The nucleation of C–S–H via prenucleation clusters

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2023
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Sowoidnich, Thomas
Damidot, Denis
Ludwig, Horst-Michael
Germroth, J.
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The Journal of Chemical Physics. AIP Publishing. 2023, 158(11), 114309. ISSN 0021-9606. eISSN 1089-7690. Available under: doi: 10.1063/5.0141255
Zusammenfassung

The nucleation and growth of calcium–silicate–hydrate (C–S–H) is of fundamental importance for the strength development and durability of the concrete. However, the nucleation process of C–S–H is still not fully understood. The present work investigates how C–S–H nucleates by analyzing the aqueous phase of hydrating tricalcium silicate (C3S) by applying inductively coupled plasma-optical emission spectroscopy as well as analytical ultracentrifugation. The results show that the C–S–H formation follows non-classical nucleation pathways associated with the formation of prenucleation clusters (PNCs) of two types. Those PNCs are detected with high accuracy and reproducibility and are two species of the 10 in total, from which the ions (with associated water molecules) are the majority of the species. The evaluation of the density and molar mass of the species shows that the PNCs are much larger than ions, but the nucleation of C–S–H starts with the formation of liquid precursor C–S–H (droplets) with low density and high water content. The growth of these C–S–H droplets is associated with a release of water molecules and a reduction in size. The study gives experimental data on the size, density, molecular mass, and shape and outlines possible aggregation processes of the detected species.

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ISO 690SOWOIDNICH, Thomas, Denis DAMIDOT, Horst-Michael LUDWIG, J. GERMROTH, Rose ROSENBERG, Helmut CÖLFEN, 2023. The nucleation of C–S–H via prenucleation clusters. In: The Journal of Chemical Physics. AIP Publishing. 2023, 158(11), 114309. ISSN 0021-9606. eISSN 1089-7690. Available under: doi: 10.1063/5.0141255
BibTex
@article{Sowoidnich2023-03-21nucle-66718,
  year={2023},
  doi={10.1063/5.0141255},
  title={The nucleation of C–S–H via prenucleation clusters},
  number={11},
  volume={158},
  issn={0021-9606},
  journal={The Journal of Chemical Physics},
  author={Sowoidnich, Thomas and Damidot, Denis and Ludwig, Horst-Michael and Germroth, J. and Rosenberg, Rose and Cölfen, Helmut},
  note={Article Number: 114309}
}
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