Cit:Siedel:2008
| Autor | Siedel, H. |
| Jahr | 2008 |
| Titel | Salt-induced alveolar weathering of rhyolite tuff on a building: causes and processes |
| Bibtex | @incollection {Siedel:2008,
title = {Salt-induced alveolar weathering of rhyolite tuff on a building: causes and processes}, booktitle = {Salt Weathering on Buildings and Stone Sculptures}, publisher = {Technical University of Denmark, Lyngby, Denmark}, year = {2008}, editor = {Ottosen, L. M. and Rörig-Dalgaard, I. and Larsen, P. K. and Brajer, I. and Bøllingtoft, P. and Marciniak, M. and Svane, M.}, address = {}, pages = {79-88}, author = {Siedel, H.} } |
| DOI | - |
| Link | https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=&ved=2ahUKEwjy_tXe6PH9AhXIQPEDHUysAssQFnoECAkQAQ&url=https%3A%2F%2Frepository.hawk-hhg.de%2Fimages%2F8%2F8a%2FSiedel-SWBSS-2008.pdf&usg=AOvVaw3F_Wa1B7RaeeGjzaDK4x63 |
| Bemerkungen | in: Ottosen, L. M.; Rörig-Dalgaard, I.; Larsen, P. K.; Brajer, I.; Bøllingtoft, P.; Marciniak, M.; Svane, M. (Hrsg.): Salt Weathering on Buildings and Stone Sculptures, Technical University of Denmark, Lyngby, Denmark, S. 79-88 |
Eintrag in der Bibliographie
| [Siedel:2008] | Siedel, H. (2008): Salt-induced alveolar weathering of rhyolite tuff on a building: causes and processes. In: Ottosen, L. M.; Rörig-Dalgaard, I.; Larsen, P. K.; Brajer, I.; Bøllingtoft, P.; Marciniak, M.; Svane, M. (Hrsg.): Salt Weathering on Buildings and Stone Sculptures, Technical University of Denmark, Lyngby, Denmark, 79-88,  |
Abstract[Bearbeiten]
Studies of stone texture and spatial distribution of soluble salts were carried out at the historical façade of the church of St. Kunigunden in Rochlitz in order to explain the occurrence of alveolar weathering on the building stone, a local rhyolithe tuff. The rhyolithe tuff contains lapilli inclusions with porosities and water uptake quite different to those of the stone matrix. No alveolar weathering was observed in the walls near the ground where gypsum was the dominant salt. In the zone above, which, in addition to nitrates and chlorides, is loaded with magnesium sulphate and gypsum, the lapilli inclusions preferentially weather out due to salt cristallization, thus forming single, isolated pits. The formation of these pits leads to a distinct spatial distribution of magnesium sulphate and gypsum. Magnesium sulphate is accumulated in sheltered position at the bottom of the holes whereas gypsum is concentrated near the surface. Accelerated weathering due to hydration/dehydration activities of magnesium sulphate causes further material loss in the holes. The enlargement of the holes becomes a self-perpetuating process at this stage. Finally they coalesce, forming mature alveolar structures with holes and ridges. The heterogeneous structure of the building stone as well as the high content of magnesium sulphate in the affected zone are preconditions for alveolar weathering in the case investigated in this study.
Keywords[Bearbeiten]
Stone masonry, tuff, lapilli inclusions, salt decay, alveolar weathering