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1 Przegląd Archeologiczny

1 2006

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Application of Petrographical Comparative Analysis in Dating of Spatial Development of the Wlen Castle

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Busko C. , Michniewicz J.

Przegląd Archeologiczny

2006

tom 54

183-211

The paper aims to present the results of petrographic and chemical analysis of mortars revealed during the archaeological investigation at the Wlen Castle. The castle was erected and then developed from the early Middle Ages to the Renaissance. Some restoration works were carried out at the castle ruins as well at the end of the 19th century. The objective of the analysis was to establish the chronological differences between individual parts of the castle and to reconstruct approximate mortar formulas necessary in restoration. Microscopic methods, granulometric analysis and chemical analysis were used in the investigation. The achieved results allowed to correlate 55 from 80 taken mortar samples, which were ascribed to six groups diversified with respect to the petrographic composition of the aggregate. Moreover six sub-groups were distinguished on the basis of the differences in the carbonate binder content, colour, texture and mechanical properties. The mortars at the Wlen Castle are mostly lime and sometimes clay-sand-lime materials. The reconstructed formulas showed particular dissimilarity of the mortars taken from the walls of a Romanesque church displaying a higher amount of used lime.