期刊
JOURNAL OF APPLIED CRYSTALLOGRAPHY
卷 50, 期 -, 页码 14-21出版社
INT UNION CRYSTALLOGRAPHY
DOI: 10.1107/S1600576716017404
关键词
C-S-H; calcium silicate hydrates; pair distribution function; transmission electron microscopy
资金
- French National Research Agency (ANR) [ANR-14-CE01-0006]
- Agence Nationale de la Recherche (ANR) [ANR-14-CE01-0006] Funding Source: Agence Nationale de la Recherche (ANR)
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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