Utilization of X-ray computed micro-tomography to evaluate iron sulphide distribution in roofing slates

0486977 - ÚGN 2019 RIV GB eng J - Journal Article
Vavro, Martin - Souček, Kamil - Daněk, T. - Matýsek, D. - Georgiovská, Lucie - Zajícová, Vendula
Utilization of X-ray computed micro-tomography to evaluate iron sulphide distribution in roofing slates.
Quarterly Journal of Engineering Geology and Hydrogeology. Roč. 51, č. 2 (2018), s. 169-178. ISSN 1470-9236. E-ISSN 2041-4803
R&D Projects: GA MŠMT(CZ) LO1406
Institutional support: RVO:68145535
Keywords : roofing slate * iron sulphides * X-ray CT * slate pathologies * dimension stone
OECD category: Civil engineering
Impact factor: 1.171, year: 2018
https://qjegh.lyellcollection.org/content/51/2/169

Slate is a traditional stone product that has long been used for roofing widely around the world. The presence of iron
sulphides is one of the most significant factors affecting roofing slate resistance to weathering and, therefore, the quality of
slates and their use in construction. Iron sulphide oxidation is the main process of roofing slate degradation. Qualitative and
quantitative analyses to determine iron sulphides in roofing slates are usually conducted using transmitted and reflected light
microscopy, and X-ray diffraction techniques. However, this paper presents X-ray computed micro-tomography as a new
laboratory method in this field, which also allows for 3D visualization and analysis of iron sulphide distribution in roofing
slates. It also discusses some technical limits of this technique and tomographic scan interpretation pitfalls. The results obtained
by tomographic observations were subsequently verified by optical microscopy, X-ray powder diffraction and scanning
electron microscopy, as well as energy-dispersive X-ray spectroscopy analyses. Spanish slate from the Ordovician Luarca
Formation and Culm slate from the Moravice Formation in the Czech Republic are both characterized by low to extremely low
iron sulphide content, and for this reason were selected for this study.
Permanent Link: http://hdl.handle.net/11104/0281684