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水泥水化和温度对水泥浆触变性的影响

The Influences of Cement Hydration and Temperature on the Thixotropy of Cement Paste.

作者信息

Link Julian, Sowoidnich Thomas, Pfitzner Christopher, Gil-Diaz Teba, Heberling Frank, Lützenkirchen Johannes, Schäfer Thorsten, Ludwig Horst-Michael, Haist Michael

机构信息

Institute for Building Materials Science, Leibniz University Hannover, Appelstraße 9a, 30167 Hannover, Germany.

F.A. Finger-Insitute for Building Materials, Bauhaus University Weimar, Coudraystrasse 11, 99423 Weimar, Germany.

出版信息

Materials (Basel). 2020 Apr 15;13(8):1853. doi: 10.3390/ma13081853.

DOI:10.3390/ma13081853
PMID:32326474
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC7215761/
Abstract

The rheological properties of fresh cement paste are highly influenced by a large number of parameters, among which the most important factors are the applied shear stress, and the shear history, the age of the sample and the temperature. The effects of these parameters on the yield stress (designated as structural limit stress in this work), the viscosity and the structural recovery rate (i.e., the change in dynamic viscosity with time at rest) were studied. In parallel, the changes in ion composition of the carrier liquid, mineral phase content and granulometry were investigated. The results reveal that all investigated rheological parameters exhibit an approximated bi-linear trend with respect to the degree of hydration, with a period of quasi-constant properties until a degree of hydration of approximately 0.07, followed by a non-linear increase. This increase could be attributed to the formation of calcium hydroxide (CH) and calcium-silicate-hydrate (C-S-H) via calorimetry results. With regard to the effect of the shear history of the sample on the rheological properties, the structural limit stress showed a minor dependency on the shear history immediately after the end of shearing, which, however, vanished within the first minute at rest. The same is true for the structural recovery rate. The presented results give detailed insights into the influences of hydration and shear on the rheological properties-especially the thixotropy-of fresh cement pastes.

摘要

新鲜水泥浆体的流变特性受到大量参数的高度影响，其中最重要的因素是施加的剪切应力、剪切历史、样品的龄期和温度。研究了这些参数对屈服应力（在本工作中称为结构极限应力）、粘度和结构恢复率（即静止时动态粘度随时间的变化）的影响。同时，研究了载液离子组成、矿物相含量和粒度的变化。结果表明，所有研究的流变参数相对于水化程度都呈现出近似的双线性趋势，在水化程度约为0.07之前有一段性质近似恒定的时期，随后呈非线性增加。通过量热法结果可知，这种增加可归因于氢氧化钙（CH）和硅酸钙水合物（C-S-H）的形成。关于样品的剪切历史对流变特性的影响，结构极限应力在剪切结束后立即对剪切历史表现出较小的依赖性，但在静止的第一分钟内这种依赖性就消失了。结构恢复率也是如此。所呈现的结果详细揭示了水化和剪切对新鲜水泥浆体流变特性尤其是触变性的影响。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/640e/7215761/c53e55d0ee4e/materials-13-01853-g014.jpg
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Relating Ettringite Formation and Rheological Changes during the Initial Cement Hydration: A Comparative Study Applying XRD Analysis, Rheological Measurements and Modeling.关于初始水泥水化过程中钙矾石的形成与流变学变化：应用X射线衍射分析、流变学测量与建模的比较研究
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