60 Works

Всемирное наследие ЮНЕСКО и гражданское общество

Конференция стала продолжением первого Международного форума НКО о всемирном наследии, который прошел в Санкт-Петербурге в 2012 году. Цели конференции: 1. Оценить ситуацию некоторых объектов всемирного наследия с перспективы местных акторов, 2. Найти способы участия гражданского общества в защите всемирного наследия, 3. Сформировать стратегию улучшения вовлечения гражданского общества в реализацию Конвенции «Об охране всемирного культурного и природного наследия», 4. Сформулировать механизмы участия организаций гражданского общества в реализации Конвенции, 5. Сделать шаги к формированию национальных и международных...

Aus dem Bestand marouflierter Gemälde des Kunsthistorischen Museums Wien:Restauriergeschichte und Behandlungsmöglichkeiten, exemplarisch anhand des Gemäldes Damenportrait, Leinwand auf Holz, 53 x 44 cm, nach 1600

Ute Heinisch
Die Arbeit behandelt marouflierte Gemälde aus dem Bestand des Kunsthistorischen Museums Wien in Hinblick auf die Frage, ob die Technik der Marouflage in einer Epoche oder Region als vom Künstler intendiert durchgeführt wurde oder stets Teil einer Restauriermaßnahme darstellte. Spezifische Technik und Schadensbilder werden geschildert. Eines der Gemälde wurde für eingehendere Untersuchungen und die Konservierung/Restaurierung ausgewählt; es zeigte Formatveränderung, eine Trennung des originalen Leinwandbildträgers von der Holztafel und Sicherungspapiere an der Malschicht, welche sich mit...

Lösliche Salze in Reparturmörteln

Petra Egloffstein
Präsentation der SiK Tagung Aktuelles aus Forschung und Praxis zum Thema Salz, 31.03-02.04.2016, HfBK Dresden

Schadensursachen und Salzreduktion an den Schwindfresken auf der Wartburg

Hans-Werner Zier
Präsentation der SiK Tagung Aktuelles aus Forschung und Praxis zum Thema Salz, 31.03-02.04.2016, HfBK Dresden

Zur Restaurierungsgeschichte mittelalterlicher Wandmalerei in Europa: Eine Bibliographie Raisonnée

Ursula Schädler-Saub
Eine Geschichte der Restaurierung mittelalterlicher Wandmalerei in Europa wurde bislang nicht geschrieben. Ebenso fehlt eine allgemeine Darstellung der europäischen Restaurierungsgeschichte von Kunst- und Bauwerken. Internationale Fachtagungen haben sich mit dem Thema beschäftigt, in Tagungsakten und Fachzeitschriften wurden Beiträge veröffentlicht, die sich zumeist nur mit bestimmten Aspekten der Restaurierungsgeschichte einzelner europäischer Länder befassen. Das einzige Handbuch zur Geschichte der Restaurierung von Kunstwerken hat Alessandro Conti vorgelegt, erstmals 1973, es beschränkt sich allerdings auf Italien. Die vorliegende...

Determination of the deliquescence point in salt mixtures and in in-situ multicomponent salts with DVS equipment

I. Rörig-Dalgaard
Accelerated salt induced deterioration occurs by frequently changes across the deliquescence point. Therefore does the actual deliquescence point of the present salts have a major impact on preventive conservation being able to ensure a relative humidity not causing salt phase transition and to in-situ desalination as dissolution of the salts is the essential criterion to enable transport of salt (ions) in the construction. In the present work deliquescence points were measured with dynamic vapor sorption...

Limestone resistance to sodium sulfate degradation after consolidation by hydroxyapatite and TEOS

E. Sassoni, G. Franzoni, G. Graziani & F. Sagripanti
The use of aqueous phosphate solutions to produce hydroxyapatite (HAP) inside weathered carbonate stones has recently been proposed as a new consolidating technique. In this paper, the resistance of HAP-treated stone to soluble salt crystallization was investigated. Globigerina limestone, a porous stone typically used in historic architecture in Malta and often severely affected by salt crystallization, was used. After preliminary artificial weathering by heating at 400 °C for 1 hour, aimed at producing micro-cracks opening...

