<i>In situ</i>synchrotron powder diffraction study of active belite clinkers

Torre, Ángeles G. De la; Morsli, Khadija; Zahir, Md. Hasan; Aranda, Miguel A. G.

doi:10.1107/s0021889807042379

Cited by 29 publications

(55 citation statements)

References 26 publications

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“…Using a halogen furnace that can heat up to 1600°C, the clinkering reactions of active belite clinkers were reported using platinum tubes. [82] The selected wavelength was very short, λ = 0.30Å, to go through the highly absorbing Pt capillary. Rietveld methodology was successfully applied to the recorded data to obtain quantitative phase analyses.…”

Section: In-situ Clinkering Studies At Very High Temperaturesmentioning

confidence: 99%

“…First, the precalcined raw material mixtures(s) are loaded into Platinum tubes. [82] A precalcining step is needed to release the CO 2 and avoid overpressures in this type of experiments, where the sample is sealed within the capillary. Furthermore, expensive Pt capillaries/tubes are needed because the heated mixtures contain a relatively large fraction of highly reacting liquid (above 1200-1400°C), and so inexpensive ceramic tubes/capillaries cannot be used.…”

Section: In-situ Clinkering Studies At Very High Temperaturesmentioning

confidence: 99%

“…Under these very tough conditions (high temperatures with samples containing about 30 wt% of a highly reactive ceramic melt), the SXRPD patterns were of sufficient quality to allow appropriate quantification of the phase evolution. [82,83] …”

Section: In-situ Clinkering Studies At Very High Temperaturesmentioning

confidence: 99%

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Recent studies of cements and concretes by synchrotron radiation crystallographic and cognate methods

Aranda

2015

Crystallography Reviews

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The portfolio of available synchrotron radiation techniques is increasing notably for cements and pastes. Furthermore, sometimes the terminology is confusing and an overall picture highlighting similarities and differences of related techniques was lacking. Therefore, the main objective of this work is to review recent advances in synchrotron techniques providing a comprehensive overview. This work is not intended to gather all publications in cement chemistry but to give a unified picture through selected examples. Crystallographic techniques are used for structure determination, quantitative phase analyses and microstructure characterization. These studies are not only carried out in standard conditions but synchrotron techniques are especially suited to non-ambient conditions: high temperatures and pressures, hydration, etc., and combinations. Related crystallographic techniques, like Pair Distribution Function, are being used for the analysis of ill-crystalline phase(s). Furthermore, crystallographic tools are also employed in imaging techniques including scanning diffraction microscopy and tomography and coherent diffraction imaging. Other synchrotron techniques are also reviewed including X-rays absorption spectroscopy for local structure and speciation characterizations; small angle X-ray scattering for microstructure analysis and several imaging techniques for microstructure quantification: full-field soft and hard X-ray nano-tomographies; scanning infrared spectro-microscopy; scanning transmission and fluorescence X-ray tomographies. Finally, a personal outlook is provided.

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Section: In-situ Clinkering Studies At Very High Temperaturesmentioning

confidence: 99%

Section: In-situ Clinkering Studies At Very High Temperaturesmentioning

confidence: 99%

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Recent studies of cements and concretes by synchrotron radiation crystallographic and cognate methods

Aranda

2015

Crystallography Reviews

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“…Aunque el K 2 O y Na 2 O rebajan la temperatura de formación de la fase líquida, en ausencia de SO 3 aumentan su viscosidad (26). Hay que indicar que la viscosidad tiene una gran influencia sobre la velocidad de difusión atómica necesaria para formar el C 3 S, que es la última fase formada en el proceso de clinkerización (27 foreign ions. The addition of alkalis to the raw mixes favoured α' H -C 2 S stabilization in all the clinkers.…”

Section: Mineralogical Analysisunclassified

“…Although K 2 O and Na 2 O lowered the temperature at which the liquid phase formed, in the absence of SO 3 they raised its viscosity (26). Viscosity, in turn, affects the rate of atomic diffusion needed to form C 3 S, the last phase to appear in clinkerization (27).…”

Section: Mineralogical Analysismentioning

confidence: 99%

Preparación y caracterización de cementos belíticos blancos activados con dopantes alcalinos

Morsli¹,

Torre²,

Cuberos³

et al. 2009

Mater. construcc.

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RESUMENSe han preparado clínkeres blancos activados con un porcentaje en peso teórico de belita (silicato dicálcico) del 60%, a una temperatura 100 ºC menor que los clín-keres Portland blancos convencionales. El proceso de activación se ha llevado a cabo añadiendo a las mezclas crudas cantidades variables de K 2 CO 3 o Na 2 CO 3 . Utilizando la difracción de rayos-X y la metodología de Rietveld se ha comprobado la estabilización a temperatura ambiente de porcentajes variables de los polimorfos de alta temperatura de la belita por la adición de alcalinos. De hecho, al añadir 2,0% en peso de Na 2 O se ha obtenido 16,4(4)% de α-C 2 S, 16,7(8)% de α' H -C 2 S, 23,2(6)% de β-C 2 S, 32,7(7)% de C 3 S total, 9,5(2)% de C 3 A ortorrómbico y 1,50(5)% de cal libre, porcentajes en peso. Se ha comprobado que el grado de volatilización de los alcalinos, en estas condiciones de preparación, ha sido muy acusado para el K 2 O, lo que ha provocado una menor estabilización de los polimorfos tipo-α-C 2 S. Además, se ha realizado un estudio calorimétrico para correlacionar el ensamblaje de fases con el comportamiento de hidratación a edades tempranas.Palabras clave: cementos belíticos blancos activados, difracción de rayos-X, método de Rietveld, calorimetría isoterma de conducción. SUMMARYActivated white cement clinkers with a theoretical 60% (wt) belite (dicalcium silicate) content were prepared at a temperature 100 ºC lower than used to manufacture conventional white Portland cement clinkers. Activation was achieved by adding variable amounts of K 2 CO 3 or Na 2 CO 3 to the raw mixes. Rietveld quantitative analysis of X-ray diffraction findings showed that adding the alkalis stabilized the high temperature belite polymorphs. When 2.0% (wt) of Na 2 O was added, the composition (by wt) found was 16.4(4)% α-C 2 S, 16.7(8)% α' H -C 2 S, 23.2(6)% β-C 2 S, 32.7(7)% total C 3 S, 9.5(2)% orthorhombic C 3 A and 1.50(5)% free lime. Due to the high volatilization rate of K 2 O under the experimental conditions, it stabilized the alpha-type C 2 S less effectively than Na 2 O. A calorimetric study was likewise performed to correlate the phase composition with early age hydration (behaviour).K Ke e y y w w o or r d ds s : : activated white belite cements, X-ray diffraction, Rietveld method, isothermal conduction calorimetry.(

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Mineralogical and geochemical study of industrial clinker: material behavior in the burning zone

et al. 2022

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In situsynchrotron powder diffraction study of active belite clinkers

Cited by 29 publications

References 26 publications

Recent studies of cements and concretes by synchrotron radiation crystallographic and cognate methods

Recent studies of cements and concretes by synchrotron radiation crystallographic and cognate methods

Preparación y caracterización de cementos belíticos blancos activados con dopantes alcalinos

Mineralogical and geochemical study of industrial clinker: material behavior in the burning zone

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