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Development of polymer repair materials using secondary raw materials
Juřička, Viktor ; Vyhnánková, Michaela (referee) ; Drochytka, Rostislav (advisor)
The diploma thesis deals with the development of polymeric repair mortars in two qualitative levels ECONOMY and PREMIUM, designed especially for heavy engineering plants and the energy industry. In order to effectively withstand difficult industrial conditions, the developed materials should meet the highest requirements such as increased chemical and heat resistance, excellent adhesion to the concrete substrate, minimal shrinkage and other physical and mechanical properties. The PREMIUM level is aimed to achieve maximum physical and mechanical properties. Within the economy version, the emphasis is placed not only on very good properties, but also the possibility capability of reducing price of the resulting material. The partial aim of this work is the efficient use of secondary raw materials, mainly based on industrial waste in the form of fillers to the developed polymeric repair mortars.
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Development of industrial adhesive material for deposition of nonabsorbent components
Bergerová, Kamila ; Černý, Vít (referee) ; Drochytka, Rostislav (advisor)
The thesis deals with the development of industrial adhesive material for deposition of nonabsorbent components in environments exposed to aggressive chemicals and high temperatures. The theoretical part is mainly focused on summarizing knowledge about adhesive materials. The study also includes description of bonded components, describes theory of adhesion and introduces the used materials. The primary aim of this work is to present new design of material composition of a new adhesive of polymer and silicate base material. The work also investigates the possibility of using the industrial waste in the form of secondary raw material. The final part is dedicated to laboratory testing of new developed materials, summarization and discussion of the obtained results.
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Study efficiency of modern thermal insulations for buildings
Holeček, Dominik ; Skříček, Darek (referee) ; Šťastník, Stanislav (advisor)
The bachelor thesis is partly dedicated to energetic efficiency of buildings and describes possibilities how to evaluate energetic efficiency of buildings in the Czech republic. There is also detailed description of the heat transfer in buildings. We also get to know with production and characteristics of chosen thermal insulators. There are also mentioned methods how to determine thermal insulations characteristics of heat insulations, so called heat conductivity coefficient. The last and the crucial chapter of theoretic part is dedicated to thermo-reflective insulations. There are mentioned some of the basic characteristics of insulations and its material composition as well as usage and methods of thermo-reflective insulations installation in buildings. Practical part is dedicated to description of chosen samples of thermo-reflective insulations and determination of their heat resistance though Hot Box measuring method.
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Mortar with alkali-activated matrix
Černá, Hana ; Hela, Rudolf (referee) ; Bodnárová, Lenka (advisor)
The thesis addresses the issue of alkali-activated materials and their manufacturing components. In the theoretical part the description of such materials is provided and the requirements for source materials are defined. The theoretical part further addresses the resistance of alkali-activated materials and their lifespan - namely sulphate resistance, chloride resistance, acid resistance, frost resistance, porosity, carbonation, resistance, abrasion resistance and heat resistance. The experimental part of the thesis focuses on compounding four different mixtures of alkali-activated materials. In the loosened stage, the weight was measured. In the hardened stage the weight was measured as well as the tensile strength when bending, the strength under pressure applied, heat resistance, water and defrosting chemicals resistance and formation of cracks.
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Thorium in environment
Adam, Rostislav ; Soudek, Petr (advisor) ; Petrová, Šárka (referee)
All known isotopes of thorium are radioactive, 6 of them occur in nature decay chains. Thorium forms mainly cation Th4+ . Because thorium behaves like REE, Ce, Zr, Hf, Sc and U, it is a problem with thorium separation. There is requested leach thorium from ore for production of thorium. Monazite is mostly used for industrial production of Thorium. Electrolysis or chemical reduction are the most spread technologies for metal thorium production. For determination of thorium can be used many methods. Currently there is are usualy used radio-spectrometry or mass-spectrometry for determination of Thorium. Thorium occurs in small amounts in all parts of environment. Most of naturally occuring thorium are in the solid part of environment. Radioactive decay of thorium are using in geochronology. Thorium could be use in future as nuclear reactors fuel. Some other usage of thorium are catalyst in organic synthesis, Welsbach lamps or non-silicate glass. Thorium have also some chemical toxic efects for all organism, but more serious problem is its radioactivity. Final product of radioactive decay is lead. Non-stable products are radium, radon, bismuth, thalium and polonium. All products of radioactive decay have some specific chemical toxicity. 1
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Study utility properties of heat-reflective insulation for the buildings
Rauchfussová, Karolína ; TROJAN,, Karel (referee) ; Šťastník, Stanislav (advisor)
Presented work deals with the study progressive heat-reflecting foil thermal insulating materials and defines their thermal insulation properties. The work describes a transport mechanism of thermal energy in the structure of heat-reflecting materials, their physical properties, especially heat resistance, compared to the conventional thermal insulating materials available on Czech market. The main applications ways and installation methods of these materials (especially in low-energy and passive buildings) are also shown. The practical part is focused on asembling the measuring device HOT BOX in accordance with the valid standards, to determine the heat resistance of heat-reflecting materials. In next step the measurement of reflection of aluminum foils (an integral part of the structural arrangement heat-reflecting foil insulations) was performed.
