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Pore and hygric properties of porous limestones: a case study from Bratislava, Slovakia

By
Marek Laho
Marek Laho
1
Department of Engineering Geology
,
Comenius University
,
Bratislava
,
Slovakia
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Christoph Franzen
Christoph Franzen
2
Institut für Mineralogie & Petrographie
,
Leopold-Franzens-Universität Innsbruck
,
Innrain 52, A-6020 Innsbruck
,
Austria
3
Present address:
Institut für Diagnostik und Konservierung an Denkmalen in Sachsen und Sachsen-Anhalt e. V.
,
Schloßplatz 1, 01067 Dresden
,
Germany
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Rudolf Holzer
Rudolf Holzer
1
Department of Engineering Geology
,
Comenius University
,
Bratislava
,
Slovakia
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Peter W. Mirwald
Peter W. Mirwald
2
Institut für Mineralogie & Petrographie
,
Leopold-Franzens-Universität Innsbruck
,
Innrain 52, A-6020 Innsbruck
,
Austria
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Published:
January 01, 2010

Abstract

Most historic stone monuments in Bratislava (Slovakia) are built with various types of porous, light and weakly cemented sedimentary rocks. These Neogene sandstones and limestones, also known as Leitha limestones, were quarried in the Vienna Basin. The various sedimentary environments are reflected in the heterogeneity of lithotypes and their cementation. The distinctly different pore structure of these rocks is reflected in their very variable physical properties and consequently in the distinct durability. Petrographic and petrophysical properties were determined on main ashlar types of the two most important historical monuments of Bratislava, the Castle and St Martin's Cathedral. Fresh samples of Leitha limestones were also obtained from the existing or abandoned quarries. The study includes a detailed petrographic examination of major rocks types and an assessment of their mineralogical composition by X-ray diffraction and microscopy. Hygric properties and porosity influence the weathering stability and the chances to apply conservation treatment. Parameters such as pore volume, pore size distribution by mercury porosimetry, specific surface of pores by nitrogen adsorption (BET) analysis as well as water sorption, capillary water uptake and drying behaviour were measured and compared for the six studied lithotypes.

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Contents

Geological Society, London, Special Publications

Natural Stone Resources for Historical Monuments

R Přikryl
R Přikryl
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Á Török
Á Török
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Geological Society of London
Volume
333
ISBN electronic:
9781862395817
Publication date:
January 01, 2010

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