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Effect of ethylsilicate consolidating agents on behaviour and properties of glaukonitic sandstone used to building of St. Vitus´ Cathedral
Drdácký, Miloš ; Slížková, Zuzana ; Valach, Jaroslav
This report is focused on testing and evaluating of properties of chosen consolidating agends for concervation of relief bust in external triforium of St. Vitus´ Cathedral on Prague Castle (CZ). All tested agends contained ethyl ester of silicic acid (ethylsilicate) as active ingredient and were one-component. Penetration deepness of agends into sandstone and sandstone properties after application consolidating agends: bending strenght, modulus of elasticity, thermal expansion, vapour water permeability, hygric expansion were observed. The evaluated agends behaviour very similarly and there are no dramatically better or worse agends. All agends penetrate quite well into sandstone and relatively deep and increase strength of sandstone after impregnation.
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Survey and assessment of the National museum building in Prague
Drdácký, Miloš ; Slížková, Zuzana
The report presents results of a complex survey of the health conditions and damages and failures of the building of the National museum in Prague. It further summarizes scientific investigations of the loads, namely of winds in situ as well as on models in a climatic wind tunnel where also soiling was tested. The results of material analyses and public attitude to soiling and failures on the façade are involved, too. The report has a rich photographic annex.
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