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The Effect of Sawdust on the Refractoriness of Insulation Chamotte
Smékalová, Veronika ; Kotásek, Martin (referee) ; Sokolář, Radomír (advisor)
Lightweight refractory products have their place between refractory materials. Still the most common way of lightweighting is by using burnable components. This bachelor work includes the theoretical part, which deals with raw materials for lightweight fireclay, manufactory, and also testing lightweight refractory products. The second part of this work deals with foreign research and its results in this area. The practical part examines the influence of the types of sawdust (spruce or beech) on properties of lightweight refractory materials. The work focuses mainly on heat resistance, temperature usability, thermal conductivity, and density. These properties are evaluated with consideration to the ash which is created by burning sawdust.
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Determination of thermal properties of gloves by means of thermal manikin
Pidrová, Kateřina ; Pokorný, Jan (referee) ; Fišer, Jan (advisor)
This diploma thesis is focused on determination of thermal properties of gloves by means of thermal manikin. The background research with relation to this topic together with derivation of the computational equations used for the following measurement are presented in the first part. The most significant part of this work is suggestion of procedure for measuring the heat resistance of gloves with thermal manikin based on procedure from ČSN EN 511. This methodics was verificated with 5 pairs of gloves together with analysing the uncertainties and testing the repeatability of this measurement. This work also contains the outline for all of the measured pairs with posibilities of their usage in specific situations and surrounding air temperatures. At the end of this work is mentioned brief summary of achieved results.
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Evaluating and modeling of fouling process in heat exchanger
Čirka, Martin ; Kilkovský, Bohuslav (referee) ; Jegla, Zdeněk (advisor)
This diploma thesis discusses fouling processes and mechanisms of industrial heat exchangers, with focus on shell side fouling of heat transfer area by flue gases, and eventually taking fouling into account, or more precisely its modeling and predicting by calculation. Thermal-hydraulic design of heat exchanger is focused mainly on shell side, as flue gases are dominant process medium in terms of fouling and heat transfer. Based on available operational data of evaluated industrial heat exchanger, specific process has been developed to determine by calculation, or more precisely predict change of fouling factor throughout operational period of heat exchanger. Usage and various options of this specific calculation technique are being discussed in conclusion, whether there is a potential to use this technique regarding more complex operational inputs or prediction of fouling process for different operational regime of heat exchanger.
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Sports complex
Touš, Jakub ; Pobořil, Lukáš (referee) ; Petříček, Tomáš (advisor)
The main focus of this thesis is to design the expansion and modernization of a sport complex "U Jezu" for a sport club TJ Roztoky. This thesis is consisted of a study for a territorial agreement. In this study, there are indicated a formation of two playing fields with the artificial surfaces, beach volleyball court proposing two building objects as a base for the entire complex, which consists of garages, storages and a main building. A more detailed design was created for the main building. As the supporting structure of the object, the transverse wall system completed with outdoor columns supporting the cantilevered portion of the ceiling tiles, which are mainly unidirectionally reinforced concrete floor slabs. The supporting structure is based on the strip foundations. The designed building object has two-above ground floors and a ground floor, which will be created by embedding the building object into the hill side. The ground floor is designed for the relaxation and the leisure purposes. Moreover, there is also a technological equipment necessary for the operation of the facility. On the first above ground floor, there are designed locker rooms for athletes, a club room with a kitchen and an accommodation unit for a manager of the complex. The second floor is for the accommodation. There are designed rooms with lounge and office of the president of the sport club. Part of the second floor consists of a terrace. For the roofing, a flat roof with a single-classic sequence of layers is designed. In this thesis, the static is partially solved. Furthermore, the object is evaluated in the terms of lighting, acoustic and thermal requirements as well as requirements for the fire safety of buildings.
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