Chemical – crystallographic characterisation of cement clinkers by EBSD-EDS analysis in the SEM

Rößler, Christiane; Zimmer, Dominik; Trimby, Patrick; Ludwig, Horst‐Michael

doi:10.1016/j.cemconres.2022.106721

Cited by 25 publications

(6 citation statements)

References 23 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In general, a higher content of Ca 2 SiO 4 in total, α′-Ca 2 (SiO 4 ), and β-Ca 2 SiO 4 with high reactivity [ 28 ] fabricated at lower temperatures and with less holding time are preferred. In addition, obtaining final products with fewer residual raw materials is also a key principle to ensure the high purity of products when selecting optimal parameters.…”

Section: Resultsmentioning

confidence: 99%

Synthesis and Processing Parameter Optimization of Nano-Belite via One-Step Combustion Method

et al. 2022

View full text Add to dashboard Cite

This paper proposes a new chemical combustion method for the synthesis of nano-low-carbon belite cement via a simple one-step process without using any oxidizers, and related mechanisms are briefly introduced. The starting materials used, including micro-silica (silica fume) as a byproduct of the metallurgic industry and CaCO3 powders, are of great abundance, and the processing parameters involved were optimized using a series of systematic experiments based on X-ray diffraction (XRD) and the Rietveld fitting method. Besides, the properties of the synthesized belite cement were characterized by the Brunauer–Emmett–Teller (BET) technique and scanning electron microscopy (SEM). Experimental results revealed that the optimized fuel agent was urea with a dosage of 4.902 times that of the starting materials by mass, and the corresponding holding temperature and time were 1150 °C and 2 h, respectively. In addition, the CaO/(SiO2 + CaO) for the starting materials should be set at 62.5% by mass ratio. BET and SEM results showed that the obtained belite cement had a specific surface area of 11.17 m2/g and a size of around 500 nm or even smaller in spherical shapes, suggesting that this method was successfully implemented. Thus, it can be a promising approach for the synthesis of nano-belite particles as a low-carbon construction material, which could be used more in the near future, such as for low-carbon concrete productions.

show abstract

Section: Resultsmentioning

confidence: 99%

Synthesis and Processing Parameter Optimization of Nano-Belite via One-Step Combustion Method

et al. 2022

View full text Add to dashboard Cite

show abstract

“…76,41 It allows us to better interpret the individual contribution of each phase to the overall mechanical properties. Other imaging techniques such as optical microscopy, fluorescence, 77 EBSD 78 or Raman 79 can be combined to obtain complementary information.…”

Section: Correlation With Other Measurementsmentioning

confidence: 99%

A critical catalogue of SEM‐EDS multispectral maps analysis methods and their application to hydrated cementitious materials

Georget,

Schmatz,

Wellmann

et al. 2023

Journal of Microscopy

View full text Add to dashboard Cite

Many methods have been proposed to analyse SEM‐EDS hypermaps of hydrated cementitious materials but none can fit all purposes. In this presentation, we review existing methods for phase identification, stoichiometry quantification, and microstructure quantification in cementitious materials and related materials. We first discuss the unique contribution of SEM‐EDS with respect to the outstanding scientific challenges towards sustainable construction materials. We then compare the SEM‐EDS and image analysis techniques which contribute to answering these challenges. Convergence and divergence in current methods and workflows, and knowledge gaps are highlighted in terms of the specificities of the material (phase assemblage complexity, grain sizes, mixtures, etc.). The discussion is weighted by the required expert knowledge for the sample preparation, microscope operation, and data analysis. We conclude by discussing how microscopy and image analysis integrate into the overall experimental toolkit to investigate and improve cementitious materials.

show abstract

“…A deeper understanding of the mobility of individual ions and compounds is needed to support recent knowledge of mechanisms of C 4 AF hydration. 3,[16][17][18] In this study, the hydration of C 4 AF with silica fume and without gypsum was studied to simplify the system and clear the mobility of Fe and other constituent from C 4 AF using microscopic techniques. This is part of an ongoing study on the role of dopants.…”

Section: Introductionmentioning

confidence: 99%

“…The content and reactivity of C 4 AF changes significantly due to fluxes and mineralisers. A deeper understanding of the mobility of individual ions and compounds is needed to support recent knowledge of mechanisms of C 4 AF hydration 3,16–18 …”

Section: Introductionmentioning

confidence: 99%

Early hydration of C₄AF with silica fume and its role on katoite composition

Boháč,

Zezulová,

Krejčí Kotlánová

et al. 2024

Journal of Microscopy

View full text Add to dashboard Cite

C4AF is considered the least reactive main clinker phase, but its reactivity may be affected by adding supplementary cementitious materials (SCMs). Pure C4AF was synthesised in a laboratory furnace, and the role of silica fume without gypsum on its early hydration properties was monitored. Burning was carried out in four stages to achieve 99% purity of C4AF. Heat flow development was monitored by isothermal calorimetry over 7 days of hydration at 20°C and 40°C. The role of silica fume on hydrogarnet phase katoite (Ca3Al2(SiO4)3 – x(OH)4x x = 1.5–3) formation during early hydration was studied. Rapid dissolution of C4AF, formation of metastable C‐(A,F)‐H and its conversion to C3(A, F)H6 was evidenced by isothermal calorimetry as a large exotherm. Changes in microstructure during early hydration were documented by SE micrographs, EDS point analyses, X‐ray mapping and line scans by SEM‐EDS. The phase composition was characterised by DTA‐TGA and QXRD after 7 days of hydration. The katoite diffraction pattern is similar for the reference sample and sample with silica fume, but substitution in its structure can be revealed by X‐ray microanalyses. The composition of katoite is variable due to the various extent of substitution of 4OH− by SiO44− due to silica fume.

show abstract

Chemical – crystallographic characterisation of cement clinkers by EBSD-EDS analysis in the SEM

Cited by 25 publications

References 23 publications

Synthesis and Processing Parameter Optimization of Nano-Belite via One-Step Combustion Method

Synthesis and Processing Parameter Optimization of Nano-Belite via One-Step Combustion Method

A critical catalogue of SEM‐EDS multispectral maps analysis methods and their application to hydrated cementitious materials

Early hydration of C₄AF with silica fume and its role on katoite composition

Contact Info

Product

Resources

About

Chemical – crystallographic characterisation of cement clinkers by EBSD-EDS analysis in the SEM

Cited by 25 publications

References 23 publications

Synthesis and Processing Parameter Optimization of Nano-Belite via One-Step Combustion Method

Synthesis and Processing Parameter Optimization of Nano-Belite via One-Step Combustion Method

A critical catalogue of SEM‐EDS multispectral maps analysis methods and their application to hydrated cementitious materials

Early hydration of C4AF with silica fume and its role on katoite composition

Contact Info

Product

Resources

About

Early hydration of C₄AF with silica fume and its role on katoite composition