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Study of the dependence of concrete composition on the values of elasticity modules
Křížová, Klára ; Kolář,, Karel (referee) ; Adámek, Jiří (referee) ; Ďurica,, Tibor (referee) ; Hela, Rudolf (advisor)
The modulus of elasticity is one of the basic characteristics of concrete defining elastic deformation of concrete and it plays a significant role in the static design of structures. Due to current trends in concrete technology, offering a wide variability in the proposals of the composition of concrete, there are changes not only in strength characteristics but also in the modulus of elasticity of concrete. The aim of this doctoral thesis is to study the dependence of different compositions on modulus of elasticity of concrete. Design of concrete composition is prepared with respect to the use of different types of cement, mineral admixtures, types and fractions of aggregates. The work is mainly focused on the determination of static modulus of elasticity in compression with the addition of dynamic modules. In the first phase determined modulus of elasticity are compared with tabulated values according to Eurocode 2, which are derived for the specific strength class of concrete. Part of this work is the compilation of the main technological aspects of concrete which can favorably affect the modulus of elasticity.
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Usage of foam bitumen technology
Machel, Ondřej ; Komenda, Radek (referee) ; Hýzl, Petr (advisor)
The diploma thesis deals with the production of warm mix asphalts, using the foam bitumen technology. The thesis is divided into theoretical and practical part. The theoretical part is focused on the basic division of roadway constructions, particularly on warm mix asphalts. The aim of the practical part was to find out whether the produced asphalt mixture retains its functional properties when the operating temperature is reduced. For this purpose, two asphalt mixtures of the ACO 11+ type at operating temperature of 150 °C and reduced operating temperature of 130 °C were made. Functional tests and empirical and functional tests were carried out on the produced asphalt mixtures and the extracted bitumen binders respectively. In the conclusion of the thesis, the results of the tests are mutually compared.
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Foam asphalt mixtures
Brtníková, Tereza ; Komenda, Radek (referee) ; Hýzl, Petr (advisor)
The diploma thesis is divided into theoretical and practical part. The theoretical part is mainly focused on methods for reducing the working temperature in the production of hot mix asphalt and the main reasons for this. Most attention is paid to the warm mix asphalt, mainly foam asphalt technology. In practical part are describes working procedures of individual tests on asphalt mixtures and recovered bitumen binders. The tests were performed on 3 types of ACO 11+, one was made with working temperature 160°C without foamed bitumen and the other two with foamed bitumen,one with working temperature 160°C and the second 140°C. Then were the results compared.
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Usage of foam bitumen
Prídavková, Natália ; Stehlík, Dušan (referee) ; Hýzl, Petr (advisor)
The aim of this bachelor thesis was to describe the issue of foam bitumen technology in the production and paving of asphalt mixtures. The first chapter is devoted to the contexts needed to understand the issues of reducing production temperatures and the use of warm mix asphalt (WMA), especially foamed bitumen. The second chapter is aimed to understand the concept of warm mix asphalt and explains the production technology of foamed bitumen and the asphalt foam properties. The penultimate and most comprehensive chapter is an overview of commercial products, practices and experience with foamed bitumen abroad, where WMA technologies are more widespread. The results of these studies show that foaming processes, as well as other types of WMA, are more ecological equivalent to commonly used hot mix asphalt. The last chapter summarizes the experience in the Czech Republic and its technical standards of foamed bitumen technology.
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Foam asphalt mixtures
Brtníková, Tereza ; Komenda, Radek (referee) ; Hýzl, Petr (advisor)
The diploma thesis is divided into theoretical and practical part. The theoretical part is mainly focused on methods for reducing the working temperature in the production of hot mix asphalt and the main reasons for this. Most attention is paid to the warm mix asphalt, mainly foam asphalt technology. In practical part are describes working procedures of individual tests on asphalt mixtures and recovered bitumen binders. The tests were performed on 3 types of ACO 11+, one was made with working temperature 160°C without foamed bitumen and the other two with foamed bitumen,one with working temperature 160°C and the second 140°C. Then were the results compared.
|
|
|
Usage of foam bitumen technology
Machel, Ondřej ; Komenda, Radek (referee) ; Hýzl, Petr (advisor)
The diploma thesis deals with the production of warm mix asphalts, using the foam bitumen technology. The thesis is divided into theoretical and practical part. The theoretical part is focused on the basic division of roadway constructions, particularly on warm mix asphalts. The aim of the practical part was to find out whether the produced asphalt mixture retains its functional properties when the operating temperature is reduced. For this purpose, two asphalt mixtures of the ACO 11+ type at operating temperature of 150 °C and reduced operating temperature of 130 °C were made. Functional tests and empirical and functional tests were carried out on the produced asphalt mixtures and the extracted bitumen binders respectively. In the conclusion of the thesis, the results of the tests are mutually compared.
|
|
|
Usage of foam bitumen
Prídavková, Natália ; Stehlík, Dušan (referee) ; Hýzl, Petr (advisor)
The aim of this bachelor thesis was to describe the issue of foam bitumen technology in the production and paving of asphalt mixtures. The first chapter is devoted to the contexts needed to understand the issues of reducing production temperatures and the use of warm mix asphalt (WMA), especially foamed bitumen. The second chapter is aimed to understand the concept of warm mix asphalt and explains the production technology of foamed bitumen and the asphalt foam properties. The penultimate and most comprehensive chapter is an overview of commercial products, practices and experience with foamed bitumen abroad, where WMA technologies are more widespread. The results of these studies show that foaming processes, as well as other types of WMA, are more ecological equivalent to commonly used hot mix asphalt. The last chapter summarizes the experience in the Czech Republic and its technical standards of foamed bitumen technology.
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|
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Study of the dependence of concrete composition on the values of elasticity modules
Křížová, Klára ; Kolář,, Karel (referee) ; Adámek, Jiří (referee) ; Ďurica,, Tibor (referee) ; Hela, Rudolf (advisor)
The modulus of elasticity is one of the basic characteristics of concrete defining elastic deformation of concrete and it plays a significant role in the static design of structures. Due to current trends in concrete technology, offering a wide variability in the proposals of the composition of concrete, there are changes not only in strength characteristics but also in the modulus of elasticity of concrete. The aim of this doctoral thesis is to study the dependence of different compositions on modulus of elasticity of concrete. Design of concrete composition is prepared with respect to the use of different types of cement, mineral admixtures, types and fractions of aggregates. The work is mainly focused on the determination of static modulus of elasticity in compression with the addition of dynamic modules. In the first phase determined modulus of elasticity are compared with tabulated values according to Eurocode 2, which are derived for the specific strength class of concrete. Part of this work is the compilation of the main technological aspects of concrete which can favorably affect the modulus of elasticity.
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