Porous materials that contain salts can be permanently exposed to dissolution/deliquescencedrying cycles. Here we report that the mechanisms of salt precipitation are the key factors that determine the drying