Thus, it can be assumed that the dissolution of Al and Si followed the same kinetics. If this hypothesis is applied to Na2Si1.7O4.4-activated cements, it seems that DOHSi' gives better values for the first two stops but not for the last one, where DOHSi is closer to DOHAl. This result can seem quite surprising. However, it should be reminded that the hydration of the samples was stopped by first washing them twice with pure water. This led to a loss of some of the silicates coming from the activator, and that had not reacted yet.