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National Repository of Grey Literature

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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. 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
	Research on rock disintegration by cutting tools, roller bits and water jet. Proceedings Sitek, Libor Proceeding contain papers presented at international colloquium Research on rock disintegration by cutting tools, roller bits and water jet. Detailed record
	Twenty five years of high pressure water jet research in ÚGN (IoG) Vašek, Jaroslav Water jet research of Institute of Geonics, principal water jet parameters evaluation, international cooperation. Detailed record
	Numerical model of acoustic generator for pulsating water jet generation Foldyna, Josef ; Říha, Zdeněk ; Sitek, Libor Simulation of 3D, unsteady, turbulent flow of compressible water and non-compressible air in the high-pressure system equipped with acoustic generator of pressure pulsations. The objective was to simulate processes of generation and propagation of pressure pulsation in the system and subsequent formation of pulsating water jet in the air. Detailed record
	Water jet application in rocks extraction and processing Vašek, Jaroslav Water jet application in extraction and processing of non-ferrous deposites. Detailed record
	Disintegration of concrete and rocks by modulated water jet: laboratory experiments Sitek, Libor ; Foldyna, Josef ; Ščučka, Jiří Problem of preparation of concrete and rock surfaces before repair using modulated water jet is a subject of the paper. Selected results of laboratory tests of disintegration of various types of concrete as well as rocks are presented and compared with results of concrete and rock disintegration by means of continuous water jet under the same operating conditions. Detailed record
	Utilisation of modulated water jets for cleaning and removal of surface layers Sitek, Libor ; Foldyna, Josef ; Nováková, Daria A problem of cleaning and removing of surface layers is a subject of the paper. The review of traditional cleaning methods is accompanied with section dealing with cleaning by high speed water jets, and, in particular, by ultrasonic modulated jets. Advantage of using such the jets are presented from booth economical and ecological points of view. Detailed record
	Modulated vs. continuous jets: Performance comparison Foldyna, Josef ; Sitek, Libor Performance of ultrasonically modulated jets in cutting of various materials was tested in laboratory conditions in the Institute of Geonics in Ostrava. Results obtained in cutting of brass, mild steel, rock and concrete samples using modulated water jets are presented. The results are compared with those obtained with continuous jets at the same operating parameters. Potential of forced modulation of the jet is discussed. Detailed record
	Measurement of force effects of modulated jet Foldyna, Josef ; Sitek, Libor ; Jekl, Pavel ; Nováková, Daria Results obtained in measurement of force effects of water jets modulated by ultrasonic vibration of a tip situated inside the nozzle are presented. Both method of modulation of the jet and method of measurement of force effects of the jet are briefly described. Potential of the measurement of force of modulated jets in determination of optimum configuration of the ultrasonic nozzle is discussed. Detailed record

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