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Modification of protective lime coating systems for the porous limestone using lime nanomaterials: assessment of mechanical properties and ageing resistance
Navrátilová, Michaela ; Bayer, K. ; Ghaffari, E. ; Macounová, Dana ; Slížková, Zuzana ; Weber, J.
Within the area of care for sculptural and architectonic monuments of limestone in Austria there has been a historic continuity of use of protective lime coatings. In the regions of Upper and Lower Austria, Vienna and Burgenland mainly Leitha limestone (named after the Leitha Mountains) are dealt with. In Czech lands such approach was disrupted from 19th century by application of the “purist” idea of bare surface of stone. Nevertheless, this treatment of stone surface has been coming back into use for many various reasons in the past few decades. Requirements for preservation of pieces of art and handcraft made of limestone using lime coatings are most often applied in the regions of Vyso!ina, South Moravia and South Bohemia, which directly border on the Northern States of Austria. Owing to the resource locations of Leitha limestone in these regions, there is a higher representation of cultural heritage monuments made of this type of stone in the Czech Republic.
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Consolidation testing of porous limestone using lime nanomaterials: optimization, assessment of stone mechanical and structural characteristics
Macounová, Dana ; Bayer, K. ; Ghaffari, E. ; Navrátilová, Michaela ; Slížková, Zuzana ; Weber, J.
In consequence of an array of degradation mechanisms there is a change of stone characteristics used in historic objects. One of the negative changes is deterioration of mechanical properties, which may often lead to losses of original substance and gradual disintegration of works of art or handcraft made of stone. To prolong the lifespan of such damaged cultural-heritage objects a process called consolidation is often carried out within the framework of conservation treatment. During the process of conservation treatment the damaged stone is impregnated with a consolidating material, which is to provide the stone with a new binder capable of renewing its cohesion to a certain extent. Currently, a wide range of organic and inorganic consolidating agents of various characteristics is available, from synthetic polymers to silicic acid esters. Long-term experience shows that not only is the consolidating effect of the actual agent important, but also its lifespan and impact on the subsequent aging of the treated stone. Thus, in the past few years more emphasis has been laid on the compatibility or – to express it more precisely – the material similarity of the agents used in the process of conservation and restoration of works of art or handcraft.
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