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.

neutron-scattering

silicate

dynamic crossover

glass-transition

model

calcium silicate hydrate

mixtures

cement pastes

temperature-dependence

tricalcium

band dielectric-spectroscopy

Författare

M. Monasterio

Universidad del Pais Vasco/ Euskal Herriko Unibertsitatea

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/ Euskal Herriko Unibertsitatea

Donostia International Physics Center

Journal of Chemical Physics

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

Vol. 139 16 164714

Ämneskategorier

Fysik

DOI

10.1063/1.4826638