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National Repository of Grey Literature 2 records found  Search took 0.00 seconds. 
Effect of thermal treatment on mechanical behaviour of Černý vrch bentonite
 Slezáková, Pavlína ; Najser, Jan (advisor) ; Hausmannová, Lucie (referee)
The storage of highly radioactive waste from nuclear power plants is currently planned to be solved in the Czech Republic by the construction of a deep repository with a multibarrier concept. The key component of one of the barriers is bentonite, whose sealing properties will help to ensure optimal conditions for the disposal of radioactive waste. The focus of the thesis is on a review of the knowledge on the mechanical properties of bentonite and their change after exposure to high temperatures. The review is complemented by the current knowledge of the czech bentonite BCV from the Černý Vrch locality, which is also the material for the laboratory measurements carried out in this thesis. The key part of the work consists of laboratory tests, necessary for experimental verification of the discussed bentonite properties. Internally developed multipurpose cells (MPC cells) were used for the majority of the laboratory tests, as the standard equipment of soil mechanics laboratories has relatively little application for bentonite barrier research. The aim of the experimental part was to investigate how the swelling capacity and hydraulic conductivity of the material change due to previous thermal loading. The main objective of the work is to obtain an overview of the behaviour of the Czech Ca-Mg...
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Investigation of the thermo-hydro-mechanical behavior of Czech bentonite used as a model material for planning of high level nuclear waste disposal
 Sun, Haiquan ; Mašín, David (advisor) ; Hausmannová, Lucie (referee) ; Havlová, Václava (referee)
The work involved in the thesis is mainly focused on the Czech bentonite which is originally from Cerny vrch deposit (north western region of the Czech Republic). The compacted bentonites are prepared from the industry provided bentonite powder with an initial water content around 10%. Dry densities from 1.27 to 2 g/cm3 were used for laboratory testing, specifically 1.27, 1.60 and 1.90 g/cm3 were used for water retention measurements, microstructures and fractal pore analysis. Dry densities of 1.25 to 1.95 g/cm3 were used for mechanical tests such as one dimensional swelling strain and oedometer load-unload tests. The vapor equilibrium method was used to impose the suction on samples ranging from 3.29 MPa to 286.7 MPa. Mercury intrusion porosimetry (MIP) and environmental scanning electron microscope (ESEM) were utilized for the microstructure analysis. The water retention measurements were performed at 20, 40, 60 and 80 řC respectively, results show that the increasing of temperature can decrease the water retention capacity. The influence of compaction and suction on microstructure was compared and studied. MIP tests were performed on the samples which were equilibrated at suction of 3.29, 38 and 286.7 MPa on wetting path of both low and high dry densities. The samples equilibrated at suction of...
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