• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文学位 >Characterization of crystalline and amorphous phases and respective reactivities in a Class F fly ash.
【24h】

Characterization of crystalline and amorphous phases and respective reactivities in a Class F fly ash.

机译：F类粉煤灰中结晶相和非晶相的表征以及相应的反应性。

获取原文
获取原文并翻译 | 示例
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

A comprehensive approach to qualitative and quantitative characterization of crystalline and amorphous constituent phases of a largely heterogeneous Class F fly ash is presented. Traditionally, fly ash composition is expressed as bulk elemental oxide contents as determined by x-ray fluorescence spectroscopy. However, such analysis does not discern between relatively inert crystalline phases and highly reactive amorphous phases of similar elemental composition. Analytical techniques commonly used in the fields of chemistry and materials science have been modified and applied to effectively characterize the discrete crystalline and amorphous phases in a Class F fly ash.;X-ray diffraction has been used to identify the crystalline phases present in the fly ash, and the Rietveld quantitative phase analysis method has been applied to determine the relative proportion of each of these phases. A synergistic method of scanning electron microscopy, energy dispersive spectroscopy, and multispectral image analysis has been developed to identify and quantify the amorphous phases present in the fly ash. High-resolution spatial element maps are generated through intensive energy dispersive spectroscopy. The maps are statistically combined, phase boundaries are delineated, and relative phase fractions are determined through multispectral image analysis.;Controlled leaching experiments have been performed to quantify the reactivity of the constituent phases in alkaline environments. Fly ash samples were subjected to various alkaline solutions for periods ranging from 1 day to 365 days. The fly ash was physically separated from the solution, the crystalline phase fractions were determined through Rietveld quantitative x-ray diffraction, and the amorphous phase fractions were determined through multispectral image analysis. The phase distributions of the leached fly ash were compared to those of the raw, unleached ash. The composition of the leachate solution was also analyzed using inductively coupled plasma - optical emission spectroscopy.;The application of x-ray diffraction, Rietveld quantitative phase analysis, scanning electron microscopy, energy dispersive spectroscopy, multispectral image analysis, and inductively coupled plasma---optical emission spectroscopy techniques to the characterization of fly ash has facilitated a more comprehensive understanding of the widely-used engineering material.
机译：提出了一种定性和定量表征大部分为非均质F类粉煤灰的结晶和无定形组成相的综合方法。传统上，粉煤灰成分表示为通过X射线荧光光谱法测定的本体元素氧化物含量。但是，这种分析不能区分出相对惰性的结晶相和具有相似元素组成的高反应性非晶相。化学和材料科学领域中常用的分析技术已被修改并应用于有效地表征F级粉煤灰中的离散结晶相和非晶相。; X射线衍射已被用于鉴定粉煤灰中存在的结晶相灰，Rietveld定量相分析方法已用于确定这些相中每个相的相对比例。已经开发出一种协同方法，用于扫描电子显微镜，能量色散光谱和多光谱图像分析，以鉴定和量化飞灰中存在的非晶相。高分辨率空间元素图是通过密集的能量色散光谱法生成的。这些图经过统计组合，描绘了相界，并通过多光谱图像分析确定了相对相分数。粉煤灰样品经过各种碱性溶液处理，时间范围为1天至365天。将粉煤灰与溶液物理分离，通过Rietveld定量X射线衍射确定结晶相分数，并通过多光谱图像分析确定非晶相分数。将沥滤的粉煤灰的相分布与未沥滤的原始粉煤的相分布进行了比较。还使用电感耦合等离子体-发射光谱法分析了渗滤液溶液的组成; x射线衍射，Rietveld定量相分析，扫描电子显微镜，能量色散光谱，多光谱图像分析和电感耦合等离子体的应用-用光学发射光谱技术表征粉煤灰有助于更广泛地了解广泛使用的工程材料。

著录项

  • 作者

    Chancey, Ryan Thomas.;

  • 作者单位

    The University of Texas at Austin.;

  • 授予单位 The University of Texas at Austin.;
  • 学科 Engineering Civil.
  • 学位 Ph.D.
  • 年度 2008
  • 页码 252 p.
  • 总页数 252
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 建筑科学;
  • 关键词

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号