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Historiska bruk på Läckö slott - fasadrestaurering och forskningsinsatser 2002-2009

Report
Authors Ewa Sandström Malinowski
ISBN 978-91-981406-4-4
Publisher Göteborgs universitet, Institutionen för kulturvård
Place of publication Göteborg
Publication year 2016
Published at Department of Conservation
Language sv
Links hdl.handle.net/2077/49953
Keywords fasadrestaurering, kalkbruk, historiska kalkbruk, kalkbränning, kalksläckning, "hot lime” (stukasläckning), kalkrika bruk, analys av kalkbruk, tunnslip, dokumentation av kalkbruk, Läckö slott
Subject categories Architectural conservation and restoration, Architectural Engineering, History of Technology

Abstract

Läckö Castle, situated on the southern shore of Lake Vänern, was built on medieval foundations with walls of stone and brick covering a core of lime concrete. It was enlarged gradually to its present shape in the late seventeenth century. The castle is today a national monument and a main tourist attraction, owned and managed by the National Property Board. In the 1960s the entire exterior was replastered with hard, cementitious mortar, a measure that with time caused serious damage to the facades and the interiors. In response to accelerating deterioration, the National Property Board initiated a research project Historic Mortars at Läckö Castle in collaboration with Dept. of Conservation at the University of Gothenburg. The objective of the Läckö research was to develop repair mortar and plaster that would be compatible, both historically and technically, with that used in the original structure. The research also aimed to revive historic methods of mortar production, application techniques and skills and to adjust these to modern conservation practices. The newly produced mortars should meet the technical demands in terms of durability, reparability and appearance. The ambition was also to develop methods of testing, documentation and evaluation that could be generally applied to other projects. Knowledge of local materials and original building methods were important prerequisites for a successful restoration practice. The experimental part of the research was conducted between the years 2002 and 2009; from 2007 as a full-scale restoration undertaken on two principal facades. The research team included architects, material scientists (chemist, geologist, and civil engineer), buildings archaeologist, master-plasterer and lime burner, in addition to the representative of the managing authorities. The following report presents the combined research and building site practice (masonry repair and plastering) and the project’s progression and achievements. It contains two main parts: • Historic mortars: documentation of the original mortars and experiments with new mortar produced according to ”historical prescriptions”. • Restoration process: development of materials and methods, from lime burning to the application on the walls, as well as evaluation of the cured mortar by examination in situ and in laboratory (observation, physical testing and microscopy of thin sections). The report discusses and compares properties of mortar prepared from conventional lime-putty and hot lime-mix, and their advantages and disadvantages. It discusses also the differences between the characteristics of lime-rich historic mortars and modern lean mortars. The final, concluding chapter summarizes the motives behind the choice of different mortars and methods, and suggests/recommends future strategies for the restoration of the facades at Läckö Castle.

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