Cause of the fragile-to-strong transition observed in water confined in C-S-H gel
Artikel i vetenskaplig tidskrift, 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.

silicate

temperature-dependence

cement pastes

dynamic crossover

neutron-scattering

mixtures

band dielectric-spectroscopy

calcium silicate hydrate

glass-transition

tricalcium

model

Författare

M. Monasterio

Universidad del Pais Vasco

Helen Jansson

Chalmers, Bygg- och miljöteknik, Byggnadsteknologi

J. J. Gaitero

Tecnalia Research and Innovation

J. S. Dolado

Tecnalia Research and Innovation

S. Cerveny

Universidad del Pais Vasco

Donostia International Physics Center

Journal of Chemical Physics

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

Vol. 139 164714

Ämneskategorier

Fysik

DOI

10.1063/1.4826638