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Figure 1
X-ray diffraction patterns of all C–S–H samples. From top to bottom, samples are sorted by increasing synthesis time and then by increasing Ca/Si ratio. The inset at the top right is a sketch of the C–S–H structure, with grey polyhedra representing (CaO7)12− polyhedra and red tetrahedra representing (SiO4)4− polyhedra. Two paired Si tetrahedra (two tetrahedra connected, at the surface of the Ca layer) and a bridging Si tetrahedron (bridging two of the aforementioned paired Si) are pointed out with arrows.

Journal logoJOURNAL OF
APPLIED
CRYSTALLOGRAPHY
ISSN: 1600-5767
Volume 50| Part 1| February 2017| Pages 14-21
https://doi.org/10.1107/S1600576716017404
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