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Międzynarodowa konferencja ekspertów na temat wietrzenia kamienia - Bruksela 11-14 grudnia 1968

100%

Lehmann J.

Ochrona Zabytków

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1969

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issue 2

155-158

2

Zagadnienie soli rozpuszczalnych w wodzie w procesie niszczenia i konserwacji zabytków kamiennych

88%

Lehmann J.

Ochrona Zabytków

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1970

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issue 1

47-50

EN

In the recent preservation and research works a good deal of attention has been paid to the salting of objects the state of which deteriorates with the accelerated weathering. As the cause of salting may be quoted preservation processes carried out with application of media containing or producing water-soluble salts, and also the moistening of objects, further the action of biological factors, and the air contamination by combustion gases. The mechanism of stone destruction by water-soluble salts consists in solving of its components in basic or acidic products of salt hydrolisis and in the blowing action of hydratating or crystallizing salts in which the actions an important part is being played by hygroscopic properties possessed by the salts themselves. Thus, the preservation of historical monuments endangered with destruction in effect of their salting should, above the all, comprise the revealing and removing the causes of their salting, the salt extraction, and finally, where necessary, their consolidation.

3

Rzeźba św. Jana Nepomucena z Placu Trzech Krzyży w Warszawie : interpretacja zmian wietrzeniowych na podstawie poszerzonych badań konserwatorskich

75%

Procyk W.

Ochrona Zabytków

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2000

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issue 2

142-152

EN

The presented article focuses interest on analyses and an attempted interpretation of changes observed within an eighteenth-century statue made of domestic sandstone. This material could serve as a basis for a scheme of conservation documentation. The intention of the author is to illustrate and explain certain phenomena occurring in the course of work on the object. Scanning and analyses of thin cuts disclosed the specificity of the location and origin of airtight build-up complexes. Computer analysis and a comparison of diagrams of spectra contained in diffraction patterns, which could cast light on eventual differences between the composition, indicated an identical shape of the “peaks”, i. e. similar mineral composition. A rare granular disintegration of quartz grains was discovered in the course of examining the weathered structures of the statue in Trzech Krzyży Square in polarised light. This factor could have exerted an impact on, i. a. considerable effective porosity and increased absorptivity, also recognised in the context. As a consequence, the range was expanded by including the effects of conservation. In the current situation, when financial funds suffice only for intervention, research remains limited. The packet of studies applied in the course of work, constrained in a routine- like manner, will never explain all the problems. The possibility of a macroscopic observation of the outcome of the phenomena, which cannot be interpreted to the very end, provides mistaken results in the assessment of the progress made by destructive processes. The conclusions are obvious.

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3 Ochrona Zabytków

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2 Lehmann J.

1 Procyk W.

Międzynarodowa konferencja ekspertów na temat wietrzenia kamienia - Bruksela 11-14 grudnia 1968

Zagadnienie soli rozpuszczalnych w wodzie w procesie niszczenia i konserwacji zabytków kamiennych

Rzeźba św. Jana Nepomucena z Placu Trzech Krzyży w Warszawie : interpretacja zmian wietrzeniowych na podstawie poszerzonych badań konserwatorskich