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Repair mortar for a coloured layer of sgraffito render – a technological copy

Identifikátory výsledku

  • Kód výsledku v IS VaVaI

    <a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68378297%3A_____%2F22%3A00561611" target="_blank" >RIV/68378297:_____/22:00561611 - isvavai.cz</a>

  • Výsledek na webu

  • DOI - Digital Object Identifier

Alternativní jazyky

  • Jazyk výsledku

    angličtina

  • Název v původním jazyce

    Repair mortar for a coloured layer of sgraffito render – a technological copy

  • Popis výsledku v původním jazyce

    Sgraffito technique was used to decorate renders by scratching the top layer of lime wash in the Renaissance time. This technique required both artistic and craft skills and its quality and durability relied on the selected materials. In order to contribute to the preservation of surviving sgraffiti in the town of Slavonice in the Czech Republic a study was carried out assessing the possibility to replicate the original materials and the application techniques. Historical sgraffito layers were sampled in situ and studied in a laboratory by commonly used analytical methods - OM, TA, XRD, SEMEDS. The raw materials, lime binder and sand, were characterised and the mixing proportion app. 1 to 0.7 (vol.) of lime putty to sand was determined. The character of the raw materials was compared with the locally known resources and their probable provenance was localised. Based on the character of the local limestone, a similar raw material was obtained and burnt in an experimental lime kiln to produce quicklime. The sand was obtained locally from an old and disused pit quarry. The possibility to obtain the raw materials that came from similar sources as the historic ones allowed us to study possible production technologies and application techniques. The ways the raw materials were processed and the mortar applied were verified by a series of practical experiments. These included the use of lime putty v. dry slaked hydrate, the thickness of a layer, trowelling and final finishing, time span before application of lime wash, timing of drawing and scratching. In addition, the performance of the produced mortar mix was assessed by mechanical and physical tests. Compressive and flexural strengths, capillary absorption, drying index, open porosity and water vapour diffusion coefficient were determined on standard prism specimens as well as on mortar specimens cut from wall panels. The mortar was tested in two sets with different consistencies due to mixing water content. The tests pointed out the influence of application methods on the performance. The mortar properties were positively evaluated especially in terms of porous structure and water vapour permeability. The mortar, designed as a material replica of the original, was used in a conservation project on a façadenof a house, where missing parts of a sgraffito render were reconstructed.

  • Název v anglickém jazyce

    Repair mortar for a coloured layer of sgraffito render – a technological copy

  • Popis výsledku anglicky

    Sgraffito technique was used to decorate renders by scratching the top layer of lime wash in the Renaissance time. This technique required both artistic and craft skills and its quality and durability relied on the selected materials. In order to contribute to the preservation of surviving sgraffiti in the town of Slavonice in the Czech Republic a study was carried out assessing the possibility to replicate the original materials and the application techniques. Historical sgraffito layers were sampled in situ and studied in a laboratory by commonly used analytical methods - OM, TA, XRD, SEMEDS. The raw materials, lime binder and sand, were characterised and the mixing proportion app. 1 to 0.7 (vol.) of lime putty to sand was determined. The character of the raw materials was compared with the locally known resources and their probable provenance was localised. Based on the character of the local limestone, a similar raw material was obtained and burnt in an experimental lime kiln to produce quicklime. The sand was obtained locally from an old and disused pit quarry. The possibility to obtain the raw materials that came from similar sources as the historic ones allowed us to study possible production technologies and application techniques. The ways the raw materials were processed and the mortar applied were verified by a series of practical experiments. These included the use of lime putty v. dry slaked hydrate, the thickness of a layer, trowelling and final finishing, time span before application of lime wash, timing of drawing and scratching. In addition, the performance of the produced mortar mix was assessed by mechanical and physical tests. Compressive and flexural strengths, capillary absorption, drying index, open porosity and water vapour diffusion coefficient were determined on standard prism specimens as well as on mortar specimens cut from wall panels. The mortar was tested in two sets with different consistencies due to mixing water content. The tests pointed out the influence of application methods on the performance. The mortar properties were positively evaluated especially in terms of porous structure and water vapour permeability. The mortar, designed as a material replica of the original, was used in a conservation project on a façadenof a house, where missing parts of a sgraffito render were reconstructed.

Klasifikace

  • Druh

    D - Stať ve sborníku

  • CEP obor

  • OECD FORD obor

    20501 - Materials engineering

Návaznosti výsledku

  • Projekt

    <a href="/cs/project/DG20P02OVV028" target="_blank" >DG20P02OVV028: Možnosti radiouhlíkového datování historických malt</a><br>

  • Návaznosti

    P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Ostatní

  • Rok uplatnění

    2022

  • Kód důvěrnosti údajů

    S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Údaje specifické pro druh výsledku

  • Název statě ve sborníku

    Proceedings of the 6th Historic Mortars Conference - HMC 2022

  • ISBN

    978-961-6884-77-8

  • ISSN

  • e-ISSN

  • Počet stran výsledku

    15

  • Strana od-do

    235-248

  • Název nakladatele

    University of Ljubljana

  • Místo vydání

    Ljubljana

  • Místo konání akce

    Lublaň

  • Datum konání akce

    21. 9. 2022

  • Typ akce podle státní příslušnosti

    WRD - Celosvětová akce

  • Kód UT WoS článku