Study on Hydration Process of Portland Cement by Helium Pycnometry

被引：0
|
作者：
Sun Z. [1 ,2 ]
Zhang C. [1 ,2 ]
Yang X. [1 ,2 ]
Ge H. [1 ,2 ]
Setzer M.J. [3 ]
机构：
[1] Key Laboratory of Advanced Civil Engineering Materials of Ministry of Education, Tongji University, Shanghai
[2] School of Materials Science and Engineering, Tongji University, Shanghai
[3] Duisburg-Essen University, Essen
来源：
Jianzhu Cailiao Xuebao/Journal of Building Materials | 2019年 / 22卷 / 04期
关键词：
Absolute volume change; Cement; Helium pycnometry; Hydration process;
D O I：
10.3969/j.issn.1007-9629.2019.04.017
中图分类号：
学科分类号：
摘要：
The absolute volume change of cement paste in cement hydration process was measured by helium pycnometry. Based on the absolute volume change curve of cement paste, hydration process of Portland cement can be divided into 4 stages, i.e. flash shrinkage stage, shrinkage suspension stage, fast shrinkage stage and shrinkage slowdown stage. Obvious absolute volume change of cement paste occurred in flash shrinkage stage and fast shrinkage stage, and the change ranges were huge, due to the hydration of C3A and C3S. The absolute volume change of cement paste kept decreasing linearly with a very slow rate in shrinkage suspension stage, and its mechanism seems to fit the saturation theory. Differently, there came up "inflation" illusion on the absolute volume change curve of cement paste in shrinkage slowdown stage, and the curve can not reflect the real absolute volume change of cement paste any more. However, this phenomenon was closely related to the development of the pore structure of cement paste, which was important for the characterization of cement hydration behavior. Water-cement ratio can affect not only the hydration process of Portland cement, but also the absolute volume change of cement paste in each hydration stage. © 2019, Editorial Department of Journal of Building Materials. All right reserved.
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页码：617 / 625
页数：8
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