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Effect of autogenous shrinkage on microcracking and mass transport properties of concrete containing supplementary cementitious materials

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Title: Effect of autogenous shrinkage on microcracking and mass transport properties of concrete containing supplementary cementitious materials
Authors: Yio, MHN
Mac, MJ
Yeow, YX
Wong, H
Buenfeld, NR
Item Type: Journal Article
Abstract: It is well-known that supplementary cementitious materials (SCMs) and low water-to-binder (w/b) ratio increase autogenous shrinkage, but the impact on microcracking and long-term transport properties is less understood. This paper examines the effect of microcracking induced by autogenous shrinkage on transport properties of concretes cured up to ~3.6 years. Variables include SCM type (9% SF, 70% GGBS), w/b ratio (0.20–0.45), maximum-aggregate-size (MSA: 5–20 mm) and shrinkage reducing admixture (SRA). Oxygen diffusivity, permeability and water sorptivity were correlated with microcracks characterised using laser scanning confocal microscopy and 3D X-ray microtomography. Results show greater microcracking in mixes containing SCMs, low w/b ratio and large MSA. At the same w/b ratio and binder type, strong positive correlations are observed between transport and microcracking with increasing MSA, confirming the negative impact of autogenous shrinkage. SRA was effective in reducing these effects. The significance is compared with drying shrinkage and implications for durability are discussed.
Issue Date: 1-Dec-2021
Date of Acceptance: 18-Sep-2021
URI: http://hdl.handle.net/10044/1/92309
DOI: 10.1016/j.cemconres.2021.106611
ISSN: 0008-8846
Publisher: Elsevier
Journal / Book Title: Cement and Concrete Research
Volume: 150
Copyright Statement: © 2021 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
Funder's Grant Number: PITN-GA-2010-264448
Keywords: Science & Technology
Technology
Construction & Building Technology
Materials Science, Multidisciplinary
Materials Science
Shrinkage (C)
Microcracks (B)
Transport properties (C)
Durability (C)
High performance concrete (E)
REDUCING ADMIXTURES
WATER-ABSORPTION
DRYING SHRINKAGE
PORE STRUCTURE
SILICA FUME
MICROSTRUCTURE
PERFORMANCE
STRENGTH
PERMEABILITY
DIFFUSIVITY
0904 Chemical Engineering
0905 Civil Engineering
1202 Building
Building & Construction
Publication Status: Published
Embargo Date: 2022-09-24
Article Number: ARTN 106611
Online Publication Date: 2021-09-25
Appears in Collections:Civil and Environmental Engineering



This item is licensed under a Creative Commons License Creative Commons