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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Claret, Francis
Bureau de Recherches Géologiques et Minières
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (16/16 displayed)
- 2024Water dynamics in calcium silicate hydrates probed by inelastic neutron scattering and molecular dynamics simulationscitations
- 2023How much water is there within calcium silicate hydrates? Probing water dynamics by Inelastic Neutron Scattering and Molecular Dynamics Simulations
- 2022Modelling of the long-term evolution and performance of engineered barrier systemcitations
- 2022MODELLING OF THE LONG TERM EVOLUTION AND PERFORMANCE OF ENGINEERED BARRIER SYSTEM
- 2020Contribution of the results of the CEBAMA project to decrease uncertainties in the Safety Case and Performance Assessment of radioactive waste repositoriescitations
- 2017Evidence of (Ca, Mg) smectite formation at Clay/cement interfaces
- 2017In situ interactions between Opalinus Clay and Low Alkali Concretecitations
- 2017In-situ determination of the kinetics and mechanisms of nickel adsorption by nanocrystalline vernaditecitations
- 2017Modelling of the COx/glass interactions: case of the long term MVE experiment
- 2017Minerals paragenesis in hydrated cement paste seen by diffraction tomography
- 2015Structural defects in layered structures: Their determination and their impact on reactivity
- 2014Effects of charging on the chromophores of dissolved organic matter from the Rio Negro basincitations
- 2014Constraints from sulfur isotopes on the origin of gypsum at concrete/claystone interfacescitations
- 2013X-ray diffraction: a powerful tool to probe and understand the structure of nanocrystalline calcium silicate hydratescitations
- 2013On the nature of structural disorder in calcium silicate hydrates with a calcium/silicon ratio similar to tobermoritecitations
- 2012Heterogeneous formation of ferric oxide nanoparticles on chlorite surfaces studied by x-ray absorption spectromicroscopy (STXM)citations
Places of action
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article
X-ray diffraction: a powerful tool to probe and understand the structure of nanocrystalline calcium silicate hydrates
Abstract
X-ray diffraction (XRD) patterns were calculated and compared to literature data with the aim of investigating the crystal structure of nanocrystalline calcium silicate hydrates (C-S-H), the main binding phase in hydrated Portland cement pastes. Published XRD patterns from C-S-H of Ca/Si ratios ranging from similar to 0.6 to similar to 1.7 are fully compatible with nanocrystalline and turbostratic tobermorite. Even at a ratio close or slightly higher than that of jennite (Ca/Si = 1.5) this latter mineral, which is required in some models to describe the structure of C-S-H, is not detected in the experimental XRD patterns. The 001 basal reflection from C-S-H, positioned at similar to 13.5 angstrom when the C-S-H structural Ca/Si ratio is low (< 0.9), shifts towards smaller d values and sharpens with increasing Ca/Si ratio, to reach similar to 11.2 angstrom when the Ca/Si ratio is higher than 1.5. Calculations indicate that the sharpening of the 001 reflection may be related to a crystallite size along c* (i.e. a mean number of stacked layers) increasing with the C-S-H Ca/Si ratio. Such an increase would contribute to the observed shift of the 001 reflection, but fails to quantitatively explain it. It is proposed that the observed shift could result from interstratification of at least two tober-morite-like layers, one having a high and the other a low Ca/Si ratio with a basal spacing of 11.3 and 14 angstrom, respectively.