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Is cement a glassy material?

TitleIs cement a glassy material?
Publication TypeConference Proceedings
Year of Publication2015
AuthorsBauchy M, Qomi M J A, Pellenq RJean-Marc, Ulm F-J
EditorBicanic N, Mang H, Meschke G, DeBorst R
Conference NameEuro-C Conference
VolumeCOMPUTATIONAL MODELLING OF CONCRETE STRUCTURES, VOL 1
Pagination169-176
Date PublishedJun-22-2015
PublisherCRC PRESS-TAYLOR & FRANCIS GROUP
Conference LocationMAR 24-27, 2014, St Anton am Alberg, AUSTRIA
ISBN Number978-1-138-02641-4; 978-1-315-76203-6
Abstract

The nature of Calcium-Silicate-Hydrate (C-S-H), the binding phase of cement, remains a controversial question. In particular, contrary to the former crystalline model, it was recently proposed that its nanoscale structure was actually amorphous. To elucidate this issue, we analyzed the structure of a realistic simulation of C-S-H, and compared the latter to crystalline tobermorite, a natural analogue to cement, and to an artificial ideal glass. Results clearly support that C-S-H is amorphous. However, its structure shows an intermediate degree of order, retaining some characteristics of the crystal while acquiring an overall glass-like disorder. Thanks to a detailed quantification of order and disorder, we show that its amorphous state mainly arises from its hydration.

DOI10.1201/b16645-19
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