Control of drying shrinkage in magnesium silicate hydrate (M-S-H) gel mortars
File(s)
Accepted version
Author(s)
Type
Journal Article
Abstract
Magnesium silicate hydrate (M-S-H) gel can be formed by the reaction of MgO with amorphous silica in the presence of sodium hexametaphosphate (Na-HMP). Typical pastes contain 40% MgO and 60% SF and have a w/c ratio of 0.5, but these exhibit shrinkage cracking on drying. The shrinkage characteristics of M-S-H mortar samples containing different additions of sand have been studied using dilatometry. The drying shrinkage was found to decrease with increasing sand addition and to increase with increased water content. Mortars with 60 wt.% sand addition and a w/c ratio of 0.5 had a drying shrinkage of 0.16% and did not show shrinkage cracking. A simple geometrical model based on particle packing is presented that explains the observed changes in drying shrinkage. Based on the geometrical model, the shrinkage of M-S-H mortar system can be reduced to zero when the volume fraction of sand in the mortar is about 0.77.
Date Issued
2016-10-01
Date Acceptance
2016-05-03
Citation
Cement and Concrete Research, 2016, 88 (1), pp.36-42
ISSN
0008-8846
Publisher
Elsevier
Start Page
36
End Page
42
Journal / Book Title
Cement and Concrete Research
Volume
88
Issue
1
Copyright Statement
© 2016, Elsevier. Licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International http://creativecommons.org/licenses/by-nc-nd/4.0/
Identifier
https://www.sciencedirect.com/science/article/pii/S0008884616304744
Subjects
Science & Technology
Technology
Construction & Building Technology
Materials Science, Multidisciplinary
Materials Science
Dispersion
Hydration products
Shrinkage
MgO
Silica fume
PREDICTION
CONCRETE
STRENGTH
CREEP
MODEL
Building & Construction
0904 Chemical Engineering
0905 Civil Engineering
1202 Building
Publication Status
Published
Date Publish Online
2016-06-15