Is cement a glassy material?
Author(s)
Bauchy, M.; Qomi, J. Abdolhosseini; Ulm, Franz-Josef; Pellenq, Roland Jm
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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.
Date issued
2014-03Department
Massachusetts Institute of Technology. Department of Civil and Environmental EngineeringJournal
Computational modelling of concrete structures: proceedings of EURO-C 2014
Publisher
CRC Press
Citation
Bauchy, M. "Is Cement a Glassy Material?" Computational modelling of concrete structures: proceedings of EURO-C 2014, 24-27 March 2014, St. Anton am Arlberg, Austria, CRC Press, 2014.
Version: Author's final manuscript
ISBN
9781315762036