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Analysis of the porosity of a plaster cast, based on tomography data. Pilot measurement for the feasibility verification of the method for analyses of cast sculptures
Kumpová, Ivana; Vopálenský, Michal
2020 - Czech
The aim of the tomographical research was the verification of the feasibility of the X-ray tomography for the qualitative description of the internal structure of the cast sculptures (damage, former restoration evidence etc.) and also for the characterization of the way and direction of the plaster pouring. There is a hypothesis that in the cast piece, the non-uniform distribution of pores as for the size (volume) along the vertical direction should be observable. The deeper in the piece, the higher amount of smaller pores and lower amount of bigger pores is expected. As well, lower porosity, i.e., ratio of the volume of the pores and the entire investigated volume, is expected deeper in the sample. The distribution of the pores could indicate, how the sculpture was made, in particular, where were the pouring holes and how many, what was the material flux like and how did it mixture. The method was verified on a specimen and the indicated hypotheses were only partly confirmed. Tomografický průzkum byl zaměřen na ověření metody založené na rentgenové tomografii pro kvalitativní popis vnitřní struktury litých soch (poškození, restaurátorské zásahy aj.), ale i pro zjištění způsobu a směru lití sádry/kamene. Existuje hypotéza, že v odlitku by mělo být pozorovatelné nerovnoměrné rozložení pórů co do velikosti (objemu) po jeho výšce. S hloubkou odlitku je očekávána zvyšující se četnost menších pórů a snižující se četnost větších pórů. Obdobně je se zvyšující se hloubkou očekávána nižší hodnota pórovitosti, tj. poměru objemu pórů k objemu vybrané oblasti. Znalost přesného rozložení pórů by tak mohla napovědět, jakým způsobem byla socha vylita, zejména v jaké poloze byla použitá forma při odlévání, kde byly licí otvory a v jakém počtu, jak proudila a mísila se litá hmota. Metoda byla ověřována na zkušebním vzorku a uvedené hypotézy se potvrdily jenom částečně.
Keywords:
X-ray computed tomography; cast sculptures; fine arts
Available at various institutes of the ASCR
Analysis of the porosity of a plaster cast, based on tomography data. Pilot measurement for the feasibility verification of the method for analyses of cast sculptures
The aim of the tomographical research was the verification of the feasibility of the X-ray tomography for the qualitative description of the internal structure of the cast sculptures (damage, former ...
Chemical and microstructural characterization of building materials sampled from Mšeno waterwork
Frankeová, Dita; Jurkovská, Lucie; Slížková, Zuzana
2020 - 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. 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.
Keywords:
waterwork; concrete; degradation
Available at various institutes of the ASCR
Chemical and microstructural characterization of building materials sampled from Mšeno 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 ...
Statics strength test of the steel pin with 65 kN force transducer
Šperl, Martin; Vála, Ondřej; Zíma, Pavel
2020 - Czech
Research report on testing the steel pin which was loading in the three point bending mode. The steel pin was fitted with a 65 kN force sensor and loaded to its strength limit. The pin is used as a safety component for the building lifts. Výzkumná zpráva o testování ocelového čepu, který byl zatěžován v režimu tříbodového ohybu. Ocelový čep byl vybaven senzorem síly 65 kN a byl zatížen až na hranici své pevnosti. Tento čep se používá jako bezpečnostní komponenta pro stavební výtahy.
Keywords:
steel pin; strength; three point bending
Available at various institutes of the ASCR
Statics strength test of the steel pin with 65 kN force transducer
Research report on testing the steel pin which was loading in the three point bending mode. The steel pin was fitted with a 65 kN force sensor and loaded to its strength limit. The pin is used as a ...
Scientific report. Tomography of an archaeological finding – a container with coins
Vopálenský, Michal; Kumpová, Ivana
2020 - Czech
The aim of the research is to visualize an archaeological finding of coins (mostly Ag/Cu alloy) in a ceramic container by means of the computed tomography. The artifact is dated to the first half of the 15th century, the visible coins are Prague Groschen and Vienna Pfennigs. The tomographical model should in an ideal case enable to identify the number and type of the coins and other possible materials. Besides of coins, the finding can contain wood, other organic materials (leather) and soil. The container is approx. 20 cm high, with the maximum diameter of approx. 15 cm. The weight of the artifact is 3.8 kg. Účelem výzkumu je výpočetní tomografií vizualizovat archeologický nález mincí (slitina převážně Ag a Cu) v keramické nádobě. Nález je datován zhruba do 1. pol. 15. stol., viditelné mince jsou pražské groše a vídeňské feniky. Tomografický model by v ideálním případě umožnil popsat počet a druh mincí a identifikovat případné další materiály. Kromě mincí může nález obsahovat dřevo, jiné organické materiály (kůže) a zeminu. Nádoba je zhruba 20 cm vysoká a má v nejširším místě průměr asi 15 cm. Hmotnost nálezu je 3,8 kg.
Keywords:
X-ray tomography; archaeology
Available at various institutes of the ASCR
Scientific report. Tomography of an archaeological finding – a container with coins
The aim of the research is to visualize an archaeological finding of coins (mostly Ag/Cu alloy) in a ceramic container by means of the computed tomography. The artifact is dated to the first half of ...
