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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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Testing ways of use of secondary raw materials replacing naturals aggregate.
Vašek, Tomáš ; Holák, Michal (referee) ; Hela, Rudolf (advisor)
Master's thesis consists of two parts, theoretical and practical. In the theoretical section are listed basic information about alternative aggregates used for concrete mixture, like polystyrene, cinder and recycled concrete. Further, the influence of these alternative aggregates, used as secondary raw materials, on the behaviour and properties of fresh respectively hardened concrete. Possibilities of application concrete containing secondary raw materials are mentioned. In the practical part are experimentally verified physical and mechanical properties of concrete containing crushed waste polystyrene beads, furthermore thermal insulation properties and resistance to elevated temperatures is tested. Influence of heating plant cinder powder as active addition to concrete mixture was tested. As a next is prepared concrete with replacement of coarse aggregate by cinder and recycled concrete and tested. The influence of these secondary raw materials on workability, compressive strength, frost resistance and water permeability of concrete is also defined. The last part of research is focused on recycled concrete such as main material used in mixture of aggregates bonded with cement, dispose for base layers in roads. In conclusion are discussed results from experimental research and summary of knowledge’s about using polystyrene, cinder and recycled concrete as aggregates for concrete mixtures.
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The screw conveyor of aggregate
Novák, Pavel ; Jonák, Martin (referee) ; Řezníček, Milan (advisor)
This bachelor's thesis deals with the design of the screw conveyor for transport of aggregate. It consists of a technical report containing mainly conceptual design of the entire device, calculation of the main dimensions, design a functional drive and choice of flexible shaft coupling, load calculation, selection and checking of bearings and strength control of structural components, plus drawings, which consists of a set of proposed installation, detailed subassemblies of the attachments of worm shaft in all bearings, welding subassemblies of the trough and production drawing of the input pin.
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The inclined belt conveyor
Potočník, Jan ; Hloska, Jiří (referee) ; Kašpárek, Jaroslav (advisor)
This bachelor thesis deals with the design of the belt conveyor for aggregate. The thesis contains the description of the belt conveyor, functional device calculation by norm ČSN ISO 5048, the determination of main dimension, the design of the drive device and the strength calculations. The technical drawings are attached to the thesis.
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Portable Belt Conveyor for aggregates and crushed rubble
Krbeček, Petr ; Malášek, Jiří (referee) ; Škopán, Miroslav (advisor)
This bachelor thesis deals with the construction design of the portable belt conveyor for aggregate and crushed rubble. The thesis contains the description of basic parts of the belt conveyor and their choice. It also contains a functional calculation according to the valid norm ČSN ISO 5048, the determination of main dimensions of the belt conveyor, the design of the drive and the strength calculation of the tension device. The required technical drawings are attached to the thesis.
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The screw conveyor of aggregate
Tocháček, Jakub ; Pokorný, Přemysl (referee) ; Kašpárek, Jaroslav (advisor)
This bachelor thesis deals with the conceptual design of horizontal screw conveyor for transportation of aggregate. The work consists of technical report and drawings. Technical report contains the calculation of main dimensions, selection of the drive, clutch and bearings, including stress analysis of functional parts. The drawings, which are based on model assembly processed in 3D CAD system, contains a drawing of the entire device, sub-assemblies of bearing seats and welding subassembly of trough.
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Portable Belt Conveyor for Construction Materials and Waste
Ostrý, Josef ; Malášek, Jiří (referee) ; Škopán, Miroslav (advisor)
The aim of this bachelor thesis is design of portable belt conveyor according to specified parameters. First part of the thesis contains the proposed concept with a choice of conveyor components. The next part of thesis deals with functional calculation, which is solved according to ČSN ISO 5040 and other specified sources. In the end of bachelor thesis is contained proposal of implemented tensioning device. Technical drawing of conveyor is also attached to the bachelor thesis.
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Inclined belt conveyor of aggregates
Švásta, Petr ; Jonák, Martin (referee) ; Škopán, Miroslav (advisor)
The aim of this work is the proposal inclined conveyor belt for transporting the aggregate maximum grain size up to 150mm. Functionalcalculation is made according to ISO 5048 Belt conveyor supportingrollers. The report contains a brief description of the function, use anddesign of the conveyor and its affiliates. On the basis of specifieddimensions is processed transporter function calculation, a simplifieddesign and conveyor tensioning devices. The work is accompanied bydrawings stretching equipment and conveyor assemblies.
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Portable conveyor for aggregate
Šarman, Michal ; Kašpárek, Jaroslav (referee) ; Škopán, Miroslav (advisor)
The aim of this bachelor thesis is to design portable belt conveyor for aggregate of given parameters. The introduction contains classification of conveying machines and devices. Further chapters are dealing with the actual design of the conveyor, functional description of individual parts, selection of components, and functional calculation according to ISO 5048 standard. The final chapter specifies maximum weight delivery and overall review of the machine. The work is suplemented by mechanical drawings.
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Worm conveyor of fine aggregate
Vosika, Jan ; Malášek, Jiří (referee) ; Škopán, Miroslav (advisor)
The main aim of the thesis was to design a horizontal worm-conveyor for the transport of fine aggregate of maximum aggregate gradation of 45 mm, both in terms of construction and strength. The design section of the thesis deals with the problem of an appropriate conveyor driving gear and skidding clutch between the gear and the transport unit according to the amount of transported aggregate. In the computation section, strength check of the drive system is addressed, namely the shaft check, its coupling with the other parts, and the bearing housing. In the last section, the structural design is addressed with respect to safety of operation and ease of maintenance.
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