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首页> 外文学位 >Cesium and strontium partitioning during hydration of calcium aluminosilicates.
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Cesium and strontium partitioning during hydration of calcium aluminosilicates.

机译：铝硅酸钙水合过程中的铯和锶分配。

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摘要

By extracting and analyzing the pore solutions of a series of blended cement pastes as a function of time it was determined that cesium and strontium were being incorporated by various hydrated solid phases and that the incorporation was in some cases still in progress after 28 days of curing. Comparison of the pore solution and leachate data indicated that a direct relationship between the two does exist and that the pore expression technique may prove valuable in predicting possible leaching behavior of cement-based waste forms.;Although the analysis of the pore solution did provide important partitioning data, it did not provide information concerning which phase or phases were incorporating cesium. Therefore, experiments were performed in which a series of calcium aluminosilicate glasses were hydrated with CsOH solution, CsCl solution and deionized water at 38 and 90;The correlation between pore solution and leachate data led to the development of a conceptual model in which the early leachate concentration can be described in terms of the mixing of the open pore solutions with the leachant and dissolution of the blended cement paste. This early stage is followed by continued dissolution and competing reactions such as precipitation. Eventually a steady state or equilibrium is reached in which the leachate concentrations of cesium and strontium approach that in the original pore solution. The model assumes that sufficient quantities of cesium or strontium are available in the blended cement paste to reach the steady state value in the leachate and that the leachant is not renewed or added to with time.
机译：通过提取和分析一系列随时间变化的水泥浆的孔溶液，可以确定铯和锶已通过各种水合固相掺入，并且在固化28天后仍在进行掺入。孔隙溶液和渗滤液数据的比较表明，两者之间确实存在直接关系，并且孔隙表达技术可能在预测水泥基废物形态的可能浸出行为方面具有重要价值。尽管对孔隙溶液的分析确实提供了重要的信息在对数据进行分区时，它没有提供有关哪个或多个阶段掺入铯的信息。因此，进行了一系列实验，分别在38和90℃下用CsOH溶液，CsCl溶液和去离子水对一系列铝硅酸钙玻璃进行了水合;孔溶液与渗滤液数据之间的相关性导致了概念模型的发展，其中早期渗滤液浓度可以用开孔溶液与浸出剂的混合以及混合水泥浆的溶解来描述。在这个早期阶段之后是持续溶解和竞争反应，例如沉淀。最终达到稳态或平衡，其中铯和锶的浸出液浓度接近原始孔溶液中的浓度。该模型假定掺合水泥浆中有足够量的铯或锶可达到渗滤液中的稳态值，并且渗滤液不会随时间而更新或添加。

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  • 作者

    Hoyle, Susan Q.;

  • 作者单位

    The Pennsylvania State University.;

  • 授予单位 The Pennsylvania State University.;
  • 学科 Engineering Materials Science.
  • 学位 Ph.D.
  • 年度 1988
  • 页码 214 p.
  • 总页数 214
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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