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Experimental Investigation of the Influence of the Type of Fibres on the Behaviour of Fibre Concrete
Hanuš, Petr ; Vymazal, Tomáš (referee) ; Kocáb, Dalibor (advisor)
This diploma thesis deals with the comparison of different properties of fibre-reinforced concrete according to the type of fibres. The main monitored property is flexural strength, tested on prisms with a cross section of 150x150 mm and a length of 600 mm. Four concretes of natural aggregate and four concrete of lightweight aggregate were prepared for the experiment. There were 2 reference concrete and 6 fibre-reinforced concrete. Three types of fibres were used: steel, polypropylene and glass. More than 2500 kg of concrete was produced. The aim of the thesis is to assess the influence of fibres on the flexural strength and other characteristics of fibre-reinforced concrete.
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The use of the waste aggregates for bound mixtures of pavements
Chloupek, Adam ; Zajíček, Jan (referee) ; Stehlík, Dušan (advisor)
The works deals with the possibilities of using non-standard fraction of fine crushed aggregate in route base layers. Goal of my thesis is research of using material from specific location. Theoretical part summarizes basic knowledge regarding bound mixtures and their normative requirements. Practical part of my thesis describes my various mixture design and following testing and determination of design properties by official and experimental tests. The conclusion summarizes the researched outputs and findings, which confirm the future possibilities of using this material in base layers.
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Determination of principal material directions in tissues of aortic wall
Bogdan, Miloš ; Fedorova, Svitlana (referee) ; Burša, Jiří (advisor)
Main goal of this thesis is to find a way how to determine principal material directions in the tissues of aortic wall at large strains. A method is designed for this purpose on the basis of same principles as the method of detemination of principal strains and their directions using rosette gauges. These principles are consequences of tensor properties. In this work the method is applied for a stiffness tensor instead of strain tensor. An algorithm that calculates with this new method is also made and the required experiments are realised on three samples of porcine aorta. Principal material directions and deviations of the values are calculated for both small and large strains.
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Development of high-strength concrete defined properties with the use of secondary raw materials
Ondráček, Michal ; Vítek,, Jan (referee) ; Ďurica,, Tibor (referee) ; Vymazal, Tomáš (referee) ; Hela, Rudolf (advisor)
Civil engineering development is connected with the application of new construction methods and the development of new building materials. Concrete, as one of the basic building materials, is part of this development. A major turning point in the development of concrete and its properties occurred with the use of new, more efficient plasticizing additives. This allowed to produce concrete with lower water cement ratio, while increasing the strength of concrete. Gradually, the compressive strength of concrete boundary has moved by several levels, when there are currently commonly used concrete with strength of about 100 N/mm2 and with the special methods of concrete production strength range from 250 to 300 N/mm2. A negative aspect of the development of (ultra) high-strength concrete is their energy and economic demands. A characteristic feature of high-strength concrete is a high content of cement and very fine admixtures, especially silica fume. One way to improve the economics of these types of concrete is the application of cheaper admixture based on industrial waste. The content of this work is the observation and description of the properties of high-strength concrete and reactive powder concrete, in which the admixtures were based on industrial waste were applied. Part of this work is the comparison of economic parameters for individual types of concrete.
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Diagnostics of the Bridge Structure
Kněbort, David ; Žítt, Petr (referee) ; Kocáb, Dalibor (advisor)
The bachelor’s thesis deals with the diagnostics of single-span railway bridge over road I/55H at ekm 137,608 (TÚ 2401). The theoretical part of the bachelor’s thesis consists of research applicable standards and technical literature, information on bridge inspection and diagnostics methods suitable for the type of structure. The practical part is focused on the bridge inspection, diagnostics of the construction and evaluation of its results. Based on the results, applicable measures are designed to correct defects and failures of structure.
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Diagnostics of the Bridge Structure
Kněbort, David ; Žítt, Petr (referee) ; Kocáb, Dalibor (advisor)
The bachelor’s thesis deals with the diagnostics of single-span railway bridge over road I/55H at ekm 137,608 (TÚ 2401). The theoretical part of the bachelor’s thesis consists of research applicable standards and technical literature, information on bridge inspection and diagnostics methods suitable for the type of structure. The practical part is focused on the bridge inspection, diagnostics of the construction and evaluation of its results. Based on the results, applicable measures are designed to correct defects and failures of structure.
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Experimental Investigation of the Influence of the Type of Fibres on the Behaviour of Fibre Concrete
Hanuš, Petr ; Vymazal, Tomáš (referee) ; Kocáb, Dalibor (advisor)
This diploma thesis deals with the comparison of different properties of fibre-reinforced concrete according to the type of fibres. The main monitored property is flexural strength, tested on prisms with a cross section of 150x150 mm and a length of 600 mm. Four concretes of natural aggregate and four concrete of lightweight aggregate were prepared for the experiment. There were 2 reference concrete and 6 fibre-reinforced concrete. Three types of fibres were used: steel, polypropylene and glass. More than 2500 kg of concrete was produced. The aim of the thesis is to assess the influence of fibres on the flexural strength and other characteristics of fibre-reinforced concrete.
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|
|
The use of the waste aggregates for bound mixtures of pavements
Chloupek, Adam ; Zajíček, Jan (referee) ; Stehlík, Dušan (advisor)
The works deals with the possibilities of using non-standard fraction of fine crushed aggregate in route base layers. Goal of my thesis is research of using material from specific location. Theoretical part summarizes basic knowledge regarding bound mixtures and their normative requirements. Practical part of my thesis describes my various mixture design and following testing and determination of design properties by official and experimental tests. The conclusion summarizes the researched outputs and findings, which confirm the future possibilities of using this material in base layers.
|
|
|
Development of high-strength concrete defined properties with the use of secondary raw materials
Ondráček, Michal ; Vítek,, Jan (referee) ; Ďurica,, Tibor (referee) ; Vymazal, Tomáš (referee) ; Hela, Rudolf (advisor)
Civil engineering development is connected with the application of new construction methods and the development of new building materials. Concrete, as one of the basic building materials, is part of this development. A major turning point in the development of concrete and its properties occurred with the use of new, more efficient plasticizing additives. This allowed to produce concrete with lower water cement ratio, while increasing the strength of concrete. Gradually, the compressive strength of concrete boundary has moved by several levels, when there are currently commonly used concrete with strength of about 100 N/mm2 and with the special methods of concrete production strength range from 250 to 300 N/mm2. A negative aspect of the development of (ultra) high-strength concrete is their energy and economic demands. A characteristic feature of high-strength concrete is a high content of cement and very fine admixtures, especially silica fume. One way to improve the economics of these types of concrete is the application of cheaper admixture based on industrial waste. The content of this work is the observation and description of the properties of high-strength concrete and reactive powder concrete, in which the admixtures were based on industrial waste were applied. Part of this work is the comparison of economic parameters for individual types of concrete.
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