Recommendation of RILEM TC 271-ASC: New accelerated test procedure for the assessment of resistance of natural stone and fired-clay brick units against salt crystallization
Lubelli, B.; Rorig-Daalgard, I.; Aguilar, A. M.; Askrabic, M.; Beck, K.; Blauer, C.; Cnudde, V.; D'Altri, A. M.; Derluyn, H.; Desarnaud, J.; Diaz Goncalves, T.; Flatt, R.; Franzoni, E.; Godts, S.; Gulotta, D.; van Hees, R.; Ioannou, I.; Kamat, A.; De Kock, T.; Menendez, B.; de Miranda, S.; Nunes, C.; Sassoni, E.; Shahidzadeh, N.; Siedel, H.; Slizkova, Z.; Stefanidou, M.; Theodoridou, M.; Veiga, R.; Verges-Belmin, V.
(2023) Materials and Structures/Materiaux et Constructions, volume 56, issue 5, pp. 1 - 12
(Article)
Abstract
This recommendation is devoted to testing the resistance of natural stone and fired-clay brick units against salt crystallization. The procedure was developed by the RILEM TC 271-ASC to evaluate the durability of porous building materials against salt crystallization through a laboratory method that allows for accelerated testing without compromising the
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reliability of the results. The new procedure is designed to replicate salt damage caused by crystallization near the surface of materials as a result of capillary transport and evaporation. A new approach is proposed that considers the presence of two stages in the salt crystallization test. In the first, the accumulation stage, salts gradually accumulate on or near the surface of the material due to evaporation. In the second, the propagation stage, damage initiates and develops due to changes in moisture content and relative humidity that trigger salt dissolution and crystallization cycles. To achieve this, two types of salt were tested, namely sodium chloride and sodium sulphate, with each salt tested separately. A methodology for assessing the salt-induced damage is proposed, which includes visual and photographical observations and measurement of material loss. The procedure has been preliminarily validated in round robin tests.
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Keywords: RILEM TC 271-ASC, Recommendation, Salt crystallization test, Sodium chloride, Sodium sulfate, Mechanics of Materials, General Materials Science, Building and Construction, Civil and Structural Engineering
ISSN: 1359-5997
Publisher: Springer Netherlands
Note: Funding Information: The procedure presented in this paper is the final version developed by the RILEM TC 271-ASC. The TC has previously published draft versions of (part of) the procedure [1, 2]. H. Derluyn acknowledges support from the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation programme (grant agreement No 850853)”. Publisher Copyright: © 2023, The Author(s).
(Peer reviewed)
