A H-1 NMR relaxometry investigation of gel-pore drying shrinkage in cement pastes

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Title: A H-1 NMR relaxometry investigation of gel-pore drying shrinkage in cement pastes
Authors: Gajewicz, AM
Gartner, E
Kang, K
McDonald, RI
Yerrnakou, V
Item Type: Journal Article
Abstract: The first systematic study of the temporal evolution of the pore-size-distribution (PSD) in mature cement pastes following one and two cycles of drying and rewetting is presented. The PSD is measured using 1H nuclear magnetic resonance (NMR) relaxometry. For millimetre sized paste samples dried fairly strongly, the volume of water taken up shortly after rewetting slightly exceeds the pre-drying amount. The volume of water in pores > 10 nm far exceeds that in smaller pores. This reverses the situation observed prior to drying. Over subsequent days the water distribution reverts to its original form, so that the dominant fraction is again in the smaller pores. Since the total water content scarcely changes, this indicates a re-arrangement of the nano-scale porosity. Over two drying–rewetting cycles, both reversible and irreversible changes are seen. The effect is not observed in moderately dried pastes.
Issue Date: 5-May-2016
Date of Acceptance: 27-Apr-2016
URI: http://hdl.handle.net/10044/1/38946
DOI: https://dx.doi.org/10.1016/j.cemconres.2016.04.013
ISSN: 1873-3948
Publisher: Elsevier
Start Page: 12
End Page: 19
Journal / Book Title: Cement and Concrete Research
Volume: 86
Copyright Statement: © 2016, Elsevier. Licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International http://creativecommons.org/licenses/by-nc-nd/4.0/
Keywords: Science & Technology
Construction & Building Technology
Materials Science, Multidisciplinary
Materials Science
Building & Construction
0905 Civil Engineering
1202 Building
Publication Status: Published
Appears in Collections:Faculty of Engineering
Civil and Environmental Engineering

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