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The application of high-speed water jet in civil engineering
Hudský, Petr ; Hela,, Rudolf (referee) ; Bodnárová, Lenka (advisor)
Bachelor thesis is focused on gathering available information about the use high-speed water jet in civil engineering The thesis describes types of water jets, used in industry, focusing in detail on the use in construction. Mentioned are also selected tools for rehabilitation. Was studied experimentally the influence of pressure water jets for various types of concrete, cutting depth, strength and pull-off test with the evaluation and comparison.
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Diagnostic properties of concrete exposed to high temperatures
Hudský, Petr ; Sitek,, Libor (referee) ; Bodnárová, Lenka (advisor)
This master’s thesis studies the problems of high temperatures on cement concretes, their following diagnostics from pre-treatment to rehabilitation, the emphasis was on the use of high-speed water jet. In the experimental part of the design of a concrete composition with basalt aggregate. Were reviewed the physico-mechanical properties after thermal loading. The influence of pressure water jet on the thermal load on concrete, pull-off test, the volume of the removed concrete with a strength evaluation and comparison.
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Study the concrete abrasion process by water
Boucníková, Veronika ; Hela, Rudolf (referee) ; Bodnárová, Lenka (advisor)
The master thesis is focused on resistance of concrete against to effects of flowing water. In the theoretical part of the thesis mechanical and chemical effects of flowing water were described. The research of aspects that affects resistance of concrete against flowing water was done. Futhermore, the methods that evaluated resistance of concrete against flowing water were described. In the experimental part of the thesis the effect of concrete composition on resistance against mechanical and water abrasion was observed. Abrasive and plain high-speed water jet was used to simulate the effects of water abrasion. After interaction of concrete and water jet the relief and volume loss of material were observed.
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Diagnostic properties of concrete exposed to high temperatures
Hudský, Petr ; Sitek,, Libor (referee) ; Bodnárová, Lenka (advisor)
This master’s thesis studies the problems of high temperatures on cement concretes, their following diagnostics from pre-treatment to rehabilitation, the emphasis was on the use of high-speed water jet. In the experimental part of the design of a concrete composition with basalt aggregate. Were reviewed the physico-mechanical properties after thermal loading. The influence of pressure water jet on the thermal load on concrete, pull-off test, the volume of the removed concrete with a strength evaluation and comparison.
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Possibilities of rehabilitation of concrete structures damaged by high temperaturesv
Vovesný, Václav ; Sitek,, Libor (referee) ; Bodnárová, Lenka (advisor)
The bachelor thesis studies the behavior of the cement concrete exposed to high temperatures. The theoretical part describes the processes in the concrete structure and its individual components. It also describes the diagnostic possibilities of the concrete and its subsequent rehabilitation. In case of rehabilitation and surface pretreatment possibilities, the emphasis was mainly placed on the high-speed water jet. Physical-mechanical properties of the samples were verified by heavy load of pressure from high-speed water jet and high temperature in the experimental part.
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The application of high-speed water jet in civil engineering
Hudský, Petr ; Hela,, Rudolf (referee) ; Bodnárová, Lenka (advisor)
Bachelor thesis is focused on gathering available information about the use high-speed water jet in civil engineering The thesis describes types of water jets, used in industry, focusing in detail on the use in construction. Mentioned are also selected tools for rehabilitation. Was studied experimentally the influence of pressure water jets for various types of concrete, cutting depth, strength and pull-off test with the evaluation and comparison.
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Effects of water jet on heat-affected concretes - laboratory tests
Klich, Jiří ; Sitek, Libor ; Zeleňák, Michal ; Hlaváček, Petr ; Foldyna, Josef ; Bodnárová, L. ; Válek, J.
The paper is dealing with the effects of flat high-speed water jet on concretes affected by high temperature. Research should help to correct use of water jet technology in repair works on concrete structures especially after wildfires in tunnels, underground garages, etc., which are exposed to enormous thermal stress.
Fulltext: content.csg -  PDF
Plný tet: UGN_0392712 - PDF
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Testing of Nozzles
Foldyna, Josef ; Sitek, Libor ; Ščučka, Jiří ; Klich, Jiří ; Hlaváček, Petr
Based on the request made by the company NET Ltd. Staré Město pod Sněžníkem, tests of quality of nozzles for generation of high-speed water jet were performed at the Department of material disintegration of the Institute of Geonics AS CR, v. v. i., in Ostrava. Three nozzles provided by NET were tested. The nozzles were marked as nozzle CKM – A, nozzle CKM – B, and nozzle ACMK. The nozzle quality was evaluated by the determination of their discharge coefficient at various operating pressures and by visual inspection of the quality of the nozzle and the water jet.
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