Scientific report. Large-area X-ray scan of a mosaic with high resolution
Vopálenský, Michal
2020 - Czech
The aim of the research is to make an X-ray scan of a mosaic, which thanks to a high resolution could reveal structural details in the mosaik construction, as armature, cracks etc. The investigated object as a mosaic of St. Family from the Liberec region. The size of the mosaic is 1200 x 700 x 30 mm and its weight is about 50 kg. The mosaic itself is mounted into a metal frame. The substrate of the tesserae is a cement-based material. Účelem výzkumu je provést rentgenové scanování mozaiky, které by díky vysokému rozlišení mohlo odhalit strukturální detaily ve skladbě mozaiky, jako jsou výztuže, trhliny a podobně. Jedná se o mozaiku Sv. Rodiny, pocházející z oblasti Liberecka. Rozměry mozaiky jsou 1200 x 700 x 30 mm a hmotnost kolem 50 kg. Vlastní objekt mozaiky je zasazen do kovového rámu či objímky. Podklad teser tvoří materiál na bázi cementu.
Keywords:
X-ray radiography; large-area scanning; mosaic
Available at various institutes of the ASCR
Scientific report. Large-area X-ray scan of a mosaic with high resolution
The aim of the research is to make an X-ray scan of a mosaic, which thanks to a high resolution could reveal structural details in the mosaik construction, as armature, cracks etc. The investigated ...
Monitoring of damage and failures in presentable hall of Fürstenberg Palace, Mala Strana, Prague
Drdácký, Miloš; Zíma, Pavel
2020 - Czech
The report describes and analyses damage and failure of historic structures and relates them to a long term monitoring of movement in cracks and temperature fluctuations. Zpráva popisuje a analyzuje poruchy historických konstrukcí a vztahuje je k dlouhodobému monitorování změn teploty a pohybu trhlin.
Keywords:
Fürstenberg Palace; historic structures; damage; cracks
Available at various institutes of the ASCR
Monitoring of damage and failures in presentable hall of Fürstenberg Palace, Mala Strana, Prague
The report describes and analyses damage and failure of historic structures and relates them to a long term monitoring of movement in cracks and temperature fluctuations.
Analysis of selected elements using ICP-OES
Ševčík, Radek
2020 - Czech
The research report summarizes the analysis of acid extracts measurements of copper artefacts. Concentrations of selected metals cations were determined using optical emission spectrometer with inductively coupled plasma. Výzkumná zpráva shrnuje výsledky analýz z měření kyselých výluhů měděných artefaktů. Koncentrace vybraných kationtů kovů byly stanoveny optickým emisním spektrometrem s indukčně vázanou plasmou.
Keywords:
elemental analysis; acid extracts; ICP-OES
Available at various institutes of the ASCR
Analysis of selected elements using ICP-OES
The research report summarizes the analysis of acid extracts measurements of copper artefacts. Concentrations of selected metals cations were determined using optical emission spectrometer with ...
Analysis of water soluble salts in bricks (Landštejn)
Ševčík, Radek
2020 - Czech
The research report presents the results of water extracts analysis of bricks originated form Landštejn castle. The determination of chlorides, nitrates and sulphates was performed using ion chromatography. Výzkumná zpráva přináší výsledky analýz vodních výluhů z cihel pocházejících z hradu Landštejn. Metodou iontové chromatografie byl stanoven obsah chloridů.
Keywords:
salts; bricks; ion chromatography
Available at various institutes of the ASCR
Analysis of water soluble salts in bricks (Landštejn)
The research report presents the results of water extracts analysis of bricks originated form Landštejn castle. The determination of chlorides, nitrates and sulphates was performed using ion ...
Analysis of stabilization of masonry walls on the Štamberk castle ruins
Drdácký, Miloš; Frankeová, Dita
2020 - Czech
Analysis involves study of typology of individual phases of medieval stone masonry, classification of its quality, description of its condition and identification of its damage and failures. It suggests safeguarding and protection of masonry ruins including their presentation. It presents results of basic material characterisation of lime mortars on the castle. Analýza zahrnuje studium typologie jednotlivých fází středověkého kamenného zdiva, klasifikaci jeho kvality, popis jeho stavu a identifikaci poruch. Zabývá se návrhem záchrany zděných torz, jejich ochrany a prezentace. Uvádí výsledky základního testování materiálových charakteristik vápenných malt užívaných na hradu.
Keywords:
stone masonry; failures; damages; ruins; safeguarding
Available at various institutes of the ASCR
Analysis of stabilization of masonry walls on the Štamberk castle ruins
Analysis involves study of typology of individual phases of medieval stone masonry, classification of its quality, description of its condition and identification of its damage and failures. It ...
Survey of mortars of the Romanesque chapel in the tower of Landštejn Castle
Válek, Jan; Skružná, Olga; Kozlovcev, Petr; Frankeová, Dita; Svoboda, Milan; Ševčík, Radek; Kotková, Kristýna
2020 - Czech
Four samples of floor mortars and two samples of plasters were analysed as a part of the survey in the Romanesque chapel located in the tower at Landštejn Castle. The aim was to characterize used raw materials, determine their ratio, characterize the porosity of mortars and compare mortars sorted to different phases of construction. V rámci průzkumu byly odebrány čtyři vzorky malt z podlahy a dva vzorky z omítek v prostoru románské kaple nacházející se ve věži na hradě Landštejn. Cílem byla charakterizace použitých surovin, stanovení jejich poměru, charakterizace porozity malt a porovnání malt z jednotlivých stavebních fází.
Keywords:
cultural heritage; Romanesque mortars; natural hydraulic lime; renders; floor mortars
Available at various institutes of the ASCR
Survey of mortars of the Romanesque chapel in the tower of Landštejn Castle
Four samples of floor mortars and two samples of plasters were analysed as a part of the survey in the Romanesque chapel located in the tower at Landštejn Castle. The aim was to characterize used raw ...
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