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Aplikace optovláknových měřících systémů v materiálovém inženýrství a monitorování konstrukcí, Application of Fibre Optic Gauge Sensors in Material Engineering and Structure Monitoring
; Vedoucí práce: Vokáč Miroslav (České vysoké učení technické v Praze. Vypočetní a informační centrum., 2013-03-08)
Změny vlastností hydraulických vápenných pojiv vlivem zrychleného stárnutí, Changes in the Properties of Hydraulic Lime Binders due to Accelerated Aging
; Vedoucí práce: Vokáč Miroslav; Oponent práce: Rovnaníková Pavla (České vysoké učení technické v Praze. Vypočetní a informační centrum.Czech Technical University in Prague. Computing and Information Centre., 2022-06-22)
rámci průzkumu před restaurátorským zásahem je tím značně ztíženo. Předložená disertační práce je souhrnem experimentálního výzkumu zaměřeného na sledování změn chemicko-mineralogických a fyzikálních vlastností vzorků vápenných malt po vystavení...
Lime (primarily hydraulic) binders undergo a transformation process in the long term when the mineralogical composition and the pore system change due to the action of atmospheric CO2 and moisture. The determination of the initial binder quality of the historic mortar carried out within the survey before the restoration intervention is thus considerably more difficult. The presented dissertation summarizes experimental research aimed at monitoring changes in chemical-mineralogical and physical properties of lime mortar samples after exposure to accelerated aging. The theoretical part presents a research summary of the state of identification of historical lime binders. In the experimental part of the work, a set of six mortars with binders of different quality was tested in three modes of accelerated aging, including various concentrations of carbon dioxide and the effect of the presence of liquid water. After 30 and 180 days, the influence of individual regimes on mineralogical composition (TGA / MS, XRD, NMR, Raman spectroscopy), porous system (MIP, N2 physisorption), mechanical strength, and microstructure (SEM/EDS) was evaluated....
Lime (primarily hydraulic) binders undergo a transformation process in the long term when the mineralogical composition and the pore system change due to the action of atmospheric CO2 and moisture. The determination of the initial binder quality of the historic mortar carried out within the survey before the restoration intervention is thus considerably more difficult. The presented dissertation summarizes experimental research aimed at monitoring changes in chemical-mineralogical and physical properties of lime mortar samples after exposure to accelerated aging. The theoretical part presents a research summary of the state of identification of historical lime binders. In the experimental part of the work, a set of six mortars with binders of different quality was tested in three modes of accelerated aging, including various concentrations of carbon dioxide and the effect of the presence of liquid water. After 30 and 180 days, the influence of individual regimes on mineralogical composition (TGA / MS, XRD, NMR, Raman spectroscopy), porous system (MIP, N2 physisorption), mechanical strength, and microstructure (SEM/EDS) was evaluated....
EXPERIMENTÁLNÍ OVĚŘOVÁNÍ PRVKŮ Z TEXTILNÍHO BETONU, EXPERIMENTAL VERIFICATION OF TEXTILE REINFORCED CONCRETE (TRC) ELEMENTS
; Vedoucí práce: Vokáč Miroslav; Oponent práce: Podolka Luboš (České vysoké učení technické v Praze. Vypočetní a informační centrum.Czech Technical University in Prague. Computing and Information Centre., 2019-06-08)
normativních předpisů, kterými by se produkce prvků či konstrukcí TRC řídila. Disertační práce popisuje TRC kompozit z pohledu jeho dílčích složek, tj. vlastností jako je pevnost v tlaku, tahu, tahu za ohybu, modulu pružnosti, odolnosti vůči agresivnímu...
Textile Reinforced Concrete is a relative new, very attractive and especially highly loadbearing cement-based composite material revealed in the last decade. It is consisted of two main components. The components are mainly the previous mentioned cement composite often of the kind of ultra-high performance concrete (always fine-grained concrete with Dmax ≤ 4 mm) and a textile reinforcement (glass, carbon, basalt etc.) that is sometimes also called a non-conventional reinforcement. The result of the joining of these two components is a material that provides high compressive and bending strength, ductility, tensile strength, absorbs a big amount of energy and is enormously resistant to aggressive and degradation impacts of the environment even in the case of very thin and subtile products. With regard to the possibilities of the production of textiles that enables to wave also geometrically complicated woven fabrics (2D or 3D) and the properties of the concrete matrix, it is possible to manufacture various elements, even of unusual or complex shapes. However, there is no set of standards managing the production of elements or structures made from TRC in these days. The dissertation thesis describes a TRC composite from the point of view of its partial components, it means properties such as compressive strenght, tensile strenght, tensile strenght in bending, modulus of elasticity, resistence to aggressive environment but also from the point of view of technological, manufactural and utility properties....
Textile Reinforced Concrete is a relative new, very attractive and especially highly loadbearing cement-based composite material revealed in the last decade. It is consisted of two main components. The components are mainly the previous mentioned cement composite often of the kind of ultra-high performance concrete (always fine-grained concrete with Dmax ≤ 4 mm) and a textile reinforcement (glass, carbon, basalt etc.) that is sometimes also called a non-conventional reinforcement. The result of the joining of these two components is a material that provides high compressive and bending strength, ductility, tensile strength, absorbs a big amount of energy and is enormously resistant to aggressive and degradation impacts of the environment even in the case of very thin and subtile products. With regard to the possibilities of the production of textiles that enables to wave also geometrically complicated woven fabrics (2D or 3D) and the properties of the concrete matrix, it is possible to manufacture various elements, even of unusual or complex shapes. However, there is no set of standards managing the production of elements or structures made from TRC in these days. The dissertation thesis describes a TRC composite from the point of view of its partial components, it means properties such as compressive strenght, tensile strenght, tensile strenght in bending, modulus of elasticity, resistence to aggressive environment but also from the point of view of technological, manufactural and utility properties....