Читать книгу Monument Future - Siegfried Siegesmund - Страница 118

This study compares two different heat scenarios which are both necessary to investigate fire damages on sandstone objects or monuments.

The realistic fire scenario with the exposure of architectural sandstone elements to a burning wood crib within a fire container for a short time results in damages comparable to those observed on monuments which suffered from fire attack. The temperatures measured on stone surfaces and within the inner core of the objects indicate high gradients, resulting in material tension and subsequent cracking.

In contrast, smaller specimens of the same sandstone materials reveal no cracking even at higher temperatures when gradually heated in a laboratory oven. However, such tests and the respective test specimens which will be further investigated, may also be useful for enlightening the change of petrographic and material properties during heating.