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National Repository of Grey Literature

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	Research on effects of pulsating water jets on concrete Sitek, Libor ; Bodnárová, L. An article briefly presents results achieved during laboratory and in-situ tests of removing surface layers of concrete exposed to various environments using several types of high-velocity water jets commonly used in the rehabilitation praxis or advanced water jets the use of which is expected in the near future. The effects of pulsating jets were always compared with classical continuous jets under identical or similar working conditions. Fulltext: content.csg - DOC Plný tet: UGN_0398582 - DOC Detailed record
	Study of behavior of concrete and cement based composite materials exposed to high temperatures Bodnárová, L. ; Horák, D. ; Válek, J. ; Hela, R. ; Sitek, Libor The paper describes possibilities of observation of behaviour of concrete and cement based composite material exposed to high temperatures. Nowadays, for large-scale tests of behaviour of concrete exposed to high temperatures, testing devices of certified fire testing stations in the Czech Republic and surrounding states are used. These tests are quite expensive. For experimental verification of smaller test specimens, a testing device was built at the Technical University in Brno, where tests of thermal loading of concrete tests specimens of various sizes can be carried out (dimensions up to 800 x 800 x 800 mm or slabs up to 1100 mm of length). The testing device opens new ways of observation of behaviour of concrete and cement based composite materials exposed to high temperatures as well as preparation of specimens for observation of interaction of water jet and concrete degraded by action of high temperatures. Fulltext: content.csg - DOC Plný tet: UGN_0398264 - DOC Detailed record
	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 Detailed record
	High strength composite elements of the profiles with fiber reinforcement and polymer matrix composites and concrete Bodnárová, L. ; Hela, R. ; Macháňová, P. ; Válek, J. ; Lukáš, J. ; Sitek, Libor Fibre composite materials with polymeric matrix - FRP (fiber reinforced polymer) are used mainly in the construction industry for special applications, alone or in conjunction with concrete. FRP composite systems are frequently used for various structures in aggressive environments and for high-strength composite carrier systems (in conjunction with concrete). Durability of FRP composites is determined by the composition of the composite material - determining the characteristics of the polymer matrix, the properties of the reinforcing fibers and the method of manufacturing the composite. Fulltext: content.csg - PDF Plný tet: UGN_0383916 - PDF Detailed record
	Use of new knowledge when removing concrete structures by high-speed water jets Sitek, Libor ; Bodnárová, L. ; Foldyna, Josef ; Klich, Jiří The article deals with the application of new knowledge and trends in the generation of high-speed water jets and their utilisation during repair of concrete structures not only in laboratory conditions but also for practical use in-situ. Contribution examines several types of water jets with emphasis on reduction of economical intensity of the process of repair and treatment of rehabilitated surface for subsequent application of repair materials. Fulltext: content.csg - PDF Plný tet: Sitek_Sanace2012 - PDF Detailed record

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