Research Article
Microstructural Study of Hydration of C3S in the Presence of Calcium Nitrate Using Scanning Transmission X-Ray Microscopy (STXM)
Table 2
29Si MAS NMR analysis for hydrated C3S paste at 25°C for hydration period of 1, 3, 7, and 28 days.
| | Samples | | Percentage of integral intensities of (%) | |
-74 ppm |
-78 ppm |
-83 ppm |
-89 ppm |
| | C3S_1 d | 33.2 | 64.4 | 2.4 | — | 0.04 | | C3S_3 d | 20.7 | 43.2 | 30.6 | 5.5 | 0.71 | | C3S_7 d | 11.5 | 37.2 | 43.9 | 7.4 | 1.18 | | C3S_28 d | 11.9 | 14.4 | 53.8 | 20.0 | 3.74 | | C3S+Ca(NO3)2_1 d | 15.2 | 36.1 | 40.1 | 8.6 | 1.11 | | C3S+Ca(NO3)2_3 d | 6.5 | 34.1 | 46.5 | 12.9 | 1.37 | | C3S+Ca(NO3)2_7 d | 1.0 | 38.7 | 37.3 | 23.0 | 0.97 | | C3S+Ca(NO3)2_28 d | 3.7 | 22.3 | 52.6 | 21.4 | 2.36 |
|
|
