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The influence of crystallization additives to waterproof concrete
Rosecký, Pavel ; Louda, Pavel (referee) ; Hela, Rudolf (advisor)
This bachelor´s thesis deals with influence of crystallization additives to waterproof concrete. In the theoretical part is detailed analysis individual components in concrete production, improving waterproofing properties and finally functions and properties of crystallization materials. In the practical part I deal with influence of selected crystallization additives on properties of fresh and hardened concrete.
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Requirements for manager of the construction company
Malková, Darina ; Louda, Pavel (referee) ; Linkeschová, Dana (advisor)
Bachelor’s thesis deals with the requirements for manager of the construction company. The theoretical part focused on manager attributes, knowledge, managerial activities and the ability to lead the team. The practical part bachelor’s thesis based on the hypotheses, which I checked by a questionnaire survey. This survey finds especially which requirements are placed on managers in the construction company and whether students of Faculty of Civil Engineering Brno University of Technology are comply with these requirements.
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Dart control sensing unit for steel tip
Růžek, Václav ; Louda, Jan (referee) ; Musila, Pavel (advisor)
Problematics of sensing position metal darts in targets is new and in this time is no too explored problem. This work analyses accessible method, what can realize this scan. There are lot of accessible methods like best applicable reflect method inductive, based on change inductivity and method capacitive, based on change capacities tabular condenser. Capacitive sensing should be realized by the plate couple, where stiring electrode supplies signal.Sensing electrode receiving this signal. On the basis changes thorough electrostatic field measures change capacities. By the changes capacities fit algorithm we can evaluate, whether is in sensing field visible foreign subject – dart. For capacitive method is also designed driving and scanning unit. Various method were to be laboratory tested and was achieved satisfactory results.
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Influence of fine particles granulometry on the physico-mechanical properties of concrete
Louda, Pavel ; Klečka,, Tomáš (referee) ; Ďurica,, Tibor (referee) ; Hubáček, Adam (referee) ; Hela, Rudolf (advisor)
The theoretical part describes the properties of fine-grained admixtures and the ways how these admixtures modify concrete properties. There are also described ways to assemble grain curves in the range 0-1000 m. The practical part describes the properties of all the concrete components used for the tests. From the admixtures and cement, the individual grain curves were compiled. Curves were assembled in the first stage manually by using MS Excel. Subsequently, a simple program was developed based on the knowledge of composing grain curves, which automatically compiles the grain curve according to the given limits. The maximum cement replacement was set at 25% by weight. The physical and mechanical properties of the graded curves thus established were first verified on mortar mixtures where the workability, bulk density and strength were verified at the age 7, 28 and 90 days. In addition, the porosity of cement cement with mercury porosimetry has been verified for selected recipes. The acquired knowledge was subsequently applied to the concrete in the laboratory. Here the maximum cement compensation was set at 30%. In particular, concrete consistency over time, air content in the concrete and compresive strength of concrete at the age 3, 7, 28 and 90 days were verified. Verification was also carried out in practice on the optimization of self-compacting concrete. Mechanical properties have been retained for optimized recipe but there were financial savings and CO2 emissions reductions compare with the original recipe.
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Advanced Methods for the Solution of Journal Bearing Dynamics
Maršálek, Ondřej ; Louda,, Petr (referee) ; Furch, Jan (referee) ; Novotný, Pavel (advisor)
Náplní této disertační práce je popis komplexní a obecně použitelné strategie výpočetního modelování chování kluzných ložisek, pracujících v režimu smíšeného mazání a uvažujících reálné struktury drsných povrchů obou členů kluzných ložisek – ložiskových pánví a ložiskových čepů. V práci jsou uvedeny a detailně popsány způsoby získání charakteristických popisných dat těchto drsných povrchů a její nedílnou součástí je i popis numerických algoritmů, sloužících k následnému zpracování těchto dat. Dále jsou zde rozebrány implementované výpočetní přístupy k modelování kontaktního tlaku. Ovlivnění hydrodynamické mazací vrstvy kluzných ložisek je dáno velikostí a průběhem faktorů toku, jejichž numerické stanovování je zde detailně popsáno. Alternativní stanovení faktorů toku pomocí analytických funkcí je zde pro úplnost rovněž obsaženo. V závěru práce je uveden popis numerického řešiče modelování chování kluzných ložisek spolu s uvedenými výsledky provedených simulací a jejich diskuzí. Ověření jednotlivých výpočetních modelů, popřípadě porovnání výsledků s výsledky získanými alternativním způsobem, je uvedeno v příslušných kapitolách.
