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Screening coal combustion fly ashes for application in geopolymers

机译：筛选用于地聚合物中的燃煤飞灰

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摘要

Driven by cost and sustainability, secondary resource materials such as fly ash, blast furnace slag, and bottom ash are increasingly used for alternative types of concrete binders, such as geopolymers. Because secondary resources may be highly variable from the perspective of geopolymers, it is often a challenge to upscale these binder types to an industrial scale. This paper describes the testing of a screening method -feature sizing and chemical typing (FS&CT) using an electron microscope - in order to capture the heterogeneity of secondary resources in a quantitative manner. This automated technique is able to simultaneously measure inter particle variations in chemistry (energy dispersive X-ray spectra) and size (shape). Two key variables for application in geopolymers, Si:Al ratio and size, are measured using FS&CT for coal combustion fly ash and its fraction of potentially reactive aluminium-silicate particles. These measurements have been preliminary related to the reactivity of the fly ash in NaOH-solutions with high liquid/solid ratios as well as low liquid/solid ratios (geopolymers). As such the FS&CT method is found to be a useful alternative to commonly used bulk methods such as X-ray fluorescence (XRF) or manually operated electron microscopy that gives just an indication of local heterogeneity.
机译：在成本和可持续性的驱动下，诸如粉煤灰，高炉矿渣和底灰之类的二次资源材料越来越多地用于替代类型的混凝土粘合剂，例如地质聚合物。因为从地聚合物的角度来看，辅助资源可能变化很大，所以将这些粘合剂类型提升到工业规模通常是一个挑战。本文介绍了一种筛选方法的测试-使用电子显微镜进行特征上浆和化学分型（FS＆CT）-以定量方式捕获二次资源的异质性。这种自动化技术能够同时测量化学（能量色散X射线光谱）和尺寸（形状）之间的粒子间变化。使用FS＆CT测量了煤燃烧飞灰及其潜在反应性铝硅酸盐颗粒的含量，测量了应用于地质聚合物的两个关键变量，Si：Al的比例和尺寸。这些测量已经初步与粉煤灰在具有高液/固比和低液/固比（地聚合物）的NaOH溶液中的反应性相关。因此，发现FS＆CT方法是常用的批量方法（例如仅显示局部异质性的X射线荧光（XRF）或手动操作的电子显微镜）的有用替代方法。

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  • 来源
    《Fuel》 |2013年第4期|490-497|共8页
  • 作者

    Siska LA Valcke; Angelo J. Saraber; Penny Pipilikaki; Hartmut R. Fischer; Henk W. Nugteren;

  • 作者单位

    TNO, Van Mourik Broekmanweg 6, 2628 XE Delft, The Netherlands;

    Vliegasunie BV, Belle van Zuylenlaan 3, 4105 JX Culemborg, The Netherlands;

    TNO, Van Mourik Broekmanweg 6, 2628 XE Delft, The Netherlands;

    TNO, Van Mourik Broekmanweg 6, 2628 XE Delft, The Netherlands;

    Delft University of Technology, Department of Chemical Engineering, Product and Process Engineering Group, Julianalaan 136, 2628 BL Delft, The Netherlands;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    fly ash; reactivity; binder; geopolymer; feature sizing and chemical typing;

    机译：粉煤灰反应性粘合剂地质聚合物特征尺寸和化学分型;

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