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

0573387 - ÚTAM 2024 RIV DE eng J - Journal Article
Lubelli, B. - Rörig-Daalgard, I. - Aguilar, A. M. - Aškrabić, M. - Beck, K. - Bläuer, C. - Cnudde, V. - D’Altri, A. M. - Derluyn, H. - Desarnaud, J. - Diaz Gonçalves, T. - Flatt, R. - Franzoni, E. - Godts, S. - Gulotta, D. - van Hees, R. - Ioannou, I. - Kamat, A. - de Kock, T. - Menéndez, B. - de Miranda, S. - Nunes, Cristiana Lara - Sassoni, E. - Shahidzadeh, N. - Seidel, H. - Slížková, Zuzana - Stefanidou, M. - Theodoridou, M. - Veiga, R. - Vergès-Belmin, V.
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.
Materials and Structures. Roč. 56, č. 5 (2023), č. článku 101. ISSN 1359-5997. E-ISSN 1871-6873
Institutional support: RVO:68378297
Keywords : recommendation * salt crystallization test * RILEM TC 271-ASC * sodium sulfate * sodium chloride
OECD category: Materials engineering
Impact factor: 3.8, year: 2022
Method of publishing: Open access
https://doi.org/10.1617/s11527-023-02158-0

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 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.
Permanent Link: https://hdl.handle.net/11104/0343848