Application of various microscopy techniques to study early-age and longer-term behaviour of super sulphated cement microstructure

IF 16.4 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Accounts of Chemical Research Pub Date : 2024-03-02 DOI:10.1111/jmi.13281

Migueli Chedrewih, Marta Medala, Christelle Schmid, Emmanuel Garcia, Denis Damidot, Vincent Thiéry

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Abstract

Super sulphated cement (SSC) is a very promising substitute for traditional construction materials (i.e. Portland cement), due to its enhanced durability and particularly low environmental impact. This paper explores the microstructure and certain properties of SSC, focusing on the particular complexities of its microstructure and the difficulties of microanalysis of its hydrates. To do so, SSC paste samples were first cast to identify hydration products using X-ray diffraction, then observed at early age using confocal laser scanning microscopy (CLSM) and at early and late age using scanning electron microscopy. In addition, concrete cores impregnated with fluorescein in order to highlight porosity, cracking and aggregates debonding were observed under UV light using optical microscopy (OM), showing a complete absence of cracking and aggregate debonding. Both microscopy techniques (CLSM and UV light OM) have been applied to this type of binder for the first time. The results show that SSC microstructure is characterised by a sophisticated intergrowth of various phases, including ettringite and amorphous calcium-(alumina)-silicate hydrate gels. Finally, Monte–Carlo simulation of electron-matter has been provided for a better understanding of EDS analysis.

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应用各种显微镜技术研究超硫酸盐水泥微观结构的早期龄期和长期行为。

超硫酸盐水泥（SSC）是一种非常有前途的传统建筑材料（即硅酸盐水泥）的替代品，因为它具有更高的耐久性和特别低的环境影响。本文探讨了超硫酸盐水泥的微观结构和某些特性，重点是其微观结构的特殊复杂性以及对其水合物进行微观分析的困难。为此，首先浇注了 SSC 浆料样品，使用 X 射线衍射法确定水化产物，然后使用共焦激光扫描显微镜（CLSM）观察早期龄期，并使用扫描电子显微镜观察早期和晚期龄期。此外，还使用光学显微镜（OM）在紫外光下观察浸有荧光素的混凝土芯，以突出孔隙率、开裂和集料脱落，结果显示完全没有开裂和集料脱落。这两种显微镜技术（CLSM 和紫外光 OM）都是首次应用于这种类型的粘结剂。结果表明，SSC 的微观结构特点是各种相的复杂交错生长，包括乙长石和无定形的水合硅酸钙（氧化铝）凝胶。最后，为了更好地理解 EDS 分析，还提供了电子-物质的蒙特卡洛模拟。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

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.