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首页> 外文会议>The 5th International Symposium on Cement and Concrete Vol.1 Oct 28-Nov 1, 2002 Shanghai, China >MICROSTRUCTURE OF PORTLAND CEMENT PASTES WITH LOW WATER-CEMENT-RATIOS AFTER LONG-TIME CURING UNDER WATER
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MICROSTRUCTURE OF PORTLAND CEMENT PASTES WITH LOW WATER-CEMENT-RATIOS AFTER LONG-TIME CURING UNDER WATER

机译：水下长期凝结后水胶比低的波特兰水泥浆的微观结构

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摘要

In this research project different Portland cement pastes with low water/cement (w/c) ratios - as used in high performance concretes - were stored under water at 8 C, 20 C and 50 C up to 360 days. Afterwards the samples were investigated with regard to a possible destructive expansion and change in microstructure due to hydration of clinker relicts with water permeated through the surfaces into the specimen. Beside the determination of the length change and compressive strength the following examinations were carried out: Mercury intrusion porosimetry, x-ray powder diffraction, scanning electron microscopy and fluorescence-microscopy. The performed investigations lead to the conclusion that the hydration reaction does not stop by self-desiccation. Water permeates into the specimen and leads to further hydration. Nevertheless there is no visible evidence for the presence of any cracks on the surface or in the bulk of the specimen yet. The compressive strength is not reduced. Possible reaction mechanisms are discussed.
机译：在该研究项目中，高性能混凝土中使用的低水灰比（w / c）的不同波特兰水泥浆在8 C，20 C和50 C的水中存储长达360天。之后，研究了样品的可能破坏性膨胀和由于熟料残渣与水的渗透而引起的微观结构变化，水通过表面渗入样品。除了确定长度变化和抗压强度外，还进行了以下检查：压汞法，X射线粉末衍射法，扫描电子显微镜和荧光显微镜。进行的研究得出结论，水合反应不会因自干燥而停止。水渗透到样品中并导致进一步水化。然而，目前还没有可见的证据表明在样品的表面或大部分中存在任何裂纹。抗压强度没有降低。讨论了可能的反应机理。

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