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New possibilities in the area of using of water jet technology for the removal of concrete surface layers
Bodnárová, L. ; Hela, R. ; Foldyna, Josef ; Sitek, Libor
The contribution deals with problems of using of water jet technology for the removal of concrete surface layers. Realized experimental tests were focused on the possibility of using of water jet technology in the stage of concrete surface preparation for the repair of concrete structures. The contribution specifies some new possibilities in the use of water jet technology for the concrete disintegration. The circumstances of surface layers removal through various types of water jet were investigated on concrete samples with different characteristics of surface layers. In the paper, possibilities of high-speed water jet technology are extended to the application of so-called flat water jet. Interesting results in relatively low energy demands can be achieved during disintegration of very hard concrete in conjunction with an acoustic pulse generator.
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Comparison of Continuous High-Pressure Generated and Pulsing Low-Pressure Generated Water Jets on Concrete
Mádr, V. ; Sitek, Libor ; Hela, R. ; Hlaváč, L. M. ; Bodnárová, L. ; Pustelník, J. ; Janurová, E.
The concrete samples with various erosion states were disintegrated by pure continuous water jets generated from pressure 380 MPa in the Liquid jet laboratory at the VŠB - Technical University of Ostrava. Simultaneously, the identical concrete samples were tested by pulsing water jets generated by low pressure 30 MPa in the Department of Material Disintegration at the Institute of Geonics of the AS CR. The erosion states of samples were prepared by application of several laboratory techniques simulating the concrete aging under the natural conditions due to the real applications in practice. They were prepared at the 127 Institute of Technology of Building Materials and Components of the Brno University of Technology. The influence of the erosion state on the disintegration rate was tested and the surface topography was studied. The comparison of both the depth of penetration and the volume disintegration ratio regarding the input power is performed.
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