Variations of characteristics of sandstone subjected to weathering and conservation interventions

0532345 - ÚTAM 2021 RIV DE eng C - Konferenční příspěvek (zahraniční konf.)
Drdácký, Miloš - Frankeová, Dita - Slížková, Zuzana
Variations of characteristics of sandstone subjected to weathering and conservation interventions.
Monument future. Decay and conservation of stone. Proceedings of the 14th International congress on the deterioration and conservation of stone. Halle: Mitteldeutscher Verlag, 2020 - (Siegesmund, S.; Middendorf, B.), s. 83-88. ISBN 978-3-96311-172-3.
[International congress on the deterioration and conservation of stone /14./. Göttingen (DE), 07.09.2020-12.09.2020]
Institucionální podpora: RVO:68378297
Klíčová slova: sandstone * conservation * Charles Bridge * masonry * Funcosil
Obor OECD: Materials engineering

The paper presents selected results of a comprehensive study of characteristics and behavior of seven typical sandstone types used for historic buildings in the Czech Republic, mostly in Prague. Stone characteristics were studied on materials affected by various historic environmental impacts and conditions generated by previous interventions. From seven types of sandstone were prepared nine series of test specimens which included chemically deteriorated surface layers (crust), cleaned surface layers, and virgin material from the stone core. The above-described sets were manufactured without any consolidation treatment as well as in two further sets consolidated with two agents, namely Funcosil 100 and 300, based on the silicic acid ester. The test specimens were cut from damaged sandstone blocks, which were extracted from a masonry rail of the Charles Bridge in Prague before replacement with new elements. The results supplied data for comparing the efficiency of the consolidation treatment with silicic acid ester products in relation to three pre-treatment stone conditions, as well as to the type of sandstone cementation (mostly a kaolin or silica, rarely goethite cementation). In the paper, the most important results and conclusions taken from the tests and their comparison are discussed.
Trvalý link: http://hdl.handle.net/11104/0310856