Dynamic behavior of hydration water in calcium-silicate-hydrate gel: A quasielastic neutron scattering spectroscopy investigation
Name
Li-2012-Dynamic behavior of hydration water in calcium-silicate-hydrate gel.pdf
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Author(s)
Li, Hua
Fratini, Emiliano
Chiang, Wei-Shan
Baglioni, Piero
Mamontov, Eugene
Chen, Sow-Hsin
Date Issued
December 2012
Journal
Physical Review E
Publisher
American Physical Society
Citation
Li, Hua et al. “Dynamic Behavior of Hydration Water in Calcium-silicate-hydrate Gel: A Quasielastic Neutron Scattering Spectroscopy Investigation.” Physical Review E 86.6 (2012). ©2012 American Physical Society
Version
Final published version
Abstract
The translational dynamics of hydration water confined in calcium-silicate-hydrate (C-S-H) gel was studied by quasielastic neutron scattering spectroscopy in the temperature range from 280 to 230 K. The stretch exponent β, the self-diffusion constant D, the average translational relaxation time 〈τ〉, and the temperature dependence of confinement radius α extracted from the elastic fraction of immobile water molecules p(Q) were obtained from the analyses of the low-Q spectra according to the relaxing cage model. Measurements were made using C-S-H of three different water contents, 10%, 17%, and 30%. Among the three samples of C-S-H gel with different water contents, the values of β decrease with increasing water contents, while α increases. The values of D and 〈τ〉 are insensitive to temperature for the two lower water contents, as opposed to the 30% case where a slight variation is observed. The trend for violation of the Stokes-Einstein relation is only visible in the case of 30% water content.
MIT Department
Massachusetts Institute of Technology. Department of Nuclear Science and Engineering
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DOI of Published Version
https://doi.org/10.1103/PhysRevE.86.061505
