Cit:Lindstroem.etal:2014

Autor	Lindström, N. and Talreja, T. and Linnow, K. and Steiger, M.
Jahr	2014
Titel	Crystallization behavior of a Na2SO4MgSO4 salt mix-ture and comparison to single salt behavior
Bibtex
DOI	10.5165/hawk-hhg/258
Link	Datei:11 SWBSS-2014 Lindstroem 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 2031, S. 151-165

Eintrag in der Bibliographie

[Lindstroem.etal:2014]

Lindström, N.; Talreja, T.; Linnow, K.; Steiger, M. (2014): Crystallization behavior of a Na2SO4–MgSO4 salt mixture and comparison to single salt behavior. 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 151-165, 10.5165/hawk-hhg/258.

Keywords

sodium sulfate, magnesium sulfate, salt mixtures, bloedite, konyaite

Abstract

Crystals growing in confined spaces can generate stress and are a major cause of damage in porous materials. While the behavior of several single salts is well characterized, only few studies have been carried out on the behavior of salt mixtures and, especially, mixtures involving the formation of double salts have not been systematically investigated. Double salts show a complex crystallization behavior and an incongruently soluble salt may have a great damage potential, because a solution supersaturated with one of its single salt compounds is formed during its dissolution. In this study we report on wetting-drying experiments with an equimolar Na₂SO4MgSO₄ salt mixture. In situ Raman microscopy was used to study the phase transformations during the wetting of the double salts Na₂Mg(SO₄)₂4H₂O (bloedite) and Na₂Mg(SO₄)₂5H2O (konyaite). Though both salts are incongruently soluble and should form mirabilite upon dis-solution, it was found that they behave similar to congruently soluble salts. Most likely, the resulting supersaturation is not sufficient for mirabilite nucleation to occur. Due to the low supersaturation the damage potential of the dissolution of the incongruently soluble double salts bloedite and konyaite is not only much lower than that of sodium sulfate and magnesium sulfate but also in comparison to the incongruently soluble double salt darapskite.

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