	*
pubs.consider-herdc	false
dc.date.updated	2022-04-14T04:01:43Z
pubs.publication-status	Published
pubs.volume	117

Abstract:

Fly ash-based geopolymers incorporated with 2% nano-SiO2 (NS)/nano-TiO2 (NT) particles were subjected to microstructural and statistical nanoindentation analysis. With the addition of both types of nanoparticles, the compressive strength of geopolymer and the micromechanical properties of N-A-S-H gel were increased. NS exhibited higher reinforcement effect than NT on macro-strength. However, NT more significantly enhanced gel micromechanical properties. NT and especially the NS were found to have a positive effect on the early reaction rate of geopolymer. After 28 days, the gel proportion obtained by Backscattered electron (BSE) images analysis was close values of 49.16%, 55.69% and 54.02% for reference sample and NS, NT reinforced geopolymer, which were more than two times of that from the statistical nanoindentation. The effects of NS and NT on microstructure, gel proportion and gel micromechanical properties were discussed to reveal the macro-strength reinforcement mechanism. The results obtained from different techniques were also compared and discussed.

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