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'''Hans-Jürgen Schwarz, Erwin Stadlbauer, Rolf Niemeyer (2009)''': Diagnostic investigations to define the possibility and the effectiveness of desalination with the poultice-technique - a case study.- In: Ottosen, LM. et al. (Eds.), Salt Weathering on Buildings and Stone Sculptures. Technical University of Denmark, Proceeding of the conference in Copenhagen 22-24 October 2008, pp. 237-248
{{:repository:Schwarz.etal_2008}}
 
[[Category:Literatur]]
== Keywords ==
 
Desalination, wall painting, Mirowski method, droplet method, poultice.
 
== Abstract ==
 
The contamination of the walls, especially the surfaces with salt and a salt solution is
often one of the biggest problems concerning the conservation concept of wall
paintings. A good example for that is the Cathedral in Königslutter in Northern
Germany.
The wall paintings of the Cathedral in Königslutter go back to a medieval wall
painting, which was painted over at the end of the 19th century. In the second half of
the 20th century large amounts of cement suspension were injected into the walls to
stabilize the static of the building, which started the damaging process essentially by
salt crystallisation at the inner surfaces of the cathedral. After the outbuilding was
completely repaired in 2006 the conservation of the wall paintings, plasters etc. in the
cathedral begun.
The analyses of surface samples and the drill - sampling show a high salt content
consisting of sulphate and calcium ions, nitrates (mostly together with potassium but
also with calcium) and rarely chloride and sodium. Salt efflorescences are often made
of gypsum partially together with Calcite as a sinter crust. Fluffy efflorescences
consist of niter. The total amount of salt only in some cases decrease with the depth of
sampling.
To extract the salts in the wall painting and in the plaster the poultice method was
chosen. Before applying this method the surfaces have to comply with the
requirements for a successful application e.g. the moisture transport characteristics.
The results show clearly that the first plaster layer, which is slightly hydrophobic in
some parts, very slowly transported moisture. Despite the low moisture transport rates
the poultice method was tested, because salt action is the most damaging process. The
application tests show that only a small amount of salt can be extracted.
 
== Volltext ==
 
Die vollständige Publikation finden sie unter [[Datei:SWBSS2008_Schwarzetal.pdf]]
 
== Anlagen ==
 
 
== Zitierte Literatur  ==
 
 
 
[[Category:Volltext]] [[Category:Literatur]]

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