Sodium sulphate test on lime-based mortars: attaining degraded material to test conservation products and assessing salt resistance

C. Nunes, Z. Slížková & J. Delgado Rodrigues
Four mortar mixtures were subjected to a sodium sulphate test, formulated to obtain degraded material for the further testing of conservation products and to estimate its salt resistance based on their hydric and hygric parameters. The ageing test involves cyclic conversion of thenardite-mirabilite. The cycle comprises of: the drying stage, salt absorption by capillarity, cooling and finally a total immersion in water. Water absorption by capillarity and microporosity determined by mercury porosimetry, were found to...

Desalination of the painted vault ribs of the Franciscan monastery church of Zeitz

W. Wedekind & Y. Rieffel
The former Franciscan monastery church was mentioned for the first time in 1266 and is located on the periphery of the old town of Zeitz, Saxony-Anhalt, Germany. After several decades of neglect, the building was in the acute danger of collapse. In the 1990s parts of the roof collapsed and the groin vaults of the church were exposed to bad weather conditions. Along with the structural problems, the structurally damaging salts, principally magnesium sulfate, were...

Consolidation of fired-clay bricks by ethyl silicate: durability to salt crystallization

E. Franzoni, E. Sassoni, G. Graziani & A. Fregnis
The resistance of ethyl silicate-consolidated bricks to sodium sulfate crystallization cycles was evaluated. A commercial ethyl silicate (ES) based product was applied by brushing with 5 or 10 strokes to assess the effect on distribution/accumulation of the consolidant inside the pores. After long-term curing, aimed at making ES-treated samples lose their temporary hydrophobicity, samples were characterized by assessing the penetration depth of consolidants, tensile strength and modifications in open porosity and pore size distribution. Resistance...

Salt extractions of brickwork: a standard procedure?

H. De Clercq & S. Godts
Crystallization of salts is recognized as a major factor in the degradation of porous materials in built heritage. Salt damage occurs in the presence of salts and moisture, in liquid or vapour form. This implies that, in case one of both can be excluded, salt damage can be mitigated. A salt extraction aims to reduce a maximum amount of salts present. In practice salt extractions are often executed without scientific background or control of its...

Nachträge und Corrigenda zum Lexikon historischer Maltechniken

Thomas Brachert
Mit diesem Nachtrag zu seinem renommierten "Lexikon historischer Maltechniken" legt Thomas Brachert eine lang ersehnte Erweiterung seiner umfangreichen Material-sammlung zur Geschichte der Kunsttechnik von 2001 vor. Er konnte dafür noch weitere historische Quellen einbeziehen, wie auch neue Forschungsergebnisse von Kollegen. Dieser Nachtrag wird seinen festen Platz neben dem Lexikon einnehmen, das in kurzer Zeit zur Standardliteratur der Konservierungswissenschaften wurde. Thomas Brachert ist gelernter Schreiner und studierte Kunstgeschichte, Kunsterziehung, Malerei, Restaurierungstechnik, Archäologie und Völkerkunde. Er leitete...

Die Skulptur Johannes der Täufer mit Taufschale in der St. Lamberti-Kirche, Hildesheim

Ina Birkenbeul
Thema der Diplomarbeit ist eine lebensgroße, vollplastische Johannes der Täufer Skulptur, die eine Taufschale hält. Die Skulptur wurde 1753 vom Hannoveraner Hofbildhauer Johann Friedrich Ziesenis (1715 – 1787) gefertigt. Die Fassung stammt von Hofvergolder Johann August Bartels (1723-1805), ebenfalls Hannover. In der kunstgeschichtlichen Betrachtung wurden Ziesenis’ Werke näher beleuchtet und der Typus von Johannes-Figuren als Träger von Taufschalen thematisiert. Die Objektgeschichte wurde rekonstruiert. Die technologische Untersuchung der Skulptur erbrachte - stark verkürzt - folgende Ergebnisse:...

