University of Surrey

Test tubes in the lab Research in the ATI Dance Research

Water Redistribution-Microdiffusion in Cement Paste Under Mechanical Loading Evidenced by 1H NMR

Wyrzykowski, Mateusz, Gajewicz-Jaromin, Agata, McDonald, Peter J, Dunstan, David J, Scrivener, Karen L. and Lura, Pietro (2019) Water Redistribution-Microdiffusion in Cement Paste Under Mechanical Loading Evidenced by 1H NMR The Journal of Physical Chemistry C.

[img] Text
Water Redistribution-Microdiffusion in Cement Paste under Mechanical Loading Evidenced by 1H NMR.docx - Accepted version Manuscript
Restricted to Repository staff only until 8 June 2020.

Download (365kB)
[img] Text (Supporting Information)
Water Redistribution-Microdiffusion in Cement Paste under Mechanical Loading Evidenced by 1H NMR - sup mat.docx - Supplemental Material
Restricted to Repository staff only until 8 June 2020.

Download (516kB)

Abstract

The mobility of water within the microstructure of hardened cement paste has been at the center of a long-lasting debate, motivated by the need to understand the fundamental mechanisms that play a role in drying, shrinkage, creep and thermal expansion. Our 1H NMR results show for the first time that externally-applied pressure can lead to migration of water within the microstructure (microdiffusion). Upon compression, the gel water signal decreases. For the most part, this is accommodated by a corresponding increase in the signal of water in larger, interhydrate and capillary spaces. However, there is also an increase in the signal corresponding to the water in most confined spaces. Normally such tiny spaces are classified as hydrate interlayers. However, we do not conclude that there is a significant increase in interlayer water. Rather we attribute this part of the increase to a rearrangement of the microstructure upon compression with some water confined in increasingly small gel pore spaces. These findings show that the deformability of the microstructure (C-S-H gel) at the expense of gel porosity may explain part of the macroscopic deformations due to short-term creep.

Item Type: Article
Divisions : Faculty of Engineering and Physical Sciences > Physics
Authors :
NameEmailORCID
Wyrzykowski, Mateusz
Gajewicz-Jaromin, AgataAgata.Gajewicz@surrey.ac.uk
McDonald, Peter JP.Mcdonald@surrey.ac.uk
Dunstan, David J
Scrivener, Karen L.
Lura, Pietro
Date : 7 June 2019
DOI : 10.1021/acs.jpcc.9b02436
Copyright Disclaimer : © 2019 American Chemical Society
Depositing User : Clive Harris
Date Deposited : 18 Jun 2019 08:55
Last Modified : 18 Jun 2019 08:55
URI: http://epubs.surrey.ac.uk/id/eprint/852039

Actions (login required)

View Item View Item

Downloads

Downloads per month over past year


Information about this web site

© The University of Surrey, Guildford, Surrey, GU2 7XH, United Kingdom.
+44 (0)1483 300800