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Wet chemistry C-S-H precipitation experiments were performed under controlledconditions of solution supersaturation in the presence and absence of gluconateand three hexitol molecules. Characterization of the precipitates with SAXS andcryo-TEM experiments confirmed the presence of a multi-step nucleation pathway.Induction times for the formation of the amorphous C-S-H spheroids weredetermined from light transmittance. Analysis of those data with the classicalnucleation theory revealed a significant increase of the kinetic prefactor inthe same order as the complexation constants of calcium and silicate with eachof the organics. Finally, two distinct precipitation regimes of the C-S-Hamorphous precursor were identified: i) a nucleation regime at low saturationindexes (SI) and ii) a spinodal nucleation regime at high SI where the freeenergy barrier to the phase transition is found to be of the order of thekinetic energy or less.

Mechanisms and kinetics of C-S-H nucleation approaching the spinodal line: Insights into the role of organics additives