A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
The disintegration by spalling of molasses sandstone compared to tuffeau limestone
The development of the phenomena of contour scaling (or spalling) is particularly apparent in molasses sandstone of the alpine basin, but is also well known for the region of the 'Pays de Loire' tuffeau- limestone (France). In this form of degradation the affected areas are not only visually disturbing, but a destabilization of up to several centimetres into the interior of the stone may risk structural damage. The observations at the Lausanne Cathedral confirm a variety of results and reflections from earlier studies about the formation of this degradation type. Depending on the local conditions 2 different types of spalling, the deep or profound spalling and the superficial or surface spalling, are found and should be distinguished. The stages of formation of spalling are also playing a mayor factor in the characterization of the degradation. The comparison of the mineralogical and petrophysical data of the 2 stones, Molasse sandstone and Tuffeau Blanc, as well as their profiles of spalling identifies the general factors that promote the formation of spalling.The intrinsic properties of stones as very high porosity, chemical sensibility due to the high content of carbonates and high hydric expansion favour the formation of spalling in zones exposed to meteorological conditions that promote rapid wet/dry cycles. The localization and characterization of the type of scaling and the stage of formation on the facade of the monument helps to identify the causes and local condition under which the development of the degradation took place. The information of the interactions between the materials and their environment should guide the conservation/ restoration approach.
The disintegration by spalling of molasses sandstone compared to tuffeau limestone
The development of the phenomena of contour scaling (or spalling) is particularly apparent in molasses sandstone of the alpine basin, but is also well known for the region of the 'Pays de Loire' tuffeau- limestone (France). In this form of degradation the affected areas are not only visually disturbing, but a destabilization of up to several centimetres into the interior of the stone may risk structural damage. The observations at the Lausanne Cathedral confirm a variety of results and reflections from earlier studies about the formation of this degradation type. Depending on the local conditions 2 different types of spalling, the deep or profound spalling and the superficial or surface spalling, are found and should be distinguished. The stages of formation of spalling are also playing a mayor factor in the characterization of the degradation. The comparison of the mineralogical and petrophysical data of the 2 stones, Molasse sandstone and Tuffeau Blanc, as well as their profiles of spalling identifies the general factors that promote the formation of spalling.The intrinsic properties of stones as very high porosity, chemical sensibility due to the high content of carbonates and high hydric expansion favour the formation of spalling in zones exposed to meteorological conditions that promote rapid wet/dry cycles. The localization and characterization of the type of scaling and the stage of formation on the facade of the monument helps to identify the causes and local condition under which the development of the degradation took place. The information of the interactions between the materials and their environment should guide the conservation/ restoration approach.
The disintegration by spalling of molasses sandstone compared to tuffeau limestone
Ebersole, S.M. (author) / Rousset, B. (author) / Tomachot, C. (author)
2003
10 Seiten, 2 Bilder, 3 Tabellen, 11 Quellen
Conference paper
German
The Disintegration by Spalling of Molasses Sandstone Compared to Tuffeau Limestone
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