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Evaluation of properties of lime mortars
Babíková, Barbora ; Švec, Jiří (referee) ; Opravil, Tomáš (advisor)
This bachelor thesis deals with evaluation of properties of lime mortars and their application in field of restoration and preservation of cultural heritage. The aim of this works is to compile evaluation line of different types of lime mortars based on comparison of their behavior during testing of their characteristic properties and resistance. Studied properties like setting time, compressive strength, tensile strength in bending, frost resistance, reactivity, content of free lime, loss of mass on ignition, point to applicability of given mortar in different interior or exterior conditions. The results of individual tests are further processed and evaluated.
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Tightness evaluation of gasketed tubesheet
Trubač, Daniel ; Pernica, Marek (referee) ; Létal, Tomáš (advisor)
This master thesis focuses on the issue of tightness evaluation of gasketed tubesheet in U tube exchangers, which meets strength requirements of ČSN EN 13 445-3 and ČSN EN 1591-1 standards. It deals with the forces acting on the gasket when measuring the effects acting on the entire heat exchanger. A separate part is devoted to the calculation of the heat profile in the heat exchanger and verification of the strength of the heat exchanger. The final part introduces model of a heat exchanger, on which a possible approach to solving the tightness of the tubesheet in heat exchangers is presented. In thesis temperature field evaluation was conducted, the results of which were used in stress strain analysis, in order to obtain gasket contact pressure. Extreme gasket contact pressures were used to estimate leak rate limits.
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Solder Joint Strength Measuring
Konečný, Aleš ; Chladil, Ladislav (referee) ; Starý, Jiří (advisor)
This thesis studies the definition of solder joint strength and its contributing factors. It also evaluates the options provided by using a MARK10 M5-100 digital force gauge with MESURgauge software for measuring solder joint strength and practically tests solder joint strength of SMD components sized 1206, 0805 and leads of THT components. Based on this, the thesis suggests further tests to be done in order to evaluates the degree to which each factor affects solder joint strength and suggests possible improvements of testing procedures used. These tests and improvements will be explored by a follow-up thesis, which will also be creating a part of a guide to a new laboratory exercise.
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Ultrasonic measurement of large format tiles
Čaněk, Michal ; Topolář, Libor (referee) ; Kocáb, Dalibor (advisor)
The diploma thesis deals with influence of the used adhesive to large format tiles properties after installation. Properties on large format tiles were monitored by ultrasonic pulse velocity method. Hydraulic setting adhesives were tested in second part. Strength and modulus of elasticity were tested. The development of shrinkage over time was also monitored. The results were summarized in tabular and graphical form and were examined by simple statistical analysis to determine resulting conclusions.
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Diagnostics of reinforced concrete structures
Nápravník, Petr ; Komárková, Tereza (referee) ; Láník, Jaromír (advisor)
This thesis deals with the structural-technical survey of beam bridge no. 204c - M1, located in Bystřice pod Hostýnem. The theoretical part of the thesis is devoted to general characteristics of bridges, load capacity of bridges, beam bridges, concrete reinforcement, concrete, diagnosis of reinforced concrete structures, and laboratory evaluation. The practical part deals with carrying out a structural-technical survey on the bridge mentioned above, its evaluation and assessment, recalculation of the load capacity, and design of the necessary rehabilitation to maintain the functionality of the bridge.
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Machining of ceramic bodies using CAD-CAM
Kaplan, Lukáš ; Částková, Klára (referee) ; Kaštyl, Jaroslav (advisor)
The literature part of bachelor's thesis deals with ceramic materials based on Al2O3 and ZrO2, methods of sample preparation for consequent machining, different methods of machining, especially the technology of CNC machining in non-sintered and sintered state with their comparison. The thesis presents possible examples of the use of ceramic parts. The experimental part of the thesis deals with the machining of ceramic based on ZrO2 using different types of ceramic powders, methods of preparation and the choice of the sintered temperature in relation to its properties. The best results were achieved with SZ-3Y ceramic material sintered at 1550 °C for 2 hours, strength values were 1203 MPa, roughness of surface Ra was 126 nm a grain size was 382 nm.
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Determination of Vuppor admixture for the refractory light weighting bodies
Svobodová, Markéta ; Keršner, Štěpán (referee) ; Sokolář, Radomír (advisor)
Lightweight refractory products are materials used for the construction of certain parts of industrial furnaces, especially for iron, but also in other sectors where is operated with high temperatures. There are special requests on refractories. The theoretical part contains an overview of used raw materials, production and properties of lightweight refractory products and description of not burnable lightener - chemical additives VUPPOR I and information about previously conducted trials dealing with these topics. The practical part is divided into four parts, which are evaluated by tests which were performed on a refractory clay with chemical additive Vuppor I (samples are lightened and not lightened) - it was primarily a test of sensitivity to drying, density, compressive strength, thermal insulating properties, etc.
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