Lime burning tradition in field kilns – a case study of the Jämtland tradition in Sweden

Abstract eng:
This study focuses on the local lime tradition in the region of Jämtland, in central Sweden. Local lime was used when building the medieval stone churches and since they are in a need of restoration there is subsequently a need for understanding the use of local lime. The geology of Jämtland contains several layers of limestone in the folded mountains. There is a broad spectrum ranging from pure Silurian limestone to clay containing Ordovician limestone, giving all kinds of lime from pure air lime to strong hydraulic lime. The preserved historic mortars have mostly been made with the hydraulic lime. Several old field kilns have been preserved in the forest landscape as prehistoric monuments, showing the model of the local lime burning tradition. This paper discusses the process of identifying the historic lime kiln constructions and their burning technique. It also describes the process of slaking this hydraulic binder in order to produce a lime mortar with workability and compatibility required from a restoration mortar. Newly-produced samples of lime mortar have been compared with historic ones in thin section microscope for further understanding. Key words: lime mortar, slaked lime, lime burning, lime kiln, workability

Glasgow : University of the West of Scotland, 2013
Conference Title:
Conference Title:
3rd Historic Mortars Conference
Conference Venue:
Glasgow, Scotland (UK)
Conference Dates:
2013-09-11 / 2013-09-14
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