Salt and ice crystallisation in porous sandstones |
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| Authors: | Joerg Ruedrich Siegfried Siegesmund |
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| Institution: | (1) Geoscience Center University Goettingen, Goldschmidtstr. 3, 37077 Goettingen, Germany |
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| Abstract: | Salt and ice crystallisation in the pore spaces causes major physical damage to natural building stones. The damaging effect
of these processes can be traced back to physically induced stress inside of the rock while crystallizing. The increasing
scientific research done during the past century has shown that there are numerous parameters that have an influence on the
weathering resulting from these processes. However, the working mechanisms of the stress development within the rock and its
material dependency are still subject to discussion. This article gives an overview of salt and ice weathering. Additionally,
laboratory results of various sandstones examined are presented. Salt crystallisation tests and freeze/thaw tests were done
to obtain information about how crystallisation weathering depends on material characteristics such as pore space, water transportation,
and mechanical features. Simultaneous measuring of the length alternating during the salt and ice crystallisation has revealed
detailed information on the development of crystal in the pore spaces as well as the development of stress. These findings
can help to understand the damaging mechanisms. |
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| Keywords: | Salt and ice crystallisation Sandstone Physical weathering processes Length change behaviour Stone deterioration |
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