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3D imaging techniques for characterising microcracks in cement-based materials

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Title: 3D imaging techniques for characterising microcracks in cement-based materials
Authors: Mac, M
Yio, M
Desbois, G
Casanova, I
Wong, H
Buenfeld, N
Item Type: Journal Article
Abstract: Concrete inherently contains pores and microcracks that can adversely impact its mechanical properties and long-term durability. However, characterising microcracks is difficult due to their complex, multiscale and three-dimensional (3D) nature. This paper presents an evaluation of 3D imaging techniques for characterising microcracks induced by different mechanisms. Seven cement pastes, mortars and concretes subjected to drying shrinkage, autogenous shrinkage and freeze-thaw cycles were investigated using focused ion beam nanotomography (FIB-nt), broad ion beam serial section tomography (BIB-SST), laser scanning confocal microscopy (LSCM) combined with serial sectioning and X-ray microtomography (μCT). The study shows that the characteristics of microcracks vary significantly depending on exposure conditions. Yet there is no single technique that can capture the entire size range of microcracks from sub to tens of μm within a sufficiently representative sampling volume. The achievable image volume and resolution, and the advantages and disadvantages of each technique are compared and discussed.
Issue Date: Feb-2021
Date of Acceptance: 13-Nov-2020
URI: http://hdl.handle.net/10044/1/85001
DOI: 10.1016/j.cemconres.2020.106309
ISSN: 0008-8846
Publisher: Elsevier
Journal / Book Title: Cement and Concrete Research
Volume: 140
Copyright Statement: © 2020 Elsevier Ltd. All rights reserved. This manuscript is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International Licence http://creativecommons.org/licenses/by-nc-nd/4.0/
Sponsor/Funder: Ecole Polytechnique Federation de Lausanne
Engineering & Physical Science Research Council (E
Funder's Grant Number: PITN-GA-2010-264448
EP/R010161/1
Keywords: 0904 Chemical Engineering
0905 Civil Engineering
1202 Building
Building & Construction
Publication Status: Published
Article Number: 106309
Online Publication Date: 2020-11-18
Appears in Collections:Civil and Environmental Engineering
Faculty of Engineering



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