3D pore structure and mass transport properties of blended cementitious materials

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Title: 3D pore structure and mass transport properties of blended cementitious materials
Authors: Yio, MHN
Wong, H
Buenfeld, N
Item Type: Journal Article
Abstract: The effect of supplementary cementitious materials on three-dimensional pore structure and how this influences mass transport properties are not well understood. This paper examines the effect of silica fume, fly ash and ground granulated blastfurnace slag on 3D structure of capillary pores (>0.24 μm) within 1003 μm3 cement paste for the first time using laser scanning confocal microscopy, combined with backscattered electron imaging and mercury intrusion porosimetry. Pastes containing different binder types, w/b ratios and curing ages were tested. Results show that SF enhances 3D pore structure from early ages whereas PFA and GGBS show improvements at later ages. SCMs not only reduce the volume and size of accessible pores, but also decrease connectivity and increase tortuosity, pore coordination number and formation factor. Measured 3D pore parameters were used as modelling inputs to estimate diffusivity and permeability. Predictions to within a factor of five from measured values were obtained.
Issue Date: 1-Mar-2019
Date of Acceptance: 14-Dec-2018
URI: http://hdl.handle.net/10044/1/66806
DOI: https://dx.doi.org/10.1016/j.cemconres.2018.12.007
ISSN: 0008-8846
Publisher: Elsevier
Start Page: 23
End Page: 37
Journal / Book Title: Cement and Concrete Research
Volume: 117
Copyright Statement: © 2018 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/
Keywords: 0905 Civil Engineering
1202 Building
Building & Construction
Publication Status: Published
Embargo Date: 2019-12-19
Online Publication Date: 2018-12-19
Appears in Collections:Faculty of Engineering
Civil and Environmental Engineering



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