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Article Dans Une Revue Journal of Applied Crystallography Année : 2017

Quantitative X-ray pair distribution function analysis of nanocrystalline calcium silicate hydrates: a contribution to the understanding of cement chemistry

Résumé

The structural evolution of nanocrystalline calcium silicate hydrate (C-S-H) as a function of its calcium to silicon (Ca/Si) ratio has been probed using qualitative and quantitative X-ray atomic pair distribution function analysis of synchrotron X-ray scattering data. Whatever the Ca/Si ratio, the C-S-H structure is similar to that of tobermorite. When the Ca/Si ratio increases from similar to 0.6 to similar to 1.2, Si wollastonite-like chains progressively depolymerize through preferential omission of Si bridging tetrahedra. When the Ca/Si ratio approaches similar to 1.5, nanosheets of portlandite are detected in samples aged for 1 d, while microcrystalline portlandite is detected in samples aged for 1 year. High-resolution transmission electron microscopy imaging shows that the tobermorite-like structure is maintained to Ca/Si > 3

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Chimie
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Dates et versions

hal-01691852 , version 1 (24-01-2018)

Identifiants

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Sylvain Grangeon, Alejandro Fernandez-Martinez, Alain Baronnet, Nicolas C.M. Marty, Agnieszka Poulain, et al.. Quantitative X-ray pair distribution function analysis of nanocrystalline calcium silicate hydrates: a contribution to the understanding of cement chemistry. Journal of Applied Crystallography, 2017, 50, pp.14-21. ⟨10.1107/S1600576716017404⟩. ⟨hal-01691852⟩
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