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Possibilities of reducing shrinkage of concrete and development of concrete recipes with limited shrinkage.
Stoklásek, Martin ; Louda,, Pavel (referee) ; Hela, Rudolf (advisor)
The bachelor thesis deals with the issue of volume changes of concrete and their causes. The theoretical part describes the various types of volume changes in concrete and the causes of their occurrence. Influence of concrete mix design and concreting conditions on volume changes. Methods for reducing volume changes are also addressed. The experimental part is focused on the development of recipes with limited volume changes. In which the development of shrinkage is monitored from an early age up to 60 days and at the same time the development of compressive strengths at 2, 7, 28 and 60 days is also monitored.
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Study of the development of short-term strength of concrete at low temperatures
Ďurnek, Jan ; Louda,, Pavel (referee) ; Hela, Rudolf (advisor)
The work deals with the study of the development of compressive strength of concrete at low temperatures. The content of the theoretical part is summarizing of all available information about cements, especially about the properties of cements used for the production of concrete in the Czech Republic. The next chapters deal with plasticizing and super plasticizing additives, which accelerate the hardening and setting of the concrete mixture. A certain part is reserved for the accelerators themselves. The practical part deals with the influence of individual temperatures on the maturation of the concrete mixture, especially on the compressive strength of concrete after 1,2, 7 and 28 days. The conclusion of the work contains an evaluation of the measured results.
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Possibilities of reducing shrinkage of concrete and development of concrete recipes with limited shrinkage.
Stoklásek, Martin ; Louda,, Pavel (referee) ; Hela, Rudolf (advisor)
The bachelor thesis deals with the issue of volume changes of concrete and their causes. The theoretical part describes the various types of volume changes in concrete and the causes of their occurrence. Influence of concrete mix design and concreting conditions on volume changes. Methods for reducing volume changes are also addressed. The experimental part is focused on the development of recipes with limited volume changes. In which the development of shrinkage is monitored from an early age up to 60 days and at the same time the development of compressive strengths at 2, 7, 28 and 60 days is also monitored.
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Influence of fine particles granulometry on the physico-mechanical properties of concrete
Louda, Pavel ; Klečka,, Tomáš (referee) ; Ďurica,, Tibor (referee) ; Hubáček, Adam (referee) ; Hela, Rudolf (advisor)
The theoretical part describes the properties of fine-grained admixtures and the ways how these admixtures modify concrete properties. There are also described ways to assemble grain curves in the range 0-1000 m. The practical part describes the properties of all the concrete components used for the tests. From the admixtures and cement, the individual grain curves were compiled. Curves were assembled in the first stage manually by using MS Excel. Subsequently, a simple program was developed based on the knowledge of composing grain curves, which automatically compiles the grain curve according to the given limits. The maximum cement replacement was set at 25% by weight. The physical and mechanical properties of the graded curves thus established were first verified on mortar mixtures where the workability, bulk density and strength were verified at the age 7, 28 and 90 days. In addition, the porosity of cement cement with mercury porosimetry has been verified for selected recipes. The acquired knowledge was subsequently applied to the concrete in the laboratory. Here the maximum cement compensation was set at 30%. In particular, concrete consistency over time, air content in the concrete and compresive strength of concrete at the age 3, 7, 28 and 90 days were verified. Verification was also carried out in practice on the optimization of self-compacting concrete. Mechanical properties have been retained for optimized recipe but there were financial savings and CO2 emissions reductions compare with the original recipe.
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The influence of crystallization additives to waterproof concrete
Rosecký, Pavel ; Louda, Pavel (referee) ; Hela, Rudolf (advisor)
This bachelor´s thesis deals with influence of crystallization additives to waterproof concrete. In the theoretical part is detailed analysis individual components in concrete production, improving waterproofing properties and finally functions and properties of crystallization materials. In the practical part I deal with influence of selected crystallization additives on properties of fresh and hardened concrete.
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