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Water Redistribution within the Microstructure of Cementitious Materials due to Temperature Changes Studied with 1H NMR

Wyrzykowski, M, McDonald, Peter, Scrivener, KL and Lura, P (2017) Water Redistribution within the Microstructure of Cementitious Materials due to Temperature Changes Studied with 1H NMR Journal of Physical Chemistry C, 121 (50). pp. 27950-27962.

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Abstract

Changes of water state within the pore structure of cement paste due to temperature changes are followed by means of 1H-proton nuclear magnetic resonance (NMR) relaxation analysis. The study shows that with increasing temperature, the signal due to water contained in the smallest C-S-H interlayer spaces decreases while that from the larger gel pores, and to a lesser extent from the capillary pores, increases. On cooling, the opposite behavior is observed with complete reversibility. The observed changes in water populations appear to be instantaneous compared to the rate of temperature change in the samples. These changes are postulated to be responsible for macroscopically observed changes of relative humidity in pores during heating/cooling and are therefore key in understanding thermal deformations of cement based materials. It is evident that the previous hypothesis of microstructural delayed water transport being responsible for macrostructural delayed thermal deformations can be rejected. Different microstructural mechanisms are discussed that could explain the redistribution in water signals, namely water migration and pore rearrangement mechanisms.

Item Type: Article
Divisions : Faculty of Engineering and Physical Sciences > Physics
Authors :
NameEmailORCID
Wyrzykowski, M
McDonald, PeterP.Mcdonald@surrey.ac.uk
Scrivener, KL
Lura, P
Date : 21 November 2017
Identification Number : 10.1021/acs.jpcc.7b08141
Copyright Disclaimer : © 2017 American Chemical Society. ACS AuthorChoice - This is an open access article published under a Creative Commons Attribution (CC-BY) License, which permits unrestricted use, distribution and reproduction in any medium, provided the author and source are cited.
Depositing User : Melanie Hughes
Date Deposited : 29 Nov 2017 15:25
Last Modified : 15 May 2018 14:46
URI: http://epubs.surrey.ac.uk/id/eprint/845066

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