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Konserwacja kamiennego detalu architektonicznego Zamku na Wawelu : prace w latach 1984-1986

100%

Stępień P.

1987

nr 4

304-312

The article presents conservation work done on a stone architectonic detail in the Castle at the Wawel Hill carried out in 1984-1986 by the team headed by the author and operating within the Management for the Renewal of the Royal Castle at the Wawel Hill (at present a branch office of the PP PKZ). The work was preceded with a detail examination of the laboratory studies made by the Centre for the Studies on the History of Engineering at the Higher Mining School (A.G.H.) in Cracow. The destruction of a stone architectonic detail of the Castle, made from poorly weather-proof sandstone and limestone, is caused mainly by chemical corrosion (sulphur compounds and other gas pollution of the atmosphere) combined with atmospheric humidity. At the same time a high dust fall brings about strong soiling and results in blocking stone pores. The basic conservation treatment includes: removal of the "sheir of layers, consolidation of impaired material and protection against hydrophobization. The work done in the Wawel Castle in the discussed period compromised the preservation of stone elements in the Senatorial Stairs, part of the portals and window framings in the Arcade Courtyard as well as the west elevation of a gate wing. Organic silicone preparations both imported (Steinfestiger OH and Steinfestiger H made by Wacker- -Chemie) and Polish ones (Ahydrosil Z elaborated by the Institute of Industrial Chemistry in Warsaw) were used for the consolidation and hydrophobization. A very poor condition of the preserved parts called for a special treatment consisting, i.a., in preparatory stregthening of the stone prior to cleansing, injections, protection of stratifications with strips of putty, addition of acrylic resin to consolidating preparations (because of stratifications and crackings). Solutions of ammonium, carbonate and alcalic pastes that act mildly but effectively were amongst the products used for cleansing. The missing parts were mostly made up with lime stone putty and only in some exceptional cases with putty made from stone dust based on acrylic resin.