Observation of dynamic crossover and dynamic heterogeneity in hydration water confined in aged cement paste

Y. Zhang, M. Lagi, F. Ridi, E. Fratini, P. Baglioni, E. Mamontov, S. H. Chen

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Abstract

High resolution quasi-elastic neutron scattering is used to investigate the slow dynamics of hydration water confined in calcium silicate hydrate gel in an aged cement paste at supercooled temperatures. A super-Arrhenius to Arrhenius dynamic crossover of the average translational relaxation time as a function of the inverse temperature is observed at TL = 231 5K, which coincides with a prominent peak in the differential scanning calorimetry cooling scan. The dynamic susceptibility χT(t) calculated using the experimentally determined temperature dependence of the self-intermediate scattering function shows direct evidence of the enhanced dynamic fluctuations and the associated growth in size of the dynamic heterogeneity in the confined water on approaching TL.

Original languageEnglish
Article number502101
JournalJournal of Physics Condensed Matter
Volume20
Issue number50
DOIs
StatePublished - Dec 17 2008
Externally publishedYes

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