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Composite materials with silica matrix in the environment of high temperatures
Lisztwanová, Ewa ; Luňáček,, Martin (referee) ; Bydžovský, Jiří (advisor)
This thesis deals with the study and design of composite materials based on silica matrix suitable for extreme conditions, eg. for the repair of concrete structures with anticipated increased risk of fire. The theoretical part summarizes basic knowledge concerning the fire resistance of structures and the behavior of the composite system during extreme conditions. Theoretically oriented section also contains information on alkali-activated materials and their use in high temperature environments. Based on the evaluation of the theoretical part of the experiment were designed and tested different types of composite materials with increased content of raw materials from alternative sources. Laboratory research has been based on testing of basic physico-mechanical parameters including phase composition and microstructure of the proposed formulations before and after thermal exposure of 1200 ° C. Also considered was the effect of different cooling conditions.
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Research and development grout and anchor masses
Žlebek, Tomáš ; Petránek, Vít (referee) ; Drochytka, Rostislav (advisor)
Modern anchor and grout systems are now at a high level and they are used in many branches of industry. This thesis evaluates the current state of anchoring and grouting systems, research of currently used material basis, testing procedures and up to date legislation for these types of materials. Above all, the thesis is focused on the chemical types of anchor and grout materials for utilization in industrial production facilities with exposure to extreme loads, a new methodology for testing of these types of materials and input raw materials will be proposed. The final part of this thesis is a proposal of new optimum formulas for anchoring and grouting materials for utilization in industrial production facilities with exposure to extreme loads including the description of their applications.
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Complete insulation system for high temperature using secondary raw materials
Mészárosová, Lenka ; Ďurica,, Tibor (referee) ; Kolář,, Karel (referee) ; Kulísek, Karel (referee) ; Drochytka, Rostislav (advisor)
This work deals with the development of new types of insulating materials for use in the higher temperature. The area of application of these insulation materials is especially industrial chimneys, where the exhaust gases achieves 85 to 200 °C, furthermore it is industrial boilers and furnaces with surface temperature to 500 °C. In the introduction is presented the current knowledge in the field of insulating materials in the Czech Republic and in the world. Then the work is dealing with proposal of possible raw materials and suitable formula. According to purpose of use is the work divided into two parts – high temperature insulation for simple and for complicated shapes conditions. The sub-sections are divided to different possibilities of performance. The aim was, based on the scientific expertise of other authors in the world, design a new insulation system and redound to deepening scientific knowledge in the area of lightweight materials on the silica basis and to the extension of the offer of new products in building and industrial practice.
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Silicate Conductive Composites with Graphite Fillers
Baránek, Šimon ; Drochytka, Rostislav
Electroconductive composites are modern materials that are commonly used in many industries such as construction industry and machine-building industry. For example, these materials can be useful as sensors for monitoring changes in constructions, shielding stray currents from electrification networks, shielding electromagnetic radiation in operating rooms, cathodic protection against moisture or overvoltage protection of buildings. The topic of this post is the research of electrically conductive silicate composites with graphite-based fillers. In this research, composites with different ratios and types of graphite were tested and electroconductive properties such as impedance were monitored, as well as physical-mechanical properties such as strength. It was found that by adding 10 wt. graphite into the mixture reduces the impedance of the composites by 50 % and the compressive strength is reduced by approximately 40 %.
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Complete insulation system for high temperature using secondary raw materials
Mészárosová, Lenka ; Ďurica,, Tibor (referee) ; Kolář,, Karel (referee) ; Kulísek, Karel (referee) ; Drochytka, Rostislav (advisor)
This work deals with the development of new types of insulating materials for use in the higher temperature. The area of application of these insulation materials is especially industrial chimneys, where the exhaust gases achieves 85 to 200 °C, furthermore it is industrial boilers and furnaces with surface temperature to 500 °C. In the introduction is presented the current knowledge in the field of insulating materials in the Czech Republic and in the world. Then the work is dealing with proposal of possible raw materials and suitable formula. According to purpose of use is the work divided into two parts – high temperature insulation for simple and for complicated shapes conditions. The sub-sections are divided to different possibilities of performance. The aim was, based on the scientific expertise of other authors in the world, design a new insulation system and redound to deepening scientific knowledge in the area of lightweight materials on the silica basis and to the extension of the offer of new products in building and industrial practice.
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Composite materials with silica matrix in the environment of high temperatures
Lisztwanová, Ewa ; Luňáček,, Martin (referee) ; Bydžovský, Jiří (advisor)
This thesis deals with the study and design of composite materials based on silica matrix suitable for extreme conditions, eg. for the repair of concrete structures with anticipated increased risk of fire. The theoretical part summarizes basic knowledge concerning the fire resistance of structures and the behavior of the composite system during extreme conditions. Theoretically oriented section also contains information on alkali-activated materials and their use in high temperature environments. Based on the evaluation of the theoretical part of the experiment were designed and tested different types of composite materials with increased content of raw materials from alternative sources. Laboratory research has been based on testing of basic physico-mechanical parameters including phase composition and microstructure of the proposed formulations before and after thermal exposure of 1200 ° C. Also considered was the effect of different cooling conditions.
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|
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Research and development grout and anchor masses
Žlebek, Tomáš ; Petránek, Vít (referee) ; Drochytka, Rostislav (advisor)
Modern anchor and grout systems are now at a high level and they are used in many branches of industry. This thesis evaluates the current state of anchoring and grouting systems, research of currently used material basis, testing procedures and up to date legislation for these types of materials. Above all, the thesis is focused on the chemical types of anchor and grout materials for utilization in industrial production facilities with exposure to extreme loads, a new methodology for testing of these types of materials and input raw materials will be proposed. The final part of this thesis is a proposal of new optimum formulas for anchoring and grouting materials for utilization in industrial production facilities with exposure to extreme loads including the description of their applications.
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