|Autor||Stahlbuhk, A. and Nissen, J. and Linnow, K. and Steiger, M.|
|Titel||Influence of the salt concentration on the damage potential of mirabilite and thenardite|
|Link||Datei:3 SWBSS-2014 Stahlbuhk etal.pdf|
|Bemerkungen||In: De Clercq, Hilde (editor): Proceedings of SWBSS 2014. Third International Conference on Salt Weathering of Buildings and Stone Sculptures Royal Institute for Cultural Heritage, Brussels, Belgium, 14-16 October 2044, S. 35-48|
Eintrag in der Bibliographie
|[Stahlbuhk.etal:2014]||Stahlbuhk, A.; Nissen, J.; Linnow, K.; Steiger, M. (2014): Influence of the salt concentration on the damage potential of mirabilite and thenardite. In: Hilde De Clercq (Hrsg.): Proceedings of SWBSS 2014 3rd International Conference on Salt Weathering of Buildings and Stone Sculptures,KIK-IRPA, Royal Institute for Cultural Heritage Brussels 35-48, 10.5165/hawk-hhg/271|
damage potential, thenardite, mirabilite, salt concentration, pore filling ratio
The present study reports on the damage potential of the crystallization of either thenardite or mirabilite in porous sandstone. Specimens of Sand sandstone with different loads of sodium sulfate were exposed to wetting-drying cycles at different conditions to rank the damage potential of different crystallization pathways and to investigate the influence of the salt concentration on the damage process. The damage intensity was assessed by visual inspection and mass loss curves. In general, the well-known extreme damage potential of thenardite dissolution and subsequent mirabilite crystallization is confirmed. Under such conditions, the damage potential increases with increasing salt load which is confirmed by the calculation of the effective stresses and comparison with the tensile strength of Sand sandstone. Considering the pore filling ratio with respect to the crystallizing phase, it turns out that thenardite crystallization during evaporation can cause as much damage as the crystallization of mirabilite during wetting of thenardite. Finally, it is demonstrated that wetting by slow deliquescence of thenardite can also be very destructive, though it is yet unclear which phases actually crystallize out under such conditions.
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