Nano/micromechanical characterisation and image analysis on the properties and heterogeneity of ITZs in geopolymer concrete

Luo, Z; Li, W; Wang, K; Shah, SP; Sheng, D

Nano/micromechanical characterisation and image analysis on the properties and heterogeneity of ITZs in geopolymer concrete

Luo, Z Li, W

Wang, K Shah, SP Sheng, D

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Publisher:: PERGAMON-ELSEVIER SCIENCE LTD
Publication Type:: Journal Article
Citation:: Cement and Concrete Research, 2022, 152
Issue Date:: 2022-02-01

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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	Wang, K
dc.contributor.author	Shah, SP
dc.contributor.author	Sheng, D https://orcid.org/0000-0002-1665-6931
dc.date.accessioned	2022-05-03T07:14:31Z
dc.date.available	2022-05-03T07:14:31Z
dc.date.issued	2022-02-01
dc.identifier.citation	Cement and Concrete Research, 2022, 152
dc.identifier.issn	0008-8846
dc.identifier.issn	1873-3948
dc.identifier.uri	http://hdl.handle.net/10453/156948
dc.description.abstract	Heterogeneity of interfacial transition zones (ITZs) is a key factor for the properties and failure mechanism of geopolymer concrete. The nano/microscale properties and heterogeneity of the ITZs (the top, bottom and lateral interfaces) prepared by encompassing polished aggregates in the modelled fly ash-based geopolymer concrete were statistically investigated in this study. The nanoindentation and nanoscratch results show that the nano/micromechanical properties of the gel-related phases of ITZs at the top and bottom boundaries are higher than the corresponding ones at the lateral boundaries and bulk paste. The mechanism of the better properties of ITZs at the top and bottom boundaries is unveiled based on quantitative image analysis of the amount, diameter and proportion distribution of fly ash particles. A strategy of controlling heterogeneity of ITZs and using polished aggregates, rapid scratch and statistical analysis is proposed to investigate more complicated ITZs within acceptable testing duration.
dc.language	English
dc.publisher	PERGAMON-ELSEVIER SCIENCE LTD
dc.relation	http://purl.org/au-research/grants/arc/DE150101751
dc.relation	http://purl.org/au-research/grants/arc/IH150100006
dc.relation	http://purl.org/au-research/grants/arc/IH200100010
dc.relation	http://purl.org/au-research/grants/arc/LE210100019
dc.relation.ispartof	Cement and Concrete Research
dc.relation.isbasedon	10.1016/j.cemconres.2021.106677
dc.rights	info:eu-repo/semantics/closedAccess
dc.subject	0904 Chemical Engineering, 0905 Civil Engineering, 1202 Building
dc.subject.classification	Building & Construction
dc.title	Nano/micromechanical characterisation and image analysis on the properties and heterogeneity of ITZs in geopolymer concrete
dc.type	Journal Article
utslib.citation.volume	152
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	*
dc.date.updated	2022-05-03T07:14:30Z
pubs.publication-status	Published
pubs.volume	152

Abstract:

Heterogeneity of interfacial transition zones (ITZs) is a key factor for the properties and failure mechanism of geopolymer concrete. The nano/microscale properties and heterogeneity of the ITZs (the top, bottom and lateral interfaces) prepared by encompassing polished aggregates in the modelled fly ash-based geopolymer concrete were statistically investigated in this study. The nanoindentation and nanoscratch results show that the nano/micromechanical properties of the gel-related phases of ITZs at the top and bottom boundaries are higher than the corresponding ones at the lateral boundaries and bulk paste. The mechanism of the better properties of ITZs at the top and bottom boundaries is unveiled based on quantitative image analysis of the amount, diameter and proportion distribution of fly ash particles. A strategy of controlling heterogeneity of ITZs and using polished aggregates, rapid scratch and statistical analysis is proposed to investigate more complicated ITZs within acceptable testing duration.

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http://hdl.handle.net/10453/156948