DOI: 10.5593/sgem2012/s01.v1030


Wednesday 1 August 2012 by Libadmin2012

References: 12th International Multidisciplinary Scientific GeoConference, www.sgem.org, SGEM2012 Conference Proceedings/ ISSN 1314-2704, June 17-23, 2012, Vol. 1, 265 - 270 pp


Weathering processes lead to deterioration of dimension stones and to changes in their
durability. The range of the deterioration depends on petrography, including internal
structure, mineral and matrix composition, and also changes initiated. The stone’s
properties are negatively influenced especially during the winter frost period. The
presence of salt can exacerbate this process. The Czech national standardized testing
methods for natural stone, such as determination of frost resistance and determination of
resistance to salt crystallisation, may not take into consideration the actual conditions in
the stone’s locality. This paper is focused on the description of an alternative procedure
of stone durability determination and on the evaluation of induced changes. To simulate
the weathering processes typical in Prague’s winter climatic conditions, seasonal data
from 1999 to 2008 were statistically analyzed. Samples of snow/water mixtures from
Prague city centre were chemically analyzed to determine the average NaCl
concentration. Three Cretaceous sandstones - Božanov, Hořice and Kocbeře - were
tested during this experiment. Developed changes in the internal structure were studied
using Hg porosimetry. Physical-mechanical properties, such as water absorption at
atmospheric pressure, uniaxial compressive strength, apparent density and open
porosity, were also studied.

Keywords: sandstone properties, weathering, winter, Prague.

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