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Dynamic behavior of hydration water in calcium-silicate-hydrate gel: A quasielastic neutron scattering spectroscopy investigation

机译：水合硅酸钙凝胶中水合水的动态行为：准弹性中子散射光谱研究

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摘要

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.
机译：通过准弹性中子散射光谱研究了温度范围为280至230 K的水合硅酸钙（CSH）凝胶水化动力学。根据松弛笼模型，通过低Q谱分析获得了从固定水分子p（Q）的弹性分数中提取的约束半径α的时间依赖性。使用C-S-H对三种不同的水含量（10％，17％和30％）进行了测量。在三个不同含水量的C-S-H凝胶样品中，β的值随含水量的增加而减小，而α则增加。对于两个较低的水含量，D和〈τ〉的值对温度不敏感，与观察到轻微变化的30％情况相反。违反斯托克斯-爱因斯坦关系的趋势仅在含水量为30％的情况下可见。

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