Field experiences in concrete deterioration by thaumasite formation: possibilities and problems in thaumasite analysis
Field experiences in concrete deterioration by thaumasite formation: possibilities and problems in thaumasite analysis
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DOI：
10.1016/s0958-9465(03)00135-5
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发表时间：
2003-12-01
影响因子：
10.5
通讯作者：
Berninger, AM
中科院分区：
文献类型：
--
作者：
Freyburg, E;Berninger, AM
在德国，在测试了两个因形成钙铝石而变质的混凝土后，将讨论分析铝镁石和含钙矾石的混凝土样品的可能性和问题。抛光薄片的图像显示，硅铝榴石的形成导致了类似钙矾石的微观结构。在显微结构中可以看出，硅铝榴石的形成也是通过CSH相的退化和钙矾石的分解来实现的。使用环境扫描电子显微镜鉴定硅铝石是可能的，没有问题。X射线粉末衍射法的研究表明，用Rietveld法定量分析钙铝石和钙矾石是可能的。劣化混凝土的样品(不包括粗骨料)含有20%-75%的索马石。(C)2003爱思唯尔有限公司。保留所有权利。
In Germany, after testing two concretes deteriorated due to the formation of thaumasite, possibilities and problems in analysing thaumasite and ettringite-containing concrete samples will be discussed. The image of polished thin sections show, that thaumasite formation leads to microstructures similar to the microstructure of ettringite. It is recognisable in the microstructure that the formation of thaumasite happens as well via deterioration of CSH-phases as via the decomposition of ettringite. The identification of thaumasite using environmental scanning electron microscopy is possible without problems. Investigations using X-ray powder diffraction did show, that quantitative analysis of thaumasite and ettringite is possible by using the Rietveld method. The samples of deteriorated concrete (excluding coarse aggregate) contain 20-75% thaumasite. (C) 2003 Elsevier Ltd. All rights reserved.