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Microscopic characterization of mortar samples from Vinohrady Railway Tunnels
Bauerová, Pavla; Frankeová, Dita; Slížková, Zuzana
2021 - Czech
Within the construction-technical survey framework, a microscopic analysis of historical concrete samples was performed using a scanning electron microscope and SEM-EDS analysis. Characterization of mortar components and identification of chemical corrosion products. The results of the survey work were used as a basis for the reconstruction project. V rámci stavebně-technického průzkumu byl proveden mikroskopický rozbor vzorků historického betonu s využitím skenovacího elektronového mikroskopu a SEM‐EDS analýzy. Byla provedena charakterizace plniva a složek pojiva malt a identifikace produktů chemické koroze. Výsledky průzkumných prací byly použity jako podklad pro návrh rekonstrukce objektu.\n
Keywords:
Portland cement; tunnel; degradation
Available at various institutes of the ASCR
Microscopic characterization of mortar samples from Vinohrady Railway Tunnels
Within the construction-technical survey framework, a microscopic analysis of historical concrete samples was performed using a scanning electron microscope and SEM-EDS analysis. Characterization of ...
Numerical study of the air flow around the U-profile
Ledvinková, Blanka; Hračov, Stanislav; Macháček, Michael
2021 - English
Our contribution deals with the numerical simulations of the air flow around u-profiles at various angles of attack with the aim to investigate their proneness to galloping. The Unsteady Reynolds Averaged Navier- Stokes (RANS) simulations were performed in the COMSOL Multiphysics software, k-ω SST turbulence model was used. The values of the aerodynamic coefficients and Strouhal number were evaluated and the results were compared with the results obtained experimentally in the wind tunnel.
Keywords:
bluff-body aerodynamics; URANS simulation; transversal galloping
Available at various institutes of the ASCR
Numerical study of the air flow around the U-profile
Our contribution deals with the numerical simulations of the air flow around u-profiles at various angles of attack with the aim to investigate their proneness to galloping. The Unsteady Reynolds ...
Methodology of the measuring of projectile velocity degradation in the ballistic resistant materials
Šperl, Martin; Bejdl, Jan; Wolf, Benjamin; Koutný, O.; Kratochvíl, J.; Bystrianska, E.; Křesťan, J.; Bartošková, M.; Holešinský, R.; Drdlová, M.; Šoukal, F.; Pěchouček, P.
2021 - Czech
The methodology report describe a complete methodology for measuring the decrease of projectile speed in ballistic resistant material, incl. description of the required measuring systems. V práci je vypracována kompletní metodika k měření útlumu rychlosti projektilu v balisticky odolném materiálu vč. popisu potřebných měřících zařízení.
Keywords:
ballistic materials; velocity degradation; concrete; high speed measuring
Available at various institutes of the ASCR
Methodology of the measuring of projectile velocity degradation in the ballistic resistant materials
The methodology report describe a complete methodology for measuring the decrease of projectile speed in ballistic resistant material, incl. description of the required measuring systems.
Ceiling plaster in the Church of Master Jan Hus in Česká Lípa. Plaster in the Stauss system
Válek, Jan; Skružná, Olga; Kozlovcev, Petr; Slížková, Zuzana; Frankeová, Dita; Kotková, Kristýna; Viani, Alberto
2021 - Czech
The studied ceiling plasters were sampled the Mistr Jan Hus Church in Česká Lípa. The material consisted of several layers of paint. The aim of this research was to characterize the individual layers of plaster in the Stauss system. Vzorky pochází z omítky stropní konstrukce kostela Mistra Jana Husa v České Lípě. Omítka se skládá z několika vrstev a nátěrů. Cílem průzkumu je charakterizovat vrstvy tvořící základ omítkového souvrství, které bylo použito ve spojení se stropním systém Stauss.
Keywords:
ceiling plaster; material composition; plaster characterization; Stauss system; Mistr Jan Hus Church Česká Lípa
Available at various institutes of the ASCR
Ceiling plaster in the Church of Master Jan Hus in Česká Lípa. Plaster in the Stauss system
The studied ceiling plasters were sampled the Mistr Jan Hus Church in Česká Lípa. The material consisted of several layers of paint. The aim of this research was to characterize the individual layers ...
Chemical and mineralogical analysis of a mortar sampled from the well in the yard of the object Sedláčkova 15, Pilsen.
Frankeová, Dita; Bauerová, Pavla; Slížková, Zuzana
2021 - Czech
The mortar sample was analyzed using a TGA and SEM-EDS analysis as part of the construction and technical survey. The mortars' aggregate and binder components were analyzed, and the binder was identified as a mixture of soil and lime. Rozbor vzorků historické malty s využitím skenovacího elektronového mikroskopu (SEM‐EDS) a termické analýzy (TGA) analýzy. Charakterizace plniva a složek pojiva malty. Pojivo malty je nehomogenní, tvoří ho především hlinitokřemičitanová zemina (jíly) a vápno.
Keywords:
mortar; SEM‐EDS; TGA
Available at various institutes of the ASCR
Chemical and mineralogical analysis of a mortar sampled from the well in the yard of the object Sedláčkova 15, Pilsen.
The mortar sample was analyzed using a TGA and SEM-EDS analysis as part of the construction and technical survey. The mortars' aggregate and binder components were analyzed, and the binder was ...
