Читать книгу Monument Future - Siegfried Siegesmund - Страница 193

The Zvartnots Cathedral was built from basalts and tuffs in the 7th century. Since the year 2000, it has been listed on the UNESCO World Heritage list. The Avan Cathedral is even older and was built in the 6th century, mainly from tuff. Both monuments are now ruins and have been restored several times with different materials. This applies primarily to the restoration mortar used.

The tuff material used for both cathedral ruins is comparable.While damage to Avan Cathedral is dominated by cracks and static problems, the Zvartnots ruin is primarily damaged by widespread salt contamination.

In this study, the restoration history of both cathedral ruins were worked out and the petro-physical properties of the building stones were investigated. The historical and modern mortars used in both structures were analysed and examined in the laboratory. Onsite object investigations were carried out, which includes damage mapping, surface hardness, electrical conductivity and the sampling of salts. The investigation clarify the high quality and weathering resistance of the historical mortars.