Compositional Evolution of Calcium Silicate Hydrate (C-S-H) Structures by Total X-Ray Scattering

Sezen Soyer-Uzun, Sejung Rosie Chae, Chris J. Benmore, Hans-Rudolf Wenk, Paulo J. M. Monteiro

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High-energy X-ray diffraction was employed to study the structural characteristics of a set of C-S-H samples with 0.6 ≤ C/S a;circ 1.75. It has been observed that Si is tetrahedrally coordinated to O for all samples irrespective of chemical composition and the Ca-O coordination number gradually decreases from ∼7 to ∼6 with increasing C/S ratio. This suggests that the C-S-H structure evolves from a tobermorite-like structure into a jennite-like structure as a function of increasing C/S ratio as the interlayer space decreases from ∼1.3 to ∼1 nm. Evolution of these short- and medium-range order structural characteristics in the C-S-H system is associated with the alteration of the Ca-O layers and silicate depolymerization with increasing C/S. © 2011 The American Ceramic Society.
Original languageEnglish (US)
Pages (from-to)793-798
Number of pages6
JournalJournal of the American Ceramic Society
Issue number2
StatePublished - Dec 9 2011
Externally publishedYes

Bibliographical note

KAUST Repository Item: Exported on 2020-10-01
Acknowledged KAUST grant number(s): KUS-11-004021
Acknowledgements: This publication was based on the work supported in part by Award No. KUS-11-004021, made by King Abdullah University of Science and Technology (KAUST). The work at Argonne National Laboratory was supported by the US Department of Energy, Office of Science, Office of Basic Energy Sciences, under Contract No. DE-AC02-06CH11357.
This publication acknowledges KAUST support, but has no KAUST affiliated authors.


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