High resolution region of interest X-Ray tomography
Kumpová, Ivana; Vopálenský, Michal
2021 - Czech
The method of X-ray micro-tomography is increasingly used in the research of material characteristics and fracture behavior of building materials. It brings promising results in the field of three-dimensional observation and quantification of microstructure elements, including fracture objects. However, with the standard approach to the tomographic data acquisition, the achievable resolution is severely limited by the size of the examined object resulting in a reduction or even complete loss of useful information regarding, for example, the shape and size of the fracture process zone. For this reason, the possibilities of tomographic targetting of the region of interest with a higher achievable resolution than the usual limit of the tomographic systems have been tested in this work. Metoda rentgenové mikro-tomografie je stále více využívána mimo jiné při výzkumu materiálových charakteristik a lomového chování stavebních materiálů. Poskytuje slibné výsledky v oblasti trojrozměrného pozorování a kvantifikace prvků mikrostruktury, včetně objektů lomu. Se standardním přístupem k získávání tomografických dat je však dosažitelné rozlišení výrazně omezeno velikostí zkoumaného objektu, což má za následek omezení nebo dokonce úplnou ztrátu užitečných informací týkajících se například tvaru a velikosti lomové procesní zóny. Z tohoto důvodu byly v této práci testovány možnosti tomografického cílení na zájmovou oblast s vyšším dosažitelným rozlišením, než je obvyklý limit tomografických systémů.
Keywords:
X-Ray micro-tomography; spatial resolution; contrast to noise ratio; denoising filtering; 3D volume fitting
Fulltext is available at external website.
High resolution region of interest X-Ray tomography
The method of X-ray micro-tomography is increasingly used in the research of material characteristics and fracture behavior of building materials. It brings promising results in the field of ...
Chemical and microstructural characterization of building materials sampled from Kamenička waterwork
Frankeová, Dita; Bauerová, Pavla; Koudelková, Veronika; Slížková, Zuzana
2021 - Czech
Within the construction-technical survey framework, a microscopic analysis of historical concrete samples was performed using a scanning electron microscope and SEM-EDS analysis. Characterization of mortar components, determination of concrete degradation degree, and identification of chemical corrosion products. The results of the survey work were used as a basis for the reconstruction project.\n V rámci stavebně-technického průzkumu byl proveden mikroskopický rozbor vzorků historického betonu s využitím skenovacího elektronového mikroskopu a SEM‐EDS analýzy. Byla provedena charakterizace plniva a složek pojiva malt, určení stupně degradace betonu a identifikace produktů chemické koroze. Výsledky průzkumných prací byly použity jako podklad pro návrh rekonstrukce objektu.\n
Keywords:
material characterization; mortars; concrete
Available at various institutes of the ASCR
Chemical and microstructural characterization of building materials sampled from Kamenička waterwork
Within the construction-technical survey framework, a microscopic analysis of historical concrete samples was performed using a scanning electron microscope and SEM-EDS analysis. Characterization of ...
Characterization of 'brizolit' plasters from Zlín (CR) based on SEM-EDS microscopic analysis
Bauerová, Pavla; Frankeová, Dita; Slížková, Zuzana
2021 - Czech
Composition of the binder and the aggregate components in “Brizolit” plaster using SEM-EDS method. Plaster was sampled from the building façade in Zlín (CR). Výsledky analýzy složení plniva a pojiva metodou SEM-EDS v omítce zvané brizolit odebrané z fasády domu ve Zlíně.
Keywords:
brizolit; SEM-EDS; historic plaster; Portland cement; lime; mortar characterization
Available at various institutes of the ASCR
Characterization of 'brizolit' plasters from Zlín (CR) based on SEM-EDS microscopic analysis
Composition of the binder and the aggregate components in “Brizolit” plaster using SEM-EDS method. Plaster was sampled from the building façade in Zlín (CR).
Mechanical and fracture mechanical analysis of steel segments cut from Družba oil pipelines DN 500 and DN 700
Gajdoš, Lubomír; Šperl, Martin; Šorm, Filip; Bejdl, Jan
2021 - Czech
Experimental research of mechanical and fracture mechanical properties of the pipe specimens taken from Družba oil pipeline. In addition to basic static tests and fracture toughness tests, the research also included the determination of the kinetic of fatigue crack growth, incl. analysis of critical crack size. Experimentální výzkum mechanických a lomově-mechanických vlastností trubních vzorků z ropovodu Družba. Kromě základních statických zkoušek a zkoušek na určení lomové houževnatosti bylo součástí výzkumu i určení kinetiky růstu únavových trhlin vč. analýzy kritické velikosti trhlin.
Keywords:
J integral; pipeline; toughness; crack
Available at various institutes of the ASCR
Mechanical and fracture mechanical analysis of steel segments cut from Družba oil pipelines DN 500 and DN 700
Experimental research of mechanical and fracture mechanical properties of the pipe specimens taken from Družba oil pipeline. In addition to basic static tests and fracture toughness tests, the ...
Microscopic analysis of the mortar sampled from the fortress 'Stary Dvur', Krupka (CZ)
Bauerová, Pavla; Frankeová, Dita; Slížková, Zuzana
2021 - Czech
Chemical and mineralogical composition of the binder and the aggregate of mortar, using electron microscopy and SEM-EDS analysis Chemické a mineralogické složení pojiva a plniva malty pomocí elektronové mikroskopie a SEM-EDS analýzy
Keywords:
SEM-EDS analysis; historic mortar; hydraulic lime; decalcification; carbonatization
Available at various institutes of the ASCR
Microscopic analysis of the mortar sampled from the fortress 'Stary Dvur', Krupka (CZ)
Chemical and mineralogical composition of the binder and the aggregate of mortar, using electron microscopy and SEM-EDS analysis
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