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Diagnostic methods for the evaluation of the state of timber structures
Štěpánek, Jakub ; Stehlík, Michal (referee) ; Heřmánková, Věra (advisor)
This thesis is dealing with diagnostic methods and methodics of research of timber constructions. Theoretical part is focusing on timber as material for constructions, it's defects, physical and mechanical properties, overview of diagnostic methods and their appropriateness of use. In practical part I am describing performed diagnosis of element of timber construction with focusing on comparing transfer speed of the ultrasonic waves to selected mechanical and physical properties.
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The influence of heavy metal oxides on the properties of cement pastes
Kašpárková, Kateřina ; Rovnaníková, Pavla (referee) ; Vyšvařil, Martin (advisor)
The Bachelor´s thesis is focused on study of the effect of increased content of heavy metals in cement production on the properties of this cement and the effect of addition of heavy metal oxides in cement pastes production. The thesis also deals with structural changes in particular components of cement in the presence of heavy metals. The effect of addition of heavy metal oxides on the properties of cement pastes is demonstrated in the experimental part by determining their mechanical properties, pore structure, and observation of the progress of hydration.
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Founding in region of Velké Bílovice
Moravčík, Martin ; Masopust, Jan (referee) ; Brdečková, Helena (advisor)
Bachelor's thesis got two parts. In teoretical part I examene geology and geomorfology of region Velké Bílovice. Half of practical part analyse laboratory samples that are taken from Velké Bílovice. I tested samples for physical and index properties and mechanical properties. Second half of practical part is design and assessment of gravity wall by EC 1997. Earth pressures are calculated by ČSN 73 0037. Geological conditions for gravity wall are calcareous clays from examined properties and loess by [5]. Assessment was controled with computer program GEO5.
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Titanium oxide and its properties in building materials
Rypák, Peter ; Vyšvařil, Martin (referee) ; Rovnaník, Pavel (advisor)
Theoretical part of thesis deals with conclusion of aquired informations about photocatalysis of titanium dioxide, its influence on properties of chosen building materials and its practic use in research of building materials with abitlity to decompose organic and anorganic matters. Experimental part deals with influence of quantity of titanium dioxide on mechanical strength of tested samples based on alkali activated slag and its ability to decompose organic colorant Rhodamine B
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Artificial stone - methods of preparation and properties
Pluskalová, Barbora ; Bayer, Patrik (referee) ; Rovnaník, Pavel (advisor)
The aim of the thesis „Artificial stone – Methods of preparation and it´s properties“ deals with the various methods and issues concerning the preparation of artificial stone. The thesis presents the summary of materials and various methods suitable for the preparation and points out mechanical properties, including durability of material, which serves as an alternative to natural stone. Further on, the thesis deals with the studies of binding systems based on geopolymers, which are used for the artificial stone preparation. This part of the thesis is associated with the experimental part, which is aimed at choosing the suitable mixing ratio of binder to aggregate in the artificial stone based on metakaolin geopolymer. According to the results of mechanical tests and aesthetic impression the author chose the best composition and then created a decorative element.
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Změna vlastností nerezových ocelí v agresivním prostředí
Dobrovolný, Pavel
The bachelor thesis on the topic: Changing the properties of stainless steels in aggressive environments examines the influence of heat exposure and aggressive environment on mechanical properties of stainless steels. The theoretical part describes the principle of corrosion, possibility of spreading corrosion, selected corrosive environments, types of corrosion and the factors that affect the intergranular corrosion of stainless steels. The practical part deals with verification experiment that consists in finding the influence of corrosion degradation on mechanical properties of stainless steels. Etalons and corrosion exposed samples from various grades of stainless steels were subjected to tensile test. The evaluation experiment was done by comparing the measured values of tensile test. Practical measurements complement metallographic images.
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Technologické metody svařování hliníku a jeho slitin
Pavlík, Zdeněk
The diploma thesis deals with the technology of welding aluminum alloy AW 5754 by a method of arc welding TIG and with covered electrode. Introduction contains information about aluminum alloys and their labeling according to ČSN EN 573-1,2. Additional attention is focused on evaluation of the weld quality according to ISO 10042 and subsequent evaluation of the defects according to ISO 65 20 to 1. In the experimental section was welded samples tested at first by non-destructive methods (visual, capillary, X-ray testing) and followed by a destructive measurement of the weld (evaluation of micro-hardness, macroscopic and microscopic tests, tearing issues). Furthermore, part of weldments was subjected to a laboratory corrosion test in an aggressive environment of a salt chamber and then evaluating of mechanical properties of welds in both methods.
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Posouzení možnosti využití buku v materiálech na bázi dřeva a ve výrobcích
Horníček, Stanislav
The thesis deals with the assessment of the possibilities of using wood in wood-based materials and products. Part of this thesis is a list of basic wood-based materials used in timber construction. Furthermore, assessment of possibility and explanation of wood modification principles. The thesis includes the design of functional element of the product and also experiment examining selected physical properties of the modified beech wood. The aim is to create a basic overview of trends in production, products and in the use of wood-based materials and possibilities of the use of beech wood for these products and materials.
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Numerický model celodřevěného konstrukčního spoje
Staňková, Eliška
Part of bachelor's thesis is numeric simulation of several testing variants of wholewood carpentry joints during mechanical strain. As a type of test was used 3 and 4 spots bend for symmetric and asymmetric loaded joint.There were tested a joints with two different dimensions. Purpose of this test is elaboration, evaluation and comparison of joint behavior. For simulations is monitored the process of Ansys Workbench tool, that means, Individual steps from creation of geometric model trough networking, defining of material attributes, determination of boundary conditions solution to exportation of results. Basic joint designs were taken from destruction tests ongoing within "Design and evaluation of historical construction carpentry joints" project, which followed up the design of wholewood joints and destruction tests. This project is showing complex joint response by using a method based on finite element method. The results of the project will be used for comparison with experimental data and then used to examine alternatives joints.
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Analýza vlivu odklonu vláken v lamelách dřevěného lepeného nosníku na jeho tuhost
Klvač, Ondřej
This thesis deals with the analysis of the influence of deflection of grain in the single slats in the wooden glued beam on its stiffness by the finite element method. It is concerned with the deflection of the grains in single slats and a possible combination of changing these slats in the beam.The ascertainment of overal deformation, stiffness and tension placement in the beam cross- section. The thesis also contains general information from the technical literature regarding the issues of glued beams, manufacture technology, examples of use and a comparison and the measured outcomes of the finite element method. The result of the thesis is to evaluate the deflection laminated beams and determine the optimal arrangement the slats in terms of minimum deflection.
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