|
|
Preparation of calcium-aluminate phases
Ohaňka, Zdeněk ; Novotný, Radoslav (referee) ; Koplík, Jan (advisor)
This work focuses on the preparation of calcium aluminates by solid state synthesis and by sol-gel method. Phases prepared were monocalcium aluminate (CA), dodecacalcium heptaaluminate (C12A7), tricalcium aluminate (C3A) and calcium dialuminate (CA2). Two modifications of sol-gel method were used – the difference between them was in the addition of EDTA. Each method was closely described and results were compared according to the achieved purity of prepared phases. X-ray diffraction analysis was used to determine the purity of prepared calcium-aluminates.
|
|
|
The influence of particle size and methods of preparation of calcium aluminate phases on their hydration
Ohaňka, Zdeněk ; Másilko, Jiří (referee) ; Koplík, Jan (advisor)
This work focuses on the hydration of four calcium aluminate phases – C3A, C12A7, CA and CA2. Above all, the influence of particle size and method of preparation on hydration behaviour were studied. Influence of these factors on hydration products were also investigated. Calcium aluminates were prepared by solid state synthesis and amorphous citrate method. Both methods were described in detail. The particle size was determined by laser diffraction. Isothermic calorimetry was used to investigate the process of hydration. Hydration products were identified by X-ray diffraction analysis and simultaneous thermogravimetric and differential thermal analysis.
|
|
|
Praparation and characterization of calcium aluminate hydrates
Hubáček, Václav ; Švec, Jiří (referee) ; Koplík, Jan (advisor)
This thesis deals with the preparation of pure calcium aluminate phases, specifically CA, CA2, C3A and C12A7 by two different methods - the solid state synthesis and the amorphous citrate method. The hydration of these phases at different temperatures was also studied The effect of the phase preparation method used and the simultaneous effect of temperature were observed on the prepared hydrates, using suitable analytical methods. The characterization and identification of the prepared phases and their hydrates were studied by X-ray diffraction analysis, Fourier transform infrared spectroscopy, scanning electron microscopy and simultaneous thermogravimetric and differential thermal analysis. The prepared hydration products were mostly identified in accordance with the literature data. TGA/DTA of the prepared hydrates helped to clarify some of the hydrate decomposition processes, especially for the hexagonal hydrate CAH10 and the cubic hydrate C3AH6, which were prepared in a sufficiently pure form suitable for analysis.
|
|
|
The influence of particle size and methods of preparation of calcium aluminate phases on their hydration
Ohaňka, Zdeněk ; Másilko, Jiří (referee) ; Koplík, Jan (advisor)
This work focuses on the hydration of four calcium aluminate phases – C3A, C12A7, CA and CA2. Above all, the influence of particle size and method of preparation on hydration behaviour were studied. Influence of these factors on hydration products were also investigated. Calcium aluminates were prepared by solid state synthesis and amorphous citrate method. Both methods were described in detail. The particle size was determined by laser diffraction. Isothermic calorimetry was used to investigate the process of hydration. Hydration products were identified by X-ray diffraction analysis and simultaneous thermogravimetric and differential thermal analysis.
|
|
|
Preparation of calcium-aluminate phases
Ohaňka, Zdeněk ; Novotný, Radoslav (referee) ; Koplík, Jan (advisor)
This work focuses on the preparation of calcium aluminates by solid state synthesis and by sol-gel method. Phases prepared were monocalcium aluminate (CA), dodecacalcium heptaaluminate (C12A7), tricalcium aluminate (C3A) and calcium dialuminate (CA2). Two modifications of sol-gel method were used – the difference between them was in the addition of EDTA. Each method was closely described and results were compared according to the achieved purity of prepared phases. X-ray diffraction analysis was used to determine the purity of prepared calcium-aluminates.
|
guest ::
