Dolmabahçe Sarayı Cephelerinde Kullanılan Volkanik Tüflerin Konsolidasyonu İçin Yapılan Deneysel Çalışmalar

Seden Acun Özgünler; Ahmet Ersen

THE EXPERIMENTAL WORKS ON THE CONSOLIDATION OF VOLCANIC TUFFS USED IN THE FACADES OF DOLMABAHCE PALACE

Year 2011, Issue: 7, 41 - 48, 01.12.2011

Abstract

This paper presents the consolidation of the Şirinçavuş and Karamursel volcanic tuffs which were widely used in Dolmabahçe Palace. The research on the consolidation of the volcanic tuffs was based on a longterm experimental programme. The first treatments were with a methyl acrylate and ethyl metacrylate copolymer+water repellent. The untreated samples were characterized and their deterioration processes and morphologies were detected by SEM-EDXA and ICP. The efficacy of the treatment was controlled by the comparison of the results of the tests which were conducted to determine the physical properties of the untreated and treated samples. The results seemed to be unsatisfactory. The research was continued by water repellent impregnations to prove the theory on the conservation of volcanic tuffs with total surface protection which claimed a better performance over consolidant+water repellent treatments. The treatments which silane-siloxane micro emulsions gave promising results. Further work was continued on different volcanic tuff which was quarried from Yalova-Karamursel region and was subjected to similar deterioration medium which had sea spray and air pollution as major decay causes. The samples were characterized by tests for the determination of the physical, petrographic properties and mineral composition. Consecutively they were treated with a consolidant+water repellent and a water repellent on its own. The improvement in physical properties, the deposition and the settlement of the polymer films in the pores by means of Mercury Intrusion, X-Ray Diffraction Analysis, SEM-EDS were detected. Artificial ageing tests such as salt crystallisation and freeze-thaw cycles were conducted to clarify the protective effect of the overmentioned impregnations. In this case the results proved the opposite of the theory on the efficacy of the total surface protection by water repellents on their own

References

Acun, S., Güleç, A., Ersen, A., 2003,“Effıcacy Of The Consolıdants And The Water Repellents For The Conservatıon Of Şırınçavuş Volcanıc Tuff”, International Symposium: Industrial Minerals and Building Stones, 15-18 Eylül 2003, Istanbul, Tur- key, pp.363-370.
Acun Özgünler, S., 2007, Tarihi Yapılarda Kullanılan Volkanik Tüflerin Konservasyonu Üzerine Bir Araştırma : Od Taşı Örneği, İTÜ Fen Bilimleri Enstitüsü Doktora tezi, İstanbul.
Bianchetti, P.L., Lombardi, G., Meucci, C., 1982, “The Study of the Degradation of Tuff Blocks Used in the Roman Temple of Cibeles (Rome, Italy)”, Proceedings of the 4th International Congress on the Deterioration and Preservation of Stone Objects, Lo- uisville, July 7-9, pp.29-38.
De Witte, E., 1993, “Conservation of the Göreme Rock”, The Safeguard of the Rock-hewn Churches of the Göreme Valley, Procee- dings of the International Seminar, Ürgüp-Capadocia, Turkey, pp.109-124.
Ersen, A., Acun Özgünler, S., “A Research About Consolidation of Natural Stones Used in the Facades of Dolmabah- çe Palace”, 150. Yılında Dolmabahçe Sarayı Uluslararası Sempozyumu, 22-25 Kasım 2006, İstanbul.
Gürdal, E., Ersen, A., Güleç, A., Baturayoğlu, N., 2000, “Deterioration and Consolidation of the Şirinçavuş Volcanic Tuff”, 2nd International Congress on Studies in Ancient Structures, Istanbul, Turkey, pp.627-636.
Leroux, L., 2000, “Measuring the Penetration Depth of Consolidating Products: Comparison of Six Methods”, 9th In- ternational Congress on Deterioration and Conservation of Stone, Proceedings, Volume 2, Venice, pp.361-369.
Wheeler, G.S., Newman, R., 1990, “Analysis and Treatment of A Stone Urn from the Imperial Hote, Tokyo”, Lavas and Volcanic Tuffs, Proceedings of the International Meeting, Easter Island, Chile, October 25-31, pp.157-161.
DIN 52615, 1973, Determination of Water Vapour (moisture) Permeability of Construction and Insulating Materials, Deutsche Norm, Germany.
TS 699, 1978, Doğal Yapı Taşlarının Muayene ve Deney Metodları, Türk Standartları Enstitüsü, Ankara.
TS EN 1925, 2000, Doğal Taşlar Deney Metodları- Kılcal Etkiye Bağlı Su Emme Katsayısının Tayini, Türk Standartları Enstitü- sü, Ankara.
TS EN 12370, 2001, Doğal Taşlar Deney Metodları- Tuz Kristallenmesine Direncin Tayini, Türk Standartları Enstitüsü, Ankara. 13- TS EN 12371, 2001, Doğal Taşlar Deney Metodları- Dona Dayanıklılık Tayini, Türk Standartları Enstitüsü, Ankara.