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

Gajewicz, AM, Gartner, E, Kang, K, McDonald, PJ and Yermakou, V (2016) A 1H NMR relaxometry investigation of gel-­pore drying shrinkage in cement pastes Cement and Concrete Research, 86. pp. 12-19.

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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.

Item Type: Article
Subjects : subj_Physics
Divisions : Faculty of Engineering and Physical Sciences > Physics
Authors :
AuthorsEmailORCID
Gajewicz, AMUNSPECIFIEDUNSPECIFIED
Gartner, EUNSPECIFIEDUNSPECIFIED
Kang, KUNSPECIFIEDUNSPECIFIED
McDonald, PJUNSPECIFIEDUNSPECIFIED
Yermakou, VUNSPECIFIEDUNSPECIFIED
Date : 5 May 2016
Funders : European Union Seventh Framework Programme
Identification Number : 10.1016/j.cemconres.2016.04.013
Grant Title : FP7/2007–2013
Copyright Disclaimer : © 2016. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/
Related URLs :
Depositing User : Symplectic Elements
Date Deposited : 12 May 2016 08:57
Last Modified : 12 May 2016 08:57
URI: http://epubs.surrey.ac.uk/id/eprint/810681

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