Читать книгу Monument Future - Siegfried Siegesmund - Страница 320

The studied monoliths show diverse, partly exposure-specific weathering forms. Under laboratory 214conditions, the negative effects of thermal and thermohygric expansion were identified and are in accordance with the field observations. Water did show to increase the negative effect of thermal expansion on the investigated sandstones. Also its function as a transport medium has to be taken into account. The in-situ investigation showed severe damages associated with salt crystallization, which could be reproduced under laboratory conditions to a lesser extent. Possible protective measures for the future could be temporary roof constructions during seasons of high solar radiation and temperature or a protective planting of trees, which would be a permanent, but more natural solution. Nevertheless, individual monoliths should be considered for conservational treatment due to the high degree of weathering. Desalination and repairs with stone replacement mortars as well as measures to minimize the future salt input into the stone can be crucial. Regarding the origin of the monolith source material, the data from the in-situ and petrographic investigations, point towards a sandstone layer in the Paja Formation as origin of the sandstones S2 and S3. Therefore, further investigation should concentrate on the residual sandstone boulders covering the Paja Formation in the vicinity of the park.