National Repository of Grey Literature 91 records found  1 - 10nextend  jump to record: Search took 0.00 seconds. 
Study of properties of cement composites with addition of polymer fibers
Dokoupil, Tomáš ; Hela, Rudolf (referee) ; Bodnárová, Lenka (advisor)
The bachelor thesis deals with the use of polymer fibers in cement matrix. It describes the distribution and production of the most commonly used polymer fibers as well as the requirements for their properties. A comparison of the properties of different types of polymer fibers is given. The work presents the individual components of the fiber concrete matrix, its production, testing of fresh and hardened fiber concrete and specific examples of its use in practice. Using professional research, the influence of PP, PE and PVA fibers on the properties of fresh and hardened concrete is described in detail. New trends in the use of polymer fibers are also presented. At the end of the work, a procedure of experimental verification of the properties of fiber-reinforced concrete in comparison with a reference sample of plain concrete is proposed.
FRP for concrete reinforcement
Blahová, Aneta ; Vaněrek, Jan (referee) ; Bodnárová, Lenka (advisor)
The bachelor thesis deals with composite polymer FRP reinforcement. It descibes the method of manufacturing FRP reinforcements, which are their properties and what materials are used by manufacturers. Lists FRP reinforcement application in various structures. Also mentions the durability of FRP reinforcement in an aggressive environment and the cohesiveness of FRP reinforcement with concrete. The conclusion of the work is a proposal for experimental testing of a bond between FRP reinforcement and concrete.
Development of abrasion-resistant concrete and testing methods
Procházka, David ; Bodnárová, Lenka (referee) ; Hela, Rudolf (advisor)
This diploma thesis deals with concrete abrasion resistance against abrasion. The constructions of transport and water management structures are most stressed by the action of abrasion by means of travel of vehicles and flowing water. Abrasion reduces the durability of the structures. The prerequisites for achieving the best possible abrasion resistance are examined. Furthermore, test methods that are currently used worldwide. The experimental part deals with the influence of individual types of aggregates amphibolite (Želešice), fecal gravel sand (Žabčice) and basalt (Bílčice) on abrasion resistance. Furthermore, the dependence between the strength of the concrete and the hardness of the surface for abrasion resistance. Abrasion resistance testing was determined by concrete abrasion, abrasion resistance by the Böhm method and by water jet.
Hlaváček, Petr ; Sitek, Libor ; Klichová, Dagmar ; Bodnárová, L.
The paper deals with the use of the abrasive water flow technology in an accelerated simulation of the process of mechanical degradation of surface layers of cement-based composites by flowing liquids. Effects of the abrasive particle size and the mass flow rate of abrasives in an abrasive water flow impacting on the surface of concrete samples have been studied. In addition, suitability of the application of the abrasive water flow for the simulation of real situation of the surface wear by flowing liquids has been evaluated.
Cement Composite for 3D Printing Technology
Lipoldová, Marie ; Hela, Rudolf (referee) ; Bodnárová, Lenka (advisor)
3D printing technology represents a fast-growing industry within many industrial sectors. This bachelor thesis is focused on possibilities of using 3D printing technology in building industry. In the theoretical part there are stated typical technologies and realizations of 3D printing in the field of construction. The thesis also includes a research which is essential for the determination of requirements for cement composites for 3D printing technologies including tests for verification of their properties. The experimental part of the bachelor thesis is focused on testing of various recipes of cementitious composites, especially on the properties of both fresh and hardened composites. Two batches were tested for the suitability of utilisation of waste PET particles.
The effect of appication of fine organic fibers to cement composites
Kavka, Lukáš ; Hela, Rudolf (referee) ; Bodnárová, Lenka (advisor)
This bachelor thesis describes the effect of using fine organic fibers in cement composites. In the theoretical part of bachelor thesis a composite material was defined and his individual components were described. Then was created a research of information about organic fibers focused on natural fibers. The basic parameters of cellulosic fibers and polypropylene fibers, the effect on the properties of cement composites and their application in practice were described. In the practical part there were created a reference concrete and 3 types of concrete with the addition of various types of organic fibers. The influence of fiber addition on the properties of fresh and hardened concrete were investigated. Another task of practical part was monitored the resistance of cellulose fibers in acidic and alkaline media in which the tested fibers were deposited. The development of pH solutions was examined over time.
The diploma thesis was prepared in cooperation with Atemit. The thesis describes the specific composition and properties of polymer industrial substrates from Atemit research.
Šácha, Dominik ; Tesařík, Miroslav (referee) ; Bodnárová, Lenka (advisor)
This diploma thesis has goal to find out possibility of substitution sand in polymer crete flooring system by recycling car glass. Polymer crete is made from sand and epoxy resin. Companies use it in industrial flooring system. Polymercrete industrial flooring systems are new types of floor surface. It aims to customers with high requirements to floor properties and short time of realisation. Polymercrete floors are 4-6 mm thin. They are waterproof, they has higher compressive strength then 60 MPa and tensile strength is more than 20 MPa. Polymercretes does not make dust. This study includes also suggestion of recycling process to make glass sand from car glass windows. The diploma thesis was prepared in cooperation with company Atemit, s.r.o.
Verification of properties of concretes with nanoparticles
Pacltová, Klára ; Hela, Rudolf (referee) ; Bodnárová, Lenka (advisor)
This diploma thesis deals with the influence of addition of carbon nanoparticles on cement composites. The theoretical part of the diploma thesis is focused on the research of information about carbon nanoparticles, more precisely about carbon nanotubes and graphene oxide. There are summarized methods of dispersing carbon nanotubes and their effects on cement composites. The practical part follows the theoretical part of the research. In the first phase, the correct technique of graphene oxide dispersion was verified. Subsequently, the effects of graphene oxide on the mechanical properties of cement mortars were verified. In the final phase of the diploma thesis, the knowledge gained from the previous part was verified on concrete samples.
Study of the influence of aggregate composition on volume changes and mechanical properties of High Performance Concrete
Vobinušková, Kristýna ; Hela, Rudolf (referee) ; Bodnárová, Lenka (advisor)
The master´s thesis deals with the volume changes of concrete during its concrete glow. These volume changes are generally more susceptible to high-strength concretes – HSC, which contain a bigger dose of binder. The theoretical section describes the possible reduction volume change especially in HSC, which are focused on the composition of concrete, especially on the type and particle size distribution of aggregate. Then attention is also paid to the different types of cements and their possible substitution. The part of the theoretical work describes the types of volume changes that may occur. In the experimental part are suggested the HSC by to secure informations. Different kinds of aggregates are used and a continuous or discontinuous grain curve and a different maximum grain size. Part of the sample was made only from CEM I 42,5 R and the second part of the sample from CEM I 42,5 R with the addition of very finely ground limestone. In terms of the part of the work were monitored volume changes of concrete with different composition and also their mechanical properties after 7, 28 and 90 days. Specifically, compressive strength, tensile strength, strength of the surface layers of concrete, water absorption and water-permeability test concrete. In conclusion, are listed all the results of tests.
Use of FRP Composites as Reinforcing Material for Concrete
Kratochvílová, Denisa ; Prokeš,, Jan (referee) ; Bodnárová, Lenka (advisor)
Because FRP composites have high fiber strength and good durability, they are increasingly used for repairs, modernisation and reconstruction of concrete structures. In practice, however there is a risk of premature separation of FRP reinforcement from concrete. This can be avoided by appropriate selecting the fibers and the matrix and the appropriate shape of the reinforcement. The actual materials and consistency of FRP reinforcement with concrete are also covered by this diploma thesis.

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6 Bodnárová, L.
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