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	Removal of degraded layer of concrete with an emphasis on optimizing surface before applying repair materials Janurová, E. ; Pustelník, J. ; Mádr, V. ; Hlaváč, L. ; Bodnárová, L. ; Foldyna, Josef ; Hela, R. ; Sitek, Libor The topic of the work is modelling of the process of disintegration of degraded layer of construction materials by high-speed water jet during their preparation for repair action. Destructive action of high-speed water jet on concretes of various qualities and corrosion damage degree was studied both experimentally and theoretically. The result of the submitted work is determination of methodology of classification degraded and treated concrete surface. Detailed record
	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. Detailed record
	Determination of the surface topography after the maintenance by the high-velocity water jet tool using the digital photography technique Janurová, E. ; Pustelník, J. ; Sitek, Libor ; Mádr, V. ; Hela, R. ; Hlaváč, L. M. ; Bodnárová, L. The topic of the contribution is to study surfaces of degraded materials after repair preparation performed by high-velocity water jet, especially the pulsing one. There were set up the optimal parameters for recording and evaluation of surfaces before the application of repair materials in civil engineering on model materials with artificially prepared corroded layers. Destructive action of high-velocity water jet on concretes of various qualities and corrosion damage degree were studied both experimentally and theoretically. Detailed record

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