Transport properties of concrete after drying-wetting regimes to elucidate the effects of moisture content, hysteresis and microcracking

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Title: Transport properties of concrete after drying-wetting regimes to elucidate the effects of moisture content, hysteresis and microcracking
Authors: Wu, Z
Wong, HS
Buenfeld, NR
Item Type: Journal Article
Abstract: Drying and wetting induce a number of microstructural changes that could impact transport properties and durability of concrete structures, but their significance is not well-established. This research examines pastes, mortars and concretes with different w/b ratios, binders, aggregate sizes, curing and conditioning regimes. 50 mm thick samples were dried to equilibrium at either 105 °C, 50 °C/7% RH, 21 °C/33% RH or gentle stepwise at 21 °C/93% RH → 3% RH, and then rewetted stepwise by humidification at 21 °C/33% RH → 86% RH and full saturation to produce varying degrees of damage and moisture content. Oxygen diffusivity and permeability, electrical conductivity, microcracking, accessible and total porosity were measured at different conditioning stages over 3-year period to better understand the effects of shrinkage, hysteresis and drying-induced damage on transport properties. The effect of supplementary cementitious materials (GGBS, SF) and implications of drying-wetting on concrete durability are discussed.
Issue Date: 9-May-2017
Date of Acceptance: 13-Apr-2017
URI: http://hdl.handle.net/10044/1/48134
DOI: https://dx.doi.org/10.1016/j.cemconres.2017.04.006
ISSN: 1873-3948
Publisher: Elsevier
Start Page: 136
End Page: 154
Journal / Book Title: Cement and Concrete Research
Volume: 98
Copyright Statement: © 2017 Elsevier Ltd. All rights reserved. This manuscript is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International http://creativecommons.org/licenses/by-nc-nd/4.0/
Keywords: Science & Technology
Technology
Construction & Building Technology
Materials Science, Multidisciplinary
Materials Science
Shrinkage
Microcracks
Transport properties
Durability
Hysteresis
Drying-wetting
HARDENED CEMENTITIOUS MATERIALS
VAPOR SORPTION EXPERIMENTS
SATURATED SALT-SOLUTIONS
C-S-H
PORE STRUCTURE
ELECTRON-MICROSCOPY
WATER PERMEABILITY
HYDRATED CEMENT
ESSENTIAL TOOL
PASTE
Building & Construction
0905 Civil Engineering
1202 Building
Publication Status: Published
Appears in Collections:Faculty of Engineering
Civil and Environmental Engineering



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