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首页> 外文会议>Proceedings of International Kunming Symposium on Microscopy July 2-5, 2000 Kunming, Yunnan Province, China >HREM study of nanostructure of calcium silicate hydrate gels in cement paste
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HREM study of nanostructure of calcium silicate hydrate gels in cement paste

机译：水泥浆中硅酸钙水合物凝胶纳米结构的HREM研究

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摘要

Calcium silicate hydrate (C-S-H) Gel is the principal reaction product of Portland cement and water. However, a precise structure of C-S-H is not determined yet due to the lack of long-range crystallinity. C-S-H is believed to be nearly amorphous (i.e. gel-like). It is found that the Ca:Si ratio of C-S-H varies with the area measured, with the value from 0.6 to 2, but its average Ca:Si ratio is approx 1.7. Many models have been proposed to expalin the complex C-S-H gel structure and its Ca:Si ratio fluctuations. The solid solution model, considers C-S-H as a solid solution between tobermorite and calcium hydroxide. This model can explain some of the crystal chemical observation of C-S-H, however it is not clear if the model could be extended to the higher limits of local Ca:Si ratios (>2.0) that are observed in the C-S-H gel phase. The nanophasic model considers C-S-H to consist of a mixture of tobemorite and jennite structural elements on the nanometer scale. This model can explain many of the crystal chemical observation, in particular, it accounts for the importance of the presence of strong fluctuations in the local Ca:Si ratio. However, the model requires that C-S-H is a nanoheterogeneous system.
机译：水合硅酸钙（C-S-H）凝胶是波特兰水泥与水的主要反应产物。但是，由于缺乏长程结晶性，所以尚未确定C-S-H的精确结构。据信C-S-H几乎是无定形的（即凝胶状的）。发现C-S-H的Ca：Si比随所测量的面积而变化，其值为0.6至2，但是其平均Ca：Si比为约1.7。已经提出了许多模型来解释复杂的C-S-H凝胶结构及其Ca：Si比波动。固溶体模型将C-S-H视为雪铁矿和氢氧化钙之间的固溶体。该模型可以解释C-S-H的某些晶体化学观察，但是尚不清楚该模型是否可以扩展到在C-S-H凝胶相中观察到的局部Ca：Si比（> 2.0）的上限。纳米相模型认为C-S-H在纳米尺度上由膨润土和假晶石结构元素的混合物组成。该模型可以解释许多晶体化学观察，特别是它说明了局部Ca：Si比存在强烈波动的重要性。但是，该模型要求C-S-H是纳米异质系统。

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