Journal
CEMENT AND CONCRETE RESEARCH
Volume 74, Issue -, Pages 116-125Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.cemconres.2015.04.005
Keywords
H-1 NMR; Silica fume; C-S-H composition; Density
Funding
- European Union [264448]
- Danish Strategic Research Council [11-116724]
- Nanocem
- UK Engineering and Physical Sciences Research Council [EP/H033343/1]
- EPSRC [EP/H033343/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/H033343/1] Funding Source: researchfish
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H-1 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-1 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. (C) 2015 Elsevier Ltd. All rights reserved.
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