Cause of the fragile-to-strong transition observed in water confined in C-S-H gel
Journal article, 2013

In this study, the rotational dynamics of hydration water confined in calcium-silicate-hydrate (C-S-H) gel with a water content of 22 wt.% was studied by broadband dielectric spectroscopy in broad temperature (110-300 K) and frequency (10(-1)-10(8) Hz) ranges. The C-S-H gel was used as a 3D confining system for investigating the possible existence of a fragile-to-strong transition for water around 220 K. Such transition was observed at 220 K in a previous study [Y. Zhang, M. Lagi, F. Ridi, E. Fratini, P. Baglioni, E. Mamontov and S. H. Chen, J. Phys.: Condens. Matter 20, 502101 (2008)] on a similar system, and it was there associated with a hidden critical point of bulk water. However, based on the experimental results presented here, there is no sign of a fragile-to-strong transition for water confined in C-S-H gel. Instead, the fragile-to-strong transition can be explained by a merging of two different relaxation processes at about 220 K. (C) 2013 AIP Publishing LLC.

neutron-scattering

silicate

dynamic crossover

glass-transition

model

calcium silicate hydrate

mixtures

cement pastes

temperature-dependence

tricalcium

band dielectric-spectroscopy

Author

M. Monasterio

University of the Basque Country (UPV/EHU)

Helen Jansson

Chalmers, Civil and Environmental Engineering, Building Technology

J. J. Gaitero

Tecnalia Research and Innovation

J. S. Dolado

Tecnalia Research and Innovation

S. Cerveny

University of the Basque Country (UPV/EHU)

Donostia International Physics Center

Journal of Chemical Physics

0021-9606 (ISSN) 1089-7690 (eISSN)

Vol. 139 16 164714

Subject Categories

Physical Sciences

DOI

10.1063/1.4826638

More information

Latest update

8/27/2018