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![[Figure 4]](po5053fig4mag.jpg)
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Figure 4
29Si MAS NMR spectra acquired on C–S–H samples synthesized at 323 K (a) and 443 K (b), and evolution of the Q2 chemical shift as a function of sample Ca/Si ratio (c). In (a) and (b), spectra are sorted, from top to bottom, by decreasing Ca/Si ratio and dashed vertical lines show the approximate position of, from left to right, Si Q1, Q2 and Q3 environments. The inset in (a) points, with the example of CSH 1.4–323 K, to the appearance of a shoulder on the resonance of the Q2 environment when the Ca/Si ratio increases. In (c), samples synthesized at room temperature, 353 K, 323 K and 443 K are, respectively, shown as up and down triangles, squares and dots. |
![[Figure 4]](po5053fig4.jpg)
 | JOURNAL OF APPLIED CRYSTALLOGRAPHY |
ISSN: 1600-5767
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