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The mechanism of water–isopropanol exchange in cement pastes evidenced by NMR relaxometry

Kowalczyk, R. M., Gajewicz, A. M. and McDonald, P. J. (2014) The mechanism of water–isopropanol exchange in cement pastes evidenced by NMR relaxometry. RSC Advances, 4. pp. 20709-20715. ISSN 2046-2069

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To link to this item DOI: 10.1039/C4RA00889H

Abstract/Summary

1H nuclear magnetic resonance (NMR) relaxometry shows that arresting the hydration of cement paste by isopropanol exchange does not involve simple replacement of the pore water with isopropanol. Isopropanol fills capillary voids. It removes and replaces the water in the calcium-silicate-hydrate (C-S-H) interhydrate pores. In the C-S-H gel pores, the isopropanol draws water out, but does not replace it to the same extent. The exchange has only a minor impact on C-S-H interlayer water. The connectivity of the interlayer-gel network and interhydrate pores and capillary voids is evidenced by proton–deuteron chemical exchange in the C-S-H pore structure which is observed experimentally for the first time. Isopropanol also reveals the presence of large capillary voids that are not detected in samples saturated with water.

Item Type:Article
Refereed:Yes
Divisions:Interdisciplinary centres and themes > Chemical Analysis Facility (CAF)
ID Code:69409
Publisher:Royal Society of Chemistry

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