EwaGlos - European Illustrated Glossary of Conservation Terms for Wall Paintings and Architectural Surfaces

Angela Weyer, Pilar Roig Picazo, Daniel Pop, JoAnn Cassar, Aysun Özköse, Vallet Jean-Marc &
EwaGlos, which has been developed in eleven languages, highlights the crucial role that professionally developed multilingual vocabularies play in international preservation campaigns. The illustrated glossary stresses the importance of common language in the conservation field, and the role that international cooperation plays in creating this common terminology. The core of the glossary comprises approximately 200 definitions of terms frequently used in specifications in the field of conservation-restoration of wall paintings and architectural surfaces. The prefaces...

Salt conversion, backfilling, and back anchoring: the securing of the painted ceiling of the Red Hall in the Neues Museum, Berlin

W. Wedekind & J. Rüdrich
In connection with the restoration of the Red Hall in the Neues Museum, located on the museums-island in Berlin (2006-2008), a procedure for salt conversion and backfilling of hollow painted plaster areas with the help of low-pressure injection technology was developed and successfully implemented. The precipitation reaction resulting from the salt conversion was assessed using electrical conductivity measurements and identification of the precipitate by x-ray diffractometric analyses (XRD). For an additional securing of the plaster...

Study of NaCl crystallization using Infrared Thermography

P. Vázquez, C. Thomachot-Schneider, K. Mouhoubi, M. Gommeaux, G. Fronteau & V. Barbin
The Infrared Thermography (IRT) technique has been widely developed during the last years. IRT is useful to observe changes in the fields of physics and chemistry, and has turned out to be an important and indispensable non-destructive technique used for investigation of civil engineering works, with special attention to cultural heritage. In this research IRT has been used to study the crystallization of NaCl solution droplets with different initial concentrations (3.5, 14 and 26% weight)....

Peering into the rock: a 4D synchrotron study of salt solution movement within masonry sandstone

C. Graham, M. Lee, V. Phoenix & M. Young
Here we report results from an initial study on salt solution movement within masonry sandstone. The capillary uptake of 6M calcium iodide solution into Blaxter and Locharbriggs sandstone was imaged by micro computed tomography scanning at three minute intervals. Over a scanning period of seven seconds/360o scan, the solution movement was successfully visualised and quantified. Results show distinct differences in the uptake characteristics of Blaxter and Locharbriggs sandstone. Flow is dominant within permeable layers in...

Further steps towards the solution of Correns’ dilemma

F. Caruso & R. J. Flatt
Correns’ and Steinborn’s pioneering experiment is probably the most intriguing one in the field of salt crystallization. It consisted of the measurement of the force needed to prevent a monocrystal of potassium alum (potassium and aluminium sulfate dodecahydrate, KAl(SO4)2∙12 H2O) from growing in various supersaturated solutions. What is puzzling is that they obtained very good agreement between their experimental data and an ideal equation of crystallization pressure. We report here the experimental advances in our...

Salt extraction of limestone by means of electrophoresis: some results on type of contact material and electrode position

H. De Clercq, Y. Vanhellemont & V De Swaef
This paper describes some results of salt extraction by means of electrophoresis on limestone contaminated with two types of salts: NaCl and Na2SO4. Limestone plates in various dimensions have been tested. The electrophoresis is evaluated in terms of the measured current during the electrophoresis process and the remaining amount of salts in the samples, determined by conductivity measurements of the water extract. Three different contact materials have been tested: cotton, cellulose fibers and a mixture...

