Representative elementary volume (REV) of cementitious materials from three-dimensional pore structure analysis

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Title: Representative elementary volume (REV) of cementitious materials from three-dimensional pore structure analysis
Authors: Yio, MHN
Wong, HS
Buenfeld, NR
Item Type: Journal Article
Abstract: The representative elementary volume (REV) is a fundamental property of a material, but no direct measurements exist for cementitious materials. In this paper, the REV of cement pastes with supplementary cementitious materials (GGBS, PFA, SF) was determined by analysing the three-dimensional pore structure (> 0.2 μm) using laser scanning confocal microscopy (LSCM). The effect of axial distortion inherent to LSCM on 3D pore structure was also investigated. A range of 3D pore parameters was measured using skeletonisation, maximal ball and random walker algorithms. Results show that axial distortion has insignificant effects on most parameters except Euler connectivity, average pore and throat volumes and directional diffusion tortuosities. Most pore parameters become independent of sampling volume at ≈ 603 μm3 except diffusion tortuosities and formation factor. The REV for porosity calculated based on a statistical approach at eight realisations and 5% relative error was found to be ≈ 1003 μm3.
Issue Date: 28-Sep-2017
Date of Acceptance: 22-Sep-2017
ISSN: 0008-8846
Publisher: Elsevier
Start Page: 187
End Page: 202
Journal / Book Title: Cement and Concrete Research
Volume: 102
Copyright Statement: © 2017, Elsevier. Licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International
Keywords: 0905 Civil Engineering
1202 Building
Building & Construction
Publication Status: Published
Appears in Collections:Faculty of Engineering
Civil and Environmental Engineering

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