Most natural rocks are characterised by a significant anisotropy in a macroscope scale. Even if we identify the group of minerals with properties close to isotropy (i.e. no difference in physical properties of the material), there is still a difference between their tensile strength and the ultimate compressive strength. The value of compression is about 10 times higher. Knowing about these basic properties, dressed stone blocks had to be built in the constructions whose shapes generated compression states as dominating. Arches, just like walls and columns, belong to that type of constructions.
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