Drying of porous building materials possibly contaminated with soluble salts: summary and findings of the DRYMASS research project

T. Diaz Gonçalves, V. Brito, J. Musacchi, L. Pel, T. Saidov, J. Delgado Rodrigues & J.M. Mimoso
Moisture causes severe and recurring anomalies in the built heritage, but removing it from the solid and thick masonry walls of old constructions is not easy, especially when soluble salts are present. These salts crystallize during drying, may harm the materials and their aesthetics. Moreover, the salts themselves and the alterations they cause affect the underlying drying process through mechanisms that require clarification. The DRYMASS project aimed at improving the current understanding of drying and...

Porosity changes after different temperature regimes for a salt weathering simulation test on Mokkattam limestone (Egypt)

N. Aly, M. Gomez-Heras, A. Hamed, M. Alvarez De Buergo & F. Soliman
This study deals with the characterization of the pore structure of fresh quarry limestone samples belonging to the Mid-Eocene Mokattam Group, and porosity changes in samples subjected to salt crystallization tests at different temperatures (20, 30 and 40 °C) in a purpose-made simulation chamber based on feeding samples by capillary imbibitions. NaCl with fixed concentration (10%) was used in the different experimental tests. One more experiment was performed using only distilled water to discriminate changes...

Konservierung-Restaurierung des mehrfach überarbeiteten Gemäldes „Musizierende Nymphen und Putti“ von Giulio Carpioni, Öl/Lwd., 98,5 x 118,4 cm (KHM Wien)

Katharina Hatzl
Die Arbeit beschäftigt sich mit der Konservierung und Restaurierung eines vorwiegend durch frühere restauratorische und konservatorische Maßnahmen beeinträchtigten Gemäldes. Die Veränderungen und Eingriffe am Gemälde wurden untersucht und mit der Restaurierungs- und Ausstellungsgeschichte der Gemäldegalerie des Kunsthistorischen Museums Wien in Verbindung gebracht. Im Zuge einer umfangreichen Testreihe wurde ein Lösungsmittelsystem für die Abnahme der Übermalungen entwickelt. Ein weiterer Teil der Arbeit umfasst die Untersuchung farblich veränderter Bildpartien. Anhand materialanalytischer Untersuchungen konnte eine Bleiweißverseifung festgestellt werden.

EwaGlos - European Illustrated Glossary of Conservation Terms for Wall Paintings and Architectural Surfaces

Angela Weyer, Pilar Roig Picazo, Daniel Pop, JoAnn Cassar, Aysun Özköse, Vallet Jean-Marc &
EwaGlos, which has been developed in eleven languages, highlights the crucial role that professionally developed multilingual vocabularies play in international preservation campaigns. The illustrated glossary stresses the importance of common language in the conservation field, and the role that international cooperation plays in creating this common terminology. The core of the glossary comprises approximately 200 definitions of terms frequently used in specifications in the field of conservation-restoration of wall paintings and architectural surfaces. The prefaces...

Measurement of sorption isotherm of porous materials influenced by salt

M. Abukuas, O. Ogura, S. Hokoi, C. Iba, S. Wakiya & T. Uno
This paper compiles the past data of the sorption isotherm of Autoclaved Aerated Concrete (AAC) laden with salts (MgCl2 and NaCl) and some new experimental data for AAC that contains Na2SO4. The results are related to the type of salt, the salt concentration and the mass of salt that is considered to be crystallised. Finally the existing mathematical model that uses the sorption isotherm for pure water and the salt content in the material is...

Gypsum efflorescence under laboratory conditions: preliminary studyH

J. Chwasts, H. Janssen & J. Elsenas
Gypsum efflorescence (GE) is a recent problem affecting modern clay brick masonry and permanently alters an aesthetic aspect of a building. This type of efflorescence affects exclusively masonry built in the last 30 years and usually appears a couple of years after construction. The GE characteristics indicate that the components are derived from the masonry itself and not from the atmosphere. The GE genesis and mechanism, and specifically the gypsum crystallisation behaviour in porous materials,...

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  • 2016
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