Qualitative and quantitative chemical-mineralogical characterisation of Portlandcement clinkers by means of scanning electron microscopy techniques

利用扫描电子显微镜技术对波特兰水泥熟料进行定性和定量化学矿物学表征

• 批准号: 265735853
• 负责人: Professor Dr.-Ing. Horst-Michael Ludwig
• 金额: --
• 依托单位: F. A. Finger-Institut für Baustoffkunde
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2014
• 资助国家: 德国
• 起止时间: 2013-12-31 至 2020-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/265735853?language=en
• 关键词: Qualitative; quantitative; chemical; mineralogical; characterisation

In the previous project, the EBSD method for the characterization of cement clinkers was established. As described in the project report, the coupled EBSD-EDX analysis offers for the first time the possibility to characterize cement clinker in a spatial-resolved chemical-crystallographic manner. This means that for all clinker phases their fraction, chemical composition (including minor and trace element), crystallinity and crystallite sizes can be determined. For the first time crystallite sizes of the fine-grained clinker phases are accessible (1-10 μm).In the continuation of the project, the EBSD-EDX technology, previously successfully established in the cement sector, will be further developed to enable high-resolution, statistically safe analyzes of all clinker phases. A new, high-resolution EBSD camera is to be used for this purpose.Belit: In the previous project, it was found that the EBSD patterns of belite indicate low crystallinity, and that even when they are observed in idiomorphic crystal shape only very small crystalline areas can be detected. With the help of a more sensitive, high-resolution EBSD camera, the fine structure of the belite in Portland cement clinkers is to be analyzed in the follow-up project. In addition, alternative, climate-friendly clinkers are also to be characterized, in which a variability of the belite crystallinity is suspected. These are clinkers based on belite calcium-sulfo-aluminate-ternesite (BCT) and belite ye'elemit ferrite (BYF), which have not yet been characterized by EBSD-EDX.Alit: In the first part of the project, coupled EBSD-EDX analysis has already been successfully used to characterize the chemical-crystallographic composition (phase fraction, chemical composition, and crystal size) of various alite modifications. With the new EBSD camera, the influence of foreign ions on the fine structure and performance of alites is to be investigated systematically.Calcium aluminate (C3A) and - ferrite phases (C4AF): For these phases fundamental chemical-crystallographic analyzes have hitherto only been possible to a limited extent. In particular, the influence of the variation of the crystallite sizes and the chemical composition on the reactivity of the phases is still controversially discussed. In the proposed project, the high-resolution chemico-crystallographic characterization of C3A and C4AF phases contained will be optimized. Especially the structural changes of C3A and C4AF phases induced by variation in iron, magnesium and alkali content of cement clinker will be studied. All characterizations are to be accompanied by hydration studies in order to allow the correlation of the data obtained with the reactivity of the materials.As a result of the project, the coupled EBSD-EDX clinker analysis will be practical applicable and basic relations between clinker phase composition, crystallinity and reactivity will be revealed.

在上一个项目中，建立了用于表征水泥熟料的EBSD方法。如项目报告中所述，耦合的EBSD-EDX分析首次提供了以空间分辨化学结晶方式表征水泥熟料的可能性。这意味着可以确定所有熟料的分数，化学成分（包括次要元素和痕量元素），结晶度和结晶石大小。首次可以访问细粒熟料阶段的结晶石尺寸（1-10μm）。在项目的持续下去，将进一步开发以前在水泥领域成功建立的EBSD-EDX技术，以启用所有熟料阶段的高分辨率，统计上安全的分析。贝尔特：在上一个项目中，要使用新的高分辨率EBSD摄像头。发现贝利特的EBSD模式表明低结晶度，即使在特分形晶体形状中观察到它们，也只能检测到很小的晶体区域。借助更敏感，高分辨率的EBSD摄像头，在后续项目中应分析波特兰水泥熟料中贝特的精细结构。此外，还将表征替代性攀爬友好的熟料，其中怀疑是贝利特结晶度的变异性。这些是基于Belite钙 - 硫氧化甲酸盐（BCT）和Belite Ye'Elemite铁矿（BYF）的熟料，尚未以EBSD-EDX.Alit的特征来表征：在项目的第一部分中，EBSD-EDX分析已经成功地表征了化学生构图（化学层构型），并具有化学成分的构图（阶段）。修改。借助新的EBSD摄像头，应系统地研究外国离子对铝利的良好结构和性能的影响。铝（C3A）和 - 铁素体相（C4AF）：对于这些阶段，仅在有限的范围内隐藏了基本化学 - 晶体学分析。特别是，仍在讨论晶体大小和化学组成对相反应性的变化的影响。在拟议的项目中，将优化包含的C3A和C4AF阶段的高分辨率化学化学特征表征。特别是研究水泥熟料的铁，镁和碱含量的变化引起的C3A和C4AF阶段的结构变化。所有特征均应通过水合研究来完成，以允许获得与材料的反应性获得的数据相关。作为项目的结果，将揭示耦合的EBSD-EDX熟料分析是实用的，并且将揭示熟料阶段组成，结晶度和反应性之间的基本关系。