CHC:Natural Stone in Facade Cladding
Natural Stone in Facade Cladding
Since ancient times natural stones like marble and limestone have been used for construction and artistic purposes. In recent decades, these limestones increasingly gained importance, especially in the design of thin–plate facade cladding. Facades, which are exposed to the weather, experience biological, chemical and physical processes causing a structural loosening, accompanied by a material softening, which in the long term results in a need to replace the facade at great cost.
In recent years, quite a few papers were published dealing with weathering and deformation of different marbles. Limestones, on the other hand, were very rarely mentioned. Therefore, very little is known about the weathering-related softening of Untersberger marble, one of the most important limestones in the Salzburg area.
The focus of this work is on the softening behavior of limestone caused by the action of external parameters such as temperature changes and freeze–thaw–cycles, taking into account humidity as an essential climate variable. Basis for the characterization of damage dynamics is the measuring of petrographic and petrophysical properties, taking into account the structural characteristics of freshly fractured and artificially weathered limestone samples. For this purpose, 6 different varieties of Untersberger marble were examined. For comparative purposes, 2 varieties of Sankt Margarethen limestone and Danube limestone were studied.