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Risk analysis of building design with regard to the selected material characteristics
Jirásková, Iveta ; Vymazal, Tomáš (referee) ; Misák, Petr (advisor)
This thesis focuses on the verification of physical and mechanical characteristics of hardened concrete, especially concrete compressive strength, static and dynamic modulus of elasticity. The job description is to perform a series of laboratory analyzes for structural concrete and evaluate the test results meet requirements that are specified in the European standards for designing buildings. The work also includes selected techniques for risk assessment (FMEA, Pareto diagram, Ishikawa diagram) and their application to selected process. Part of the work is also a static comparison of measured characteristics and consideration of the risks associated with variations in the monitored quantities.
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Study of concrete properties in extreme climatic conditions
Stará, Tereza ; Novosad,, Petr (referee) ; Hubáček, Adam (advisor)
The bachelor thesis deals with the study of concretes that are exposed to extreme climatic conditions during their service life. Many concrete structures around the world are exposed to various climatic conditions during their service life, such as high temperatures or, conversely, low temperatures. These conditions affect the properties of concrete both in its fresh and hardened state and have an impact on its durability. This thesis summarises the existing knowledge of the behaviour of concrete in these conditions, and describes suitable input materials that can be used for these environments. Furthermore, the thesis describes the possibilities of improving the durability and resistance of concrete to these climatic conditions. In the experimental part, selected durability parameters of concrete are monitored during its exposure to climatic stresses.
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Change in the durability of concrete made of recycled concrete by alternative addition of ceramic admixtures
Stavař, Tomáš ; Hoffmann, Oldřich (referee) ; Stehlík, Michal (advisor)
The master thesis dealing with problematic about durability of concrete, with use of recycled concrete and addition of silica additions. Predominant for resistance of concrete constructions is surface layer, through which aggressive gasses and liquids penetrate from surrounding environment. The most important indicator of concrete durability is ability of surface layer transmissions of aggressive substants. In experimental part will be defined the actual state of surface layer by normal testing methods. The transmissions of surface layer will be tested on concrete cubes. Tests for transmissions of air (method TORRENT), of water (method ISAT), of acid gases (dept of carbonation by quick test in 98% CO2) will be carried out and also strength tests. Assessment of positive or negative influence of additions and amount of cement on durability and mechanical properties of concrete will be discussed in conclusion.
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Study of concrete properties in extreme climatic conditions
Stará, Tereza ; Novosad,, Petr (referee) ; Hubáček, Adam (advisor)
The bachelor thesis deals with the study of concretes that are exposed to extreme climatic conditions during their service life. Many concrete structures around the world are exposed to various climatic conditions during their service life, such as high temperatures or, conversely, low temperatures. These conditions affect the properties of concrete both in its fresh and hardened state and have an impact on its durability. This thesis summarises the existing knowledge of the behaviour of concrete in these conditions, and describes suitable input materials that can be used for these environments. Furthermore, the thesis describes the possibilities of improving the durability and resistance of concrete to these climatic conditions. In the experimental part, selected durability parameters of concrete are monitored during its exposure to climatic stresses.
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Risk analysis of building design with regard to the selected material characteristics
Jirásková, Iveta ; Vymazal, Tomáš (referee) ; Misák, Petr (advisor)
This thesis focuses on the verification of physical and mechanical characteristics of hardened concrete, especially concrete compressive strength, static and dynamic modulus of elasticity. The job description is to perform a series of laboratory analyzes for structural concrete and evaluate the test results meet requirements that are specified in the European standards for designing buildings. The work also includes selected techniques for risk assessment (FMEA, Pareto diagram, Ishikawa diagram) and their application to selected process. Part of the work is also a static comparison of measured characteristics and consideration of the risks associated with variations in the monitored quantities.
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Change in the durability of concrete made of recycled concrete by alternative addition of ceramic admixtures
Stavař, Tomáš ; Hoffmann, Oldřich (referee) ; Stehlík, Michal (advisor)
The master thesis dealing with problematic about durability of concrete, with use of recycled concrete and addition of silica additions. Predominant for resistance of concrete constructions is surface layer, through which aggressive gasses and liquids penetrate from surrounding environment. The most important indicator of concrete durability is ability of surface layer transmissions of aggressive substants. In experimental part will be defined the actual state of surface layer by normal testing methods. The transmissions of surface layer will be tested on concrete cubes. Tests for transmissions of air (method TORRENT), of water (method ISAT), of acid gases (dept of carbonation by quick test in 98% CO2) will be carried out and also strength tests. Assessment of positive or negative influence of additions and amount of cement on durability and mechanical properties of concrete will be discussed in conclusion.
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Properties of concrete with the addition of plasma modified polypropylene fibers
Vorel, Pavel ; Herka, Petr (referee) ; Bodnárová, Lenka (advisor)
Master‘s thesis focuses on concrete combined with polypropylen fibres produced commercially, fibres without surface modifications and fibres modificated by plasma. Most important topic of the thesis is experimental verification of influence of plasma modificated fibres on attributes of fresh concrete and physical-mechanical attributes of solidified concrete. Based on the results of the tests perfomed on examin units compares results and anylyses applicability of different fibre surface modifications.
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Cement composite materials with polypropylene fibers
Preisner, Martin ; Hela, Rudolf (referee) ; Bodnárová, Lenka (advisor)
This thesis deals with summarizing the possible effects of the addition of polypropylene fibers, especially low temperature plasma treated on the properties of cement composites and concrete. They are given basic information and distribution of polypropylene fibers. It describes the finish polypropylene fiber low-temperature plasma. The experimental part focuses on the effect of dispersion of polypropylene fibers treated plasma in the cement matrix.
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