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== Abstract == | == Abstract == | ||
The deterioration of porous building materials caused by single salts has been investigated extensively. Recently, more emphasis is given to the assessment of salt mixtures. Since a few years the ECOS/RUNSALT model is being used for the interpretation of the crystallization behavior of detected ion mixtures. The double salt bloedite or | The deterioration of porous building materials caused by single salts has been investigated extensively. Recently, more emphasis is given to the assessment of salt mixtures. Since a few years the ECOS/RUNSALT model is being used for the interpretation of the crystallization behavior of detected ion mixtures. The double salt bloedite or Na<sub>2</sub>Mg(SO<sub>4</sub>)<sub>2</sub>.4H<sub>2</sub>O is frequently found in the output of the predictive model. However, the crystallization behavior and the destructive effects of double salts such as bloedite are generally not documented. This paper presents the results of a research project carried out to assess the behavior of sodium magnesium sulfate in limestone related to that of the respective single salts. Limestone samples were contaminated with aqueous solutions of equimolar mixtures of sodium and magnesium sulfate at different concentrations and conditioned at different environmental conditions. The drying behavior as well as the crystallization behavior upon repeated drying-rewetting cycles was investigated. Identification of efflorescence was carried out by micro-Raman spectroscopy and XRD. The results indicate in general that the (initial) drying rate is an important factor for efflorescence development, which is influenced by ambient RH as well as the concentration of the salt solution used for the contamination of the samples. | ||
== Zugehörige Primärdaten == | == Zugehörige Primärdaten == | ||
Version vom 14. Januar 2016, 14:31 Uhr
| Autor | Godts, S. and Hendrickx, R. and De Clercq, H. |
| Jahr | 2014 |
| Titel | The crystallization behavior of sodium magnesium sulfate in limestone |
| Bibtex | |
| DOI | 10.5165/hawk-hhg/255 |
| Link | Datei:13 SWBSS-2014 Godts etalx.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 2028, S. 167-183 |
Eintrag in der Bibliographie
| [Godts.etal:2014] | Godts, S.; Hendrickx, R.; De Clercq, H. (2014): The crystallization behavior of sodium magnesium sulfate in limestone. 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 167-183, https://doi.org/10.5165/hawk-hhg/255. |   |
Keywords[Bearbeiten]
bloedite, konyaite, limestone, deterioration, conservation
Abstract[Bearbeiten]
The deterioration of porous building materials caused by single salts has been investigated extensively. Recently, more emphasis is given to the assessment of salt mixtures. Since a few years the ECOS/RUNSALT model is being used for the interpretation of the crystallization behavior of detected ion mixtures. The double salt bloedite or Na2Mg(SO4)2.4H2O is frequently found in the output of the predictive model. However, the crystallization behavior and the destructive effects of double salts such as bloedite are generally not documented. This paper presents the results of a research project carried out to assess the behavior of sodium magnesium sulfate in limestone related to that of the respective single salts. Limestone samples were contaminated with aqueous solutions of equimolar mixtures of sodium and magnesium sulfate at different concentrations and conditioned at different environmental conditions. The drying behavior as well as the crystallization behavior upon repeated drying-rewetting cycles was investigated. Identification of efflorescence was carried out by micro-Raman spectroscopy and XRD. The results indicate in general that the (initial) drying rate is an important factor for efflorescence development, which is influenced by ambient RH as well as the concentration of the salt solution used for the contamination of the samples.