(c) Rachaimer sandstone sculpture
Strasbourg Cathedral
The red Vosges sandstone (Main Buntsandstein) is strongly affected by weathering. Particularly acidic flue gases (sulfur dioxide, nitrogen oxides), salts, organic acids, but also make carbon dioxide to create the porous sandstone. With acids and salts laden rain water penetrates into the sandstone and destroyed the one hand, the binder, on the other hand, it leads to capillary migration of salt solutions to the outside when the stone dries. Evaporates the water remains behind the salts, which may cause the crystallization to blow up the rock.
added In the example shown here, lost the sandstone inside its strength by the destruction of the iron-containing binder, but except of a crust has formed, which is partially detached. Brown patina on the statue is due to dirt and iron oxide Hydra Tabla Gerung.
Literature:
D IETMAR R sheering :
stone customer
An introduction for engineers, architects, preservationists and stonemasons
Enke Verlag Stuttgart 1991
added In the example shown here, lost the sandstone inside its strength by the destruction of the iron-containing binder, but except of a crust has formed, which is partially detached. Brown patina on the statue is due to dirt and iron oxide Hydra Tabla Gerung.
Literature:
D IETMAR R sheering :
stone customer
An introduction for engineers, architects, preservationists and stonemasons
Enke Verlag Stuttgart 1991
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