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首页> 外文期刊>Powder diffraction >Advanced Rietveld refinement and SEM analysis of tobermorite in chemically diverse autoclaved aerated concrete
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Advanced Rietveld refinement and SEM analysis of tobermorite in chemically diverse autoclaved aerated concrete

机译：化学多样化的高压加气混凝土中硅铁矿的高级Rietveld精炼和SEM分析

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摘要

Changes of structural properties of tobermorite in autoclaved aerated concrete (AAC) for various compositions were characterized and the disadvantages of SEM analysis in this context are discussed. The influence of variations in the chemical composition of raw materials on lattice parameters, morphology and domain sizes of tobermorite was investigated by XRD and for comparison by SEM analysis. Particularly the effect of substitution by Al3+ and (SO4)2- in tobermorite structure was examined. The dimensions of coherently scattering domains were calculated based on the refinement of anisotropic peak broadening of tobermorite in XRD diffractograms using a Rietveld compatible approach. No effect of (SO4)2- on the domain sizes and lattice parameters of tobermorite could be observed. The amount of anhydrite detected by quantitative XRD analysis indicates that all of the available (SO4)2- is present as anhydrite. Lath-like shapes of domains and a larger c parameter are calculated whenever Al3+ is incorporated in a considerable amount. Formation of katoite can be observed very clearly in SEM micrographs whenever the amount of available Al3+ exceeds a distinct value in the dry mix. The effect of Al3+ and (SO4)2- on tobermorite morphology could not be observed clearly by SEM analysis in AAC samples.
机译：表征了蒸压加气混凝土（AAC）中硅铁矿结构特性的变化，并讨论了这种情况下SEM分析的缺点。用XRD研究了原料化学组成的变化对硅铁矿晶格参数，形态和畴尺寸的影响，并通过SEM进行了比较。特别是研究了在苏铁矿结构中被Al3 +和（SO4）2-取代的影响。相干散射域的尺寸是基于Rietveld兼容方法，基于XRD衍射图中顽辉石各向异性峰展宽的细化而计算的。没有观察到（SO 4）2-对苏铁矿的畴尺寸和晶格参数的影响。通过定量XRD分析检测到的硬石膏的量表明，所有可用的（SO4）2-均以硬石膏的形式存在。每当掺入大量的Al3 +时，就会计算出类似板条的畴形状和较大的c参数。只要干燥混合物中可用的Al3 +含量超过明显值，就可以在SEM显微照片中非常清楚地观察到滑石的形成。通过AAC样品的SEM分析无法清楚地观察到Al3 +和（SO4）2-对硅铁矿形态的影响。

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  • 来源
    《Powder diffraction》 |2019年第2期|143-150|共8页
  • 作者

    Schreiner J.; Goetz-Neunhoeffer F.; Neubauer J.; Volkmann S.; Bergold S.; Webler R.; Jansen D.;

  • 作者单位

    Univ Erlangen Nurnberg, GeoZentrum Nordbayern, Mineral, Schlossgarten 5a, D-91054 Erlangen, Germany;

    Univ Erlangen Nurnberg, GeoZentrum Nordbayern, Mineral, Schlossgarten 5a, D-91054 Erlangen, Germany;

    Univ Erlangen Nurnberg, GeoZentrum Nordbayern, Mineral, Schlossgarten 5a, D-91054 Erlangen, Germany;

    Rodgauer Baustoffwerke GmbH & Co KG, Opel Pruffeld 3, D-63110 Rodgau Dudenhofen, Germany;

    Schlenk Metall Pigments GmbH, Barnsdorfer Hauptstr 5, D-91154 Roth, Germany;

    Schlenk Metall Pigments GmbH, Barnsdorfer Hauptstr 5, D-91154 Roth, Germany;

    Univ Erlangen Nurnberg, GeoZentrum Nordbayern, Mineral, Schlossgarten 5a, D-91054 Erlangen, Germany;

  • 收录信息 美国《科学引文索引》(SCI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    tobermorite; autoclaved aerated concrete; Rietveld refinement; domain sizes; SEM analysis;

    机译：雪铁矿;高压灭菌加气混凝土;Rietveld细化;区域尺寸;SEM分析;

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