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

Zhiyu Luo; Wengui Li; Kejin Wang; Surendra P. Shah; Daichao Sheng

doi:10.1016/j.cemconres.2021.106677

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

Zhiyu Luo, Wengui Li^*, Kejin Wang, Surendra P. Shah, Daichao Sheng

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

13 Scopus citations

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.

Original language	English (US)
Article number	106677
Journal	Cement and Concrete Research
Volume	152
DOIs	https://doi.org/10.1016/j.cemconres.2021.106677
State	Published - Feb 2022
Externally published	Yes

Keywords

Characterisation
Geopolymer concrete
Heterogeneity
Image analysis
Interfacial transition zone (ITZ)

ASJC Scopus subject areas

Building and Construction
Materials Science(all)

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10.1016/j.cemconres.2021.106677

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

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.",

keywords = "Characterisation, Geopolymer concrete, Heterogeneity, Image analysis, Interfacial transition zone (ITZ)",

author = "Zhiyu Luo and Wengui Li and Kejin Wang and Shah, {Surendra P.} and Daichao Sheng",

note = "Funding Information: The authors gratefully acknowledge the Australian Research Council ( DE150101751 ; IH150100006 ; IH200100010 ; LE210100019 ). The first author also appreciates the Australian Government Research Training Program Scholarship, Australia. The third author would also like to thank University of Technology Sydney (UTS) for supporting her visit as distinguished visiting professor at UTS. Funding Information: The authors gratefully acknowledge the Australian Research Council (DE150101751; IH150100006; IH200100010; LE210100019). The first author also appreciates the Australian Government Research Training Program Scholarship, Australia. The third author would also like to thank University of Technology Sydney (UTS) for supporting her visit as distinguished visiting professor at UTS. Publisher Copyright: {\textcopyright} 2021 Elsevier Ltd",

year = "2022",

month = feb,

doi = "10.1016/j.cemconres.2021.106677",

language = "English (US)",

volume = "152",

journal = "Cement and Concrete Research",

issn = "0008-8846",

publisher = "Elsevier Limited",

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TY - JOUR

T1 - Nano/micromechanical characterisation and image analysis on the properties and heterogeneity of ITZs in geopolymer concrete

AU - Luo, Zhiyu

AU - Li, Wengui

AU - Wang, Kejin

AU - Shah, Surendra P.

AU - Sheng, Daichao

N1 - Funding Information: The authors gratefully acknowledge the Australian Research Council ( DE150101751 ; IH150100006 ; IH200100010 ; LE210100019 ). The first author also appreciates the Australian Government Research Training Program Scholarship, Australia. The third author would also like to thank University of Technology Sydney (UTS) for supporting her visit as distinguished visiting professor at UTS. Funding Information: The authors gratefully acknowledge the Australian Research Council (DE150101751; IH150100006; IH200100010; LE210100019). The first author also appreciates the Australian Government Research Training Program Scholarship, Australia. The third author would also like to thank University of Technology Sydney (UTS) for supporting her visit as distinguished visiting professor at UTS. Publisher Copyright: © 2021 Elsevier Ltd

PY - 2022/2

Y1 - 2022/2

N2 - 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.

AB - 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.

KW - Characterisation

KW - Geopolymer concrete

KW - Heterogeneity

KW - Image analysis

KW - Interfacial transition zone (ITZ)

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

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Keywords

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