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Studying the behavior of concrete at high temperatures
Fiala, Jiří ; Sitek,, Libor (referee) ; Bodnárová, Lenka (advisor)
This thesis deals with the behavior of cement concrete at high temperature with a focus on the impact behavior of aggregate, cement type and polypropylene fiber reinforcement. The theoretical part describes the issue of cement concrete at high temperatures, especially processes in the cement matrix, aggregates and polypropylene fibers. Furthermore, theoretical part describes the selection of a suitable type of cement and aggregates in concrete exposed to high temperatures. In the experimental part was designed the concrete composition with various kinds different types of aggregates and two types of cements. The temperature stress of test samples was performed according to ISO standard temperature curve 834. Subsequently, was made the verification of the physic-mechanical properties such as changes in bulk density and compressive strength after heat load. Moreover, the surface appearance of samples after heat load was evaluated, especially the occurrence of samples, the crack width and explosive spalling. Mineralogical composition changes of prepared samples before and after heat load were observed via X-ray diffraction analysis. Finally, we made a photogrammetry on a test plates after heat load which defined the size of the area and depth of spalling concrete surface.
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