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Possibilities of evaluation durability of the surface layer of concrete structures
Blažek, Michal ; Žalud, Oldřich (referee) ; Vymazal, Tomáš (advisor)
The thesis is focused on possibilities of durability evaluation of surface layer of concrete structures. The durability of concrete surface layer usually determines the durability of the structure as a unit. It has to be determined in what environment the structure is situated and what influences it has to face, to set the durability of the structure. There is a several normative prescription to set the resistance of the structure. There is formulated a summary of the most widely used and known prescriptions in the theoretical part of the thesis. It is a lot of effort to estimate the durability of the concrete by estimation of permeability of the concrete surface layer recently. Thus these methods are also formulated in the summary and there are compared the individual outputs of the tests. The permeability and pore structures of the concrete surface layer are crucial parameters for the durability of concrete structure. These parameters influence the construction properties of the concrete as well, thus the thesis is focused on relationship of the pore structure and the strength in press of the concrete.
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Porous elements based on granular materials and inorganic binders
Bulejko, Pavel ; Dohnal, Mirko (referee) ; Svěrák, Tomáš (advisor)
Tato diplomová práce zkoumá možnosti tvorby porézních struktur za použití partikulárních materiálů pojených anorganickými pojivy bez dodatečné tepelné úpravy vypalováním. Jako základní pojiva byly použity portlandský a hlinitanový cement a pojiva na bázi alkalicky aktivovaného metakaolinu (geopolymeru). Jako základní kamenivo byl použit karbid křemíku v různých frakcích podle velikosti částic. Byly taktéž použity další zrnité materiály, např. křemenný písek anebo odpadních materiálů (mleté sklo a porcelán) roztříděných do frakcí podle velikosti částic. Byl sledován vliv složení a množství kameniva na vytváření porézní struktury a tím i na mechanické vlastnosti, které byly testovány pomocí mechanických zkoušek. Pevnostní zkoušky byly provedeny na trámečcích 20 × 20 × 100 mm připravených z testovacích směsí. Granulometrické a fázové složení vstupních surovin bylo studováno metodou laserové granulometrie resp. RTG difrakce. Porézní struktura byla studována metodami rtuťové porozimetrie, dále pomocí světelné a rastrovací elektronové mikroskopie a taktéž pyknometrickou metodou. V rámci charakterizace přepážek (terčíky o průměru 90 mm) připravených z jednotlivých materiálů bylo provedeno stanovení efektivní permeability průtokem vzduchu. Dále byly provedeny testy vzlínavosti kapaliny v připravených materiálech. V závěru práce byly provedeny pokusy o filtraci jemných suspenzí přes uvedené přepážky.
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Design and Realization of Metamaterial
Kovaľová, Soňa ; Drexler, Petr (referee) ; Nešpor, Dušan (advisor)
The thesis discusses the design of periodic resonant structures, studying of their impact to surrounding electromagnetic field and realisation of magnetoinductive lens with potential application in nuclear magnetic resonance imaging. Frequency tuning of structure by variation of different parameters is described. The finite element method in Ansys HFSS was used to analyse the properties of designed structures.
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Measurement of Dialyser-Membrane Diffusion Coefficient
Kašák, Pavel ; Bartoš, Michal (referee) ; Jiřík, Radovan (advisor)
This thesis focuses on the measurement of diffusion coefficient of dialysis membrane. The first part describes possibilities of membrane modelling. Basic models, which allow us to determine the basic characteristics of dialysis membranes like permeability and diffusion coefficient, are described. Next chapter deals with basic types and properties of membranes. The main part focuses on making the experimental installation, which is used to simulate permeance of contrast agent, used in DCE-MRI, through dialysis membrane. The last theoretical chapter describes calculations used to estimate diffusion coefficient. Practical part of this thesis uses a designed experimental installation for estimation of diffusion coefficient for two contrast agents Gadovist® and Multihance®.
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Production and characterization of nanoporous alumina membranes
Šimik, Milan ; Márik, Marian (referee) ; Kynclová, Hana (advisor)
The Bachelor thesis mostly deals with manufacturing of membranes with anodic oxidation of aluminium in different conditions. In theoretical part are studied processes leading to creating of porous alumina and methods of measuring permeability of membranes. Practical part is aimed on manufacturing porous alumina with different conditions, which are afterwards suffused into form and diffuse characterized. Measured parametres are interpreted and compared with each other.
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The Brownfields solutions within the Czech Republic - Tepna Nachod
Michalíková, Petra ; Řehák, Filip (referee) ; Pavlovský, Tomáš (advisor)
The diploma thesis follows up the area in the center of Náchod along the former textile factory Tepna, which is located at the transition between the historical center and the housing estate. The proposal is based on problem analysis and uses the potential, limits and quailities of the area. The concept is a new urban quarter with a residential block of buildings complemented by civic amenities and high-quality public spaces. The design preserves the existing building of the Bílá Tepna, for which a new functional use is proposed. The proposal is solved with respect to the character of the place, the connection to the surrounding buildings and the emphasis on the preference of pedestrian traffic over the automobile traffic.
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CITY HALL - RES PUBLICA, The administrative center of the district of Brno-sever
Tománková, Michaela ; Rudiš, Viktor (referee) ; Oplatek, Jiří (advisor)
The subject of the diploma project is the design of new townhall building of district Brno – The north. The townhall is designed at the place of existing barracks and the urbanistic plan of whole area was the previous school work. The townhall as a new centre of the district is dominant in its location, the main motive is openness and permeability. The volume is created from two basic cubes with offices which define public space between with indoor public square and specific volumes of halls in dynamic composition. Communication structure is formed by footbridges and staircaises connecting all volumes. The building combines reinforced concrete and steel structure and is covered by glass shell around.
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Influence of high temperatures on concrete properties
Klobása, Jan ; Křížová, Klára (referee) ; Sedlmajer, Martin (advisor)
The aim of this bachelor thesis is to study the problem of the behavior of concrete under high temperatures. The theoretical part of the work summarizes the knowledge about the changes that take place in concrete when it is exposed to a high thermal load that simulates the effects of fire. It also summarizes the effect of high temperatures on the behavior of the individual components that make up concrete. Emphasis is placed on describing the possibilities of eliminating concrete damage at high temperatures. Furthermore, the principles of changes and events due to high temperatures simulating the effect of fire are described. The experimental part summarizes the knowledge related to the composition of concrete, the use of different types of fibers, and other measures in loading concrete at high temperatures. Steps influencing the negative impact on the properties and resistance of concrete to high temperatures are also described. Based on the summarized findings, conclusions are formulated.
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The Brownfields solutions within the Czech Republic - Tepna Nachod
Froňková, Dominika ; Řehák, Filip (referee) ; Pavlovský, Tomáš (advisor)
The thesis deals with the design of the area after the former brownfield of Tepna Náchod. The aim of the thesis is activate the territory, to revive the city center and to design the buildings in connection with the historical center and the chateau with a suitable functional structure, responding to the city's shortcomings. The proposal respects the character of the place trying to prefer pedestrian and cycling – pedestrian zones, cycling zones. The concept is based on the maximum use of built-up areas in the designed area and on the permeability of the entire area, the interconnection of three squares and the creation of a new public space. Furthermore, the concept responds to the historical city center and the chateau hill - views, perspective axes. Newly designed buildings are residential buildings with active parterres, administrative building for research and development, multi-purpose hall, retirement home, kindergarten, federal house and parking house. The new development clearly defines the street network. Part of the design is the planting of a park under the chateau hill with the revival of the trough of the Plhovsky´s stream.
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