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Mechanisms and kinetics of C-S-H nucleation approaching the spinodal line: Insights into the role of organics additives
- Source :
- Cement and Concrete Research, 173, 2023, 107299
- Publication Year :
- 2023
-
Abstract
- Wet chemistry C-S-H precipitation experiments were performed under controlled conditions of solution supersaturation in the presence and absence of gluconate and three hexitol molecules. Characterization of the precipitates with SAXS and cryo-TEM experiments confirmed the presence of a multi-step nucleation pathway. Induction times for the formation of the amorphous C-S-H spheroids were determined from light transmittance. Analysis of those data with the classical nucleation theory revealed a significant increase of the kinetic prefactor in the same order as the complexation constants of calcium and silicate with each of the organics. Finally, two distinct precipitation regimes of the C-S-H amorphous precursor were identified: i) a nucleation regime at low saturation indexes (SI) and ii) a spinodal nucleation regime at high SI where the free energy barrier to the phase transition is found to be of the order of the kinetic energy or less.<br />Comment: Accepted in Cement and Concrete Research. 30 pages plus supplementary materials. arXiv admin note: substantial text overlap with arXiv:2111.02743
- Subjects :
- Condensed Matter - Materials Science
Physics - Chemical Physics
Subjects
Details
- Database :
- arXiv
- Journal :
- Cement and Concrete Research, 173, 2023, 107299
- Publication Type :
- Report
- Accession number :
- edsarx.2308.02247
- Document Type :
- Working Paper
- Full Text :
- https://doi.org/10.1016/j.cemconres.2023.107299