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Influence of silica fume on the microstructure of cement pastes: New insights from H NMR relaxometry

Muller, ACA, Scrivener, KL, Skibsted, J, Gajewicz, AM and McDonald, PJ (2015) Influence of silica fume on the microstructure of cement pastes: New insights from H NMR relaxometry Cement and Concrete Research, 74. pp. 116-125.

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Abstract

H NMR has been used to characterise white Portland cement paste incorporating 10 wt.% of silica fume. Samples were measured sealed throughout the hydration without sample drying. Paste compositions and C-S-H characteristics are calculated based on H NMR signal intensities and relaxation analysis. The results are compared with a similar study of plain white cement paste. While the presence of silica fume has little influence on C-S-H densities, the chemical composition is impacted. After 28 days of sealed hydration, the Ca/(Si + Al) ratio of the C-S-H is 1.33 and the H2O(Si + Al) ratio is 1.10 when 10% of silica fume is added to the white cement. A densification of the C-S-H with time is observed. There are no major changes in capillary, C-S-H gel and interlayer pore sizes for the paste containing silica fume compared to the plain white cement paste. However, the gel/interlayer water ratio increases in the silica fume blend.

Item Type: Article
Divisions : Faculty of Engineering and Physical Sciences > Physics
Authors :
AuthorsEmailORCID
Muller, ACAUNSPECIFIEDUNSPECIFIED
Scrivener, KLUNSPECIFIEDUNSPECIFIED
Skibsted, JUNSPECIFIEDUNSPECIFIED
Gajewicz, AMUNSPECIFIEDUNSPECIFIED
McDonald, PJUNSPECIFIEDUNSPECIFIED
Date : 1 August 2015
Identification Number : 10.1016/j.cemconres.2015.04.005
Additional Information : This is an open access publication published under a Creative Commons 4.0 Licence
Depositing User : Symplectic Elements
Date Deposited : 19 Jun 2015 16:13
Last Modified : 23 Jun 2015 14:47
URI: http://epubs.surrey.ac.uk/id/eprint/807918

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