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Weathering behaviour and construction suitability of dimension stones from the Drei Gleichen area (Thuringia, Germany)

Stück, Heidrun
Siegesmund, Siegfried
Rüdrich, Jörg
Journal: Environmental Earth Sciences; 637/8; 2011; p. 1763 - 1786
DOI: https://doi.org/10.1007/s12665-011-1043-7
Stück, Heidrun; Siegesmund, Siegfried; Rüdrich, Jörg, 2011: Weathering behaviour and construction suitability of dimension stones from the Drei Gleichen area (Thuringia, Germany). In: Environmental Earth Sciences, Band 63, 1763 - 1786, DOI 10.1007/s12665-011-1043-7.
 
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  • Abstract
The construction suitability of a dimension stone depends on its weathering properties along with the petrology and the petrophysical properties. The aim of this study was to evaluate the suitability of the dimension stones from the “Drei Gleichen” area for construction and replacement purposes. In total, six sandstones (Ingersleben, Wachsenburg, Hindfelden, Seeberg, Röhnberg, Gleichenberg; Upper Triassic) as well as two carbonates (Wachsenburg sinter; Quaternary, Wandersleben dolomite; Middle Triassic) were analysed. The results from our laboratory and on-site studies of the dimension stones show that rocks from the same stratigraphic layer, like the sandstones from the upper Triassic, can show major differences in their petrophysical and weathering properties. These differences are attributed to their different diagenesis, resulting, e.g. in varying pore space, water balance and strength properties. The pore size distribution can be divided into four different groups based on their occurring maxima and micropore content. The determined water balance properties as well as moisture expansion and salt attack depend on these groups. Next to this, the mineralogical composition significantly influences the weathering resistance. Sandstones with a high content of altered lithoclasts show a high amount of moisture expansion, low strength and, in consequence, a low weathering resistance against salt attack. Based on the results of the present study, an evaluation of construction suitability could be accomplished. From the analysed sandstones, only the Seebergen sandstone is suitable for construction purposes due to its good availability, good strength properties (high compressive and tensile strength, low softening degree) as well as a low porosity. Furthermore, the Wachsenburg sandstone also shows good petrophysical and petrological properties, but exploitable deposits are too sparse to be of commercial interest. From the carbonates, the Wachsenburg sinter shows very suitable rock parameters, but only sparse outcrops occur, which are not appropriate for mining.
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