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

被引：74

作者：

Grangeon, Sylvain ^{[1
]}

Fernandez-Martinez, Alejandro ^{[2
,3
]}

Baronnet, Alain ^{[4
,5
]}

Marty, Nicolas ^{[1
]}

Poulain, Agnieszka ^{[6
]}

Elkaim, Erik ^{[7
]}

Roosz, Cedric ^{[8
]}

Gaboreau, Stephane ^{[1
]}

Henocq, Pierre ^{[8
]}

Claret, Francis ^{[1
]}

机构：

[1] BRGM French Geol Survey, SVP, D3F, 3 Ave Claude Guillemin, F-45060 Orleans, France

[2] CNRS, ISTerre, F-38041 Grenoble, France

[3] Univ Grenoble Alpes, F-38041 Grenoble, France

[4] Univ Aix Marseille, CINaM UMR 7325, F-13288 Marseille, France

[5] CNRS, CINaM UMR 7325, F-13288 Marseille, France

[6] European Synchrotron, ESRF, 71 Ave Martyrs, F-38000 Grenoble, France

[7] LOrme Merisiers St Aubin, Synchrotron Soleil, BP 48, F-91192 Gif Sur Yvette, France

[8] Andra, Sci Div, 1-7 Rue Jean Monnet,Parc Croix Blanche, F-92298 Chatenay Malabry, France

来源：

JOURNAL OF APPLIED CRYSTALLOGRAPHY | 2017年 / 50卷

关键词：

C-S-H; calcium silicate hydrates; pair distribution function; transmission electron microscopy; C-S-H; TRANSMISSION ELECTRON-MICROSCOPY; TRICALCIUM SILICATE; CELL DIMENSIONS; PORTLAND-CEMENT; SOLID-SOLUTIONS; REAL STRUCTURE; TEMPERATURE; MODEL; DIFFRACTION;

D O I：

10.1107/S1600576716017404

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

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.

引用

页码：14 / 21

页数：8

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