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Study of carbonatation in alkali activated systems
Suchý, Rostislav ; Koplík, Jan (referee) ; Kalina, Lukáš (advisor)
The carbonation of the building materials based on the ordinary Portland cement is relatively well-known and extensively studied phenomenon. Conversely mechanism, reaction products and factors affecting the carbonation of the alkali activated materials are still not sufficiently clarified. In this work, the progression of the carbonation of the alkali activated materials under different conditions was investigated. The reaction products and the microstructural changes were determined by XRD respectively SEM-EDX analysis. The corrosive conditions due to the decreasing of the pH of the binders by the carbonation were observed by XPS analysis of the steel fibers. The carbonation of the alkali activated samples was compared with the reference samples based on the Portland composite cement. Besides these analyzes, the mechanical properties of the binders were monitored.
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Reduction of efflorescence in the geopolymer systems
Suchý, Rostislav ; Šoukal, František (referee) ; Kalina, Lukáš (advisor)
Alkali metal cations are weakly bound in the structure of alkali activated materials. This fact causes the formation of undesirable efflorescence in humid environment. In this work, the effect of fluoride additives, which significantly reduce the efflorescence, was investigated. The chemical mechanism of selected additive in the modified binder was studied based on XRD, SEM EDX and ICP OES analysis. Also the effect of the added fluorides on the mechanical properties of the final product was monitored.
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Study of carbonatation in alkali activated systems
Suchý, Rostislav ; Koplík, Jan (referee) ; Kalina, Lukáš (advisor)
The carbonation of the building materials based on the ordinary Portland cement is relatively well-known and extensively studied phenomenon. Conversely mechanism, reaction products and factors affecting the carbonation of the alkali activated materials are still not sufficiently clarified. In this work, the progression of the carbonation of the alkali activated materials under different conditions was investigated. The reaction products and the microstructural changes were determined by XRD respectively SEM-EDX analysis. The corrosive conditions due to the decreasing of the pH of the binders by the carbonation were observed by XPS analysis of the steel fibers. The carbonation of the alkali activated samples was compared with the reference samples based on the Portland composite cement. Besides these analyzes, the mechanical properties of the binders were monitored.
|
|
|
Reduction of efflorescence in the geopolymer systems
Suchý, Rostislav ; Šoukal, František (referee) ; Kalina, Lukáš (advisor)
Alkali metal cations are weakly bound in the structure of alkali activated materials. This fact causes the formation of undesirable efflorescence in humid environment. In this work, the effect of fluoride additives, which significantly reduce the efflorescence, was investigated. The chemical mechanism of selected additive in the modified binder was studied based on XRD, SEM EDX and ICP OES analysis. Also the effect of the added fluorides on the mechanical properties of the final product was monitored.
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