However, the resonances were less resolved, and their widths were slightly higher in those cases, showing a lower ordering than with NaOH. Moreover, these resonances were only visible in the most hydrated samples (for total heats above 108 J/g). In both Na2Si1.7O4.4-and Na2CO3activated samples, it was a large band centered at -88.5 ppm that appeared first. This contribution, which was particularly intense for the least hydrated samples, can be assigned to a sum of Q3 environments with some Al incorporation . From these results, it seems that a very amorphous N-A-S-H gel was formed first, giving rise to the resonance at -88.5 ppm.