无水 CSA 水泥的相定量:X 射线衍射和拉曼成像相结合的方法

IF 16.4 1区 化学 Q1 CHEMISTRY, MULTIDISCIPLINARY
Chirayu Kothari, Nishant Garg
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引用次数: 0

摘要

硫铝酸钙(CSA)水泥以其特殊性能而闻名,如收缩补偿和高早期强度。这些特性取决于水化相的组合,而水化相的组合又受初始无水水泥中存在的相的制约。然而,由于存在重叠峰、多晶体和优选取向,通过 XRD Rietveld 对无水 CSA 相进行定量具有挑战性。为了克服这一问题,我们引入了一种方法,包括高分辨率大面积拉曼成像(5 毫米 x 5 毫米,25 万像素,分辨率为 10 微米/像素),并辅以 XRD 分析。研究发现,这种结合 XRD 和拉曼成像的综合方法对于初步确定 CSA 系统中存在的相至关重要。最重要的是,定量分析显示这两种独立方法之间具有很强的相关性(R2 > 0.99)和一致性(变化 < 5 wt.%),为这种双技术方法获得的相组合增加了信心和可靠性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Phase quantification of anhydrous CSA cements: a combined X-ray diffraction and Raman imaging approach
Calcium Sulfoaluminate (CSA) cements are known for their special properties, such as shrinkage compensation and high early-age strength. These properties are dependent on the hydrated phase assemblage, which in turn is governed by the phases present in the initial anhydrous cement. However, the anhydrous CSA phase quantification via XRD Rietveld can be challenging due to the presence of overlapping peaks, polymorphs, and preferred orientation. To overcome this problem, an approach involving high-resolution large-area Raman imaging (5mm x 5mm, 250,000 pixels, with 10 μm/pixel resolution) complemented by XRD analysis is introduced. This integrated approach of combined XRD and Raman Imaging is found to be crucial in the initial identification of phases that are present in a CSA system. Most importantly, quantitative analysis shows a strong correlation (R2 > 0.99) and agreement (variation < 5 wt.%) between the two independent methods, adding confidence and reliability to the phase assemblage obtained by this dual technique approach.
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来源期刊
Accounts of Chemical Research
Accounts of Chemical Research 化学-化学综合
CiteScore
31.40
自引率
1.10%
发文量
312
审稿时长
2 months
期刊介绍: Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.
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