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The methodology for the selection of appropriate restoration work
Machačko, Luboš ; Gláser, Petr ; Bartoš, L. ; Bayer, K. ; Ďoubal, J. ; Justa, P. ; Vojtěchovský, J. ; Krhánková, K. ; Vácha, Z. ; Wichterlová, Z.
The aim of this methodology is to present a recommended procedure which leads to selection of optimal restoration intervention. Selection of the appropriate procedure and method of restoration and reconstruction is the primary prerequisite for the quality and efficiency of future work.
Fulltext: content.csg -  PDF
Plný tet: 0457228_2015_Glaser_Machacko_Metodika_pro_vyber_vhodneho_restauratorskeho_zasahu - PDF
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Repair formulations for fine-grained stone arte-facts
Tišlová, R. ; Novotná, Adéla
Stone restoration practice continuously deals with the problem of the selection of suitable repair materials. In establishing the requirements that guide their specification, the fundamental aim should always be to achieve the best compatibility between the substrate and the repair. When dealing with the restoration of stone, several aspects must be taken into consideration: not only the way in which compatibility influences the durability and structural and environmental resistance of the repair, but also the properties of the stone substrate itself must be considered. Compatibility is a highly complex problem but when considering the above mentioned aspects, functional compatibility – the compliance between physical and mechanical characteristics of the materials – is the most critical in prolonging the sustainability of the repair.
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Repair mortars/artificial stone for restoration of biodetritic limestones
Tišlová, R. ; Novotná, Adéla
This study deals with the properties of repair mortars for two types of biodetritic limestones from Kutná Hora and St. Margarethen (Austria). The binder of the mixtures was based on natural hydraulic lime (NHL), which has good processability and fits to optical properties of the substrates. Properties of repair mortars were modified by the type of aggregate (crushed rock, normalized quartz sand and mixture of aggregates). The artificial stone samples were characterized by means of the microstructure description and measurement of selected physical and mechanical properties.
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Properties of commercially available, ready-to-use mortars for restoration of historic renders and masonry
Janotová, Dana ; Niedoba, Krzysztof ; Gláser, Petr ; Šašek, Petr ; Fabeš, Roman
There is a wide range of premixed, dry mortars, on the market, designed with the reconstruction of historic renders and masonry in mind. The use of such materials has some advantages, including good workability and standard quality, however, due to unknown composition, being a secret of a manufacturer, it is frequently impossible to predict their influence on the substrate and on the ageing. If the ready-to-use mortar is to be applied during the renovation of the historic masonry, it is necessary to know: how close the mortars’ properties match the properties of the original material; will the repair be durable enough and will it degrade faster than the original material. Technical information, provided by the manufacturer, does not contain such data. The only parameters given, are the strength, porosity of hardened mortar and water vapour diffusion coefficient, however, it is not specified in which conditions these values were measured.
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3D scanning technology in the hands of the conservator-restorer
Gláser, Petr
3D scanning technology is undoubtedly a modern progressive techniques that, especially in some areas, are increasingly applied. It is no different in the field of care for our cultural heritage. Relatively simple method brings, thanks to the quick development of means of implementation, still new applications and can deliver a wide range of important information. The devices are user friendly and comparatively affordable. These are just additional reasons for the fact that 3D scanning more applied in the fields of restoration. \nA short paper describes the technique of 3D scanning from the conservator-restorer's perspective and is focused primarily on understanding their capabilities, but does not forget those restrictions, which are always crucial. From time to time there is a tendency to uncritical promotion of certain methods or means. Many similar cases we also known in the field of cultural heritage and it seems that the 3D scanning method is well suited to become the next one.\n
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Some notes about stone monuments current methods of cleaning
Gláser, Petr
This paper is dedicated to cleaning of stone monuments. Both technical and aesthetic point of view of the cleaning process are concerned and also the historic development in the conservation approach including various starting points, objectives and the social influence. The paper moreover describes recent procedures in monuments cleaning. It contains also an overview of the postulates of compatible conservation intervention (cleaning) and focuses on important issues that need to be responsibly solved.
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