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

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3D imaging techniques for characterising microcracks in cement-based materials_4DRAC.pdf (6,184Mb)
 
10.1016/j.cemconres.2020.106309
 
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Mac, Monika Jolanta
Yio, Marcus H.N.
Desbois, Guillaume
Casanova Hormaechea, IgnasiMés informacióMés informacióMés informació
Wong, Hong S.
Buenfeld, Nick R.
Document typeArticle
Defense date2021-02
Rights accessOpen Access
Attribution-NonCommercial-NoDerivs 4.0 International
Except where otherwise noted, content on this work is licensed under a Creative Commons license : Attribution-NonCommercial-NoDerivs 4.0 International
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.
CitationMac, M. [et al.]. 3D imaging techniques for characterising microcracks in cement-based materials. "Cement and concrete research", Febrer 2021, vol. 140, p. 106309:1-106309:14. 
URIhttp://hdl.handle.net/2117/333158
DOI10.1016/j.cemconres.2020.106309
ISSN0008-8846
Publisher versionhttps://www.sciencedirect.com/science/article/abs/pii/S0008884620315891
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