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The issue of determination of the static modulus of elasticity of concrete in structures
Halamová, Romana ; Misák, Petr (referee) ; Kocáb, Dalibor (advisor)
The thesis deals with the measurement of the elastic modulus of concrete in existing structures and possibilities of applicability of equations for the calculation of characteristic values of concrete compressive strength on the modulus of elasticity. The modulus of elasticity is determined by dynamic and static methods on specimens taken from the concrete blocks, whose composition varies by a water cement ratio and varying amounts of admixtures. In conclusion, the results of the measurements are compared and the characteristic values of the modulus of elasticity is determined.
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Building survey and evaluating the state of construction
Balash, Alan ; Anton, Ondřej (referee) ; Heřmánková, Věra (advisor)
This diploma thesis is focused on building survey and evaluating of the state of the three-storey industrial hall. The diploma thesis consists of two parts - theoretical and practical. In the theoretical part is described a common procedure for evaluation of the state of existing structures, methods used in diagnostics (selected ones - more detailed), advantages and disadvantages of methods. In the practical part is carried out construction and technical survey of the industrial hall, the concrete strength evaluation and verification of presence and type of reinforcement. At the end of the work - evaluation of objects.
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The Use of Non-Destructive and Destructive Testing Methods for the Determination of the Compressive Strength of Concrete
Fučík, Petr ; Cikrle, Petr (referee) ; Kocáb, Dalibor (advisor)
This thesis deals with the summary of hardness test methods, their principles and types of devices used for nondestructive measurement of hardness test, including the latest devices and their description. It describes the basic relationship between hardness and compressive strength as well as procedures for obtaining the compressive strength of concrete in the structure. It provides an overview of testing methods by two normative approaches of processing and evaluation. The experimental part deals with the measurement on concrete parts using devices OriginalSchmidt type N, SilverSchmidt type N and SilverSchmidt type L, testing concrete compressive strength on cores and development of regression curve of these values.
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Survey and Evaluation of Reinforced Concrete Structure
Ježíková, Pavlína ; Anton, Ondřej (referee) ; Cikrle, Petr (advisor)
This diploma thesis focuses on the construction survey of the building where the University Cinema Scala and the Bolek Polívka theatre is located. The building will celebrate its 100th birthday in 2028 and its author is the builder Jaroslav Josef Polívka. The survey concerns reinforced frame constructions. The compressive strength of concrete cores and type of reinforcement was determined and non-destructive and destructive diagnostic tests were used. The first aim of the survey was to collect materials for a static report due to the planned superstructure but a visual inspection of the construction was performed and serious failures were found. For these reasons, the closure of the building was necessary. Last part of the thesis is the design of the reinforcement, if the same structure was designed according to the currently valid Eurocodes, but with the use of original materials; as well as a comparison of the designed reinforcement with the actual reinforcement.
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Diagnostics and assessment of prefabricated reinforced concrete structures
Kocuba, Robert ; Láník, Jaromír (referee) ; Cikrle, Petr (advisor)
This thesis deals with inspection and constructionally technical research of reinforced concrete prefabricated construction from the second half of 20th century. In theoretical part, the research of literature, documents and valid standards is performed, with a focus on production and construction of prefabricated elements and also on the metodology of research. In practical part, the detection of reinforcement of individual elements of the construction and concrete properties is performed. The result of this work is the assessment of the state of the construction, static calculation of the ceiling panel and idea proposal for eventual reconstruction.
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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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Verification of the possibilities of using mixed cements CEM II and CEM III for concrete roads and bridges
Kepák, Ondřej ; Slánsky,, Bohuslav (referee) ; Hela, Rudolf (advisor)
Bachelor thesis focuses on verifying the possibilities of using blended cements CEM II and CEM III for concrete roads and bridges. The objective of the thesis was to verify the possibilities of the safe use of these cements. In the theoretical part, an overview of the types of cement produced in the Czech Republic is developed, including their characteristics and the state of use of blended cements in the world. In the experimental part are then presented the properties of the concrete produced from selected blended cements and compared with the reference cement without the addition of secondary raw materials.
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Effect of the Combination of Blast-Furnace Finely Ground Granulated Slag and Inert Admixtures on Physical-Mechanical Parameters of Concrete
Meruňka, Milan ; Hela, Rudolf
This paper deals with the combination of blast furnace finely ground granulated slag (VJMGS) in an optimal ratio with an inert admixture. The aim of this work is to verify the influence of the mutual combination of admixtures on the physical-mechanical parameters of the concrete mixture, specifically the compressive strength of concrete. The obtained results suggest that even with half the dose of VJMGS in the mixture it is possible to obtain very similar physical-mechanical parameters of concrete in comparison with the recipe containing only VJMGS, which can be advantageous not only from an economic point of view but also from an ecological point of view.
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Building survey and evaluating the state of construction
Balash, Alan ; Anton, Ondřej (referee) ; Heřmánková, Věra (advisor)
This diploma thesis is focused on building survey and evaluating of the state of the three-storey industrial hall. The diploma thesis consists of two parts - theoretical and practical. In the theoretical part is described a common procedure for evaluation of the state of existing structures, methods used in diagnostics (selected ones - more detailed), advantages and disadvantages of methods. In the practical part is carried out construction and technical survey of the industrial hall, the concrete strength evaluation and verification of presence and type of reinforcement. At the end of the work - evaluation of objects.
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