Experimental research on salt contamination procedures and methods for assessment of the salt distribution

0543179 - ÚTAM 2022 RIV GB eng J - Journal Article
Nunes, Cristiana Lara - Aguilar Sanchez, A. M. - Godts, S. - Gulotta, D. - Ioannou, I. - Lubelli, B. - Menéndez, B. - Shahidzadeh, N. - Slížková, Zuzana - Theodoridou, M.
Experimental research on salt contamination procedures and methods for assessment of the salt distribution.
Construction and Building Materials. Roč. 298, September (2021), č. článku 123862. ISSN 0950-0618. E-ISSN 1879-0526
Grant - others:AV ČR(CZ) StrategieAV21/23
Program: StrategieAV
Institutional support: RVO:68378297
Keywords : salt crystallisation test * porous materials * salt accumulation * salt distribution
OECD category: Materials engineering
Impact factor: 7.693, year: 2021
Method of publishing: Limited access
https://doi.org/10.1016/j.conbuildmat.2021.123862

The RILEM TC ASC-271 is developing a new laboratory test to assess the durability of porous building materials to salt crystallisation. The test encompasses two phases: salt accumulation and damage propagation. This paper focuses on designing a procedure for the accumulation phase - this is considered successful when salts crystallise at the material's evaporative surface (common situation observed on site) without the occurrence of damage. Two procedures were developed and tested on two limestones with different porosity: capillary absorption of a salt solution followed by drying, and continuous capillary absorption. Sodium chloride or sodium sulphate solutions were used. Several methods for assessing the salt distribution were employed: ultrasonic pulse velocity, drilling/scratching resistance, hygroscopic moisture content, ion chromatography, scanning electron microscopy, and micro X-ray fluorescence. The results enabled the selection of the most effective protocol for the salt accumulation phase.
Permanent Link: http://hdl.handle.net/11104/0320451