Assessment of salt distribution in Maastricht and Migné limestones with the use of micro-destructive techniques

0547453 - ÚTAM 2022 RIV NL eng C - Conference Paper (international conference)
Kyriakou, L. - Aguilar Sanchez, A. M. - Nunes, Cristiana Lara - Ioannou, I.
Assessment of salt distribution in Maastricht and Migné limestones with the use of micro-destructive techniques.
Proceedings of SWBSS 2021. Fifth International conference on salt weathering of buildings and stone sculptures. Delft: TU Delft Open, 2021 - (Lubelli, B.; Kamat, A.; Quist, W.), s. 153-162. ISBN 978-94-6366-439-4.
[International conference on salt weathering of buildings and stone sculptures /5./. Delft (NL), 22.09.2021-24.09.2021]
Institutional support: RVO:68378297
Keywords : salt crystallization * micro-drilling * scratching * μ-XRF * limestone
OECD category: Materials engineering
https://books.bk.tudelft.nl/press/catalog/view/791/901/887-1

The durability of building materials against salt crystallization is currently assessed using standardized and other accelerated weathering laboratory tests. However, these test methods usually do not simulate the performance of a material in practice
realistically. Therefore, they do not always shed enough light on the evaluation of the salt crystallization phenomenon and the prevention of its damaging results. This study focuses on the use of two micro-destructive cutting techniques, based on the measurement of scratching and drilling resistance, to assess salt distribution within Maastricht and Migné limestones, following the procedure developed within the framework of RILEM TC ASC-271 activities for the accumulation of salts. Data collected on freshly quarried reference samples and samples contaminated with NaCl and Na2SO4 are presented. The results, which are entirely in line with complementary μ-XRF measurements, vividly show changes in the microstructure of the salt-contaminated samples. These changes, which are reflected in increased cutting resistance peaks, are consistent in both the scratching and drilling resistance patterns, and they suggest that salts accumulate at or near the evaporation surface of the test specimens, resulting in pore clogging.
Permanent Link: http://hdl.handle.net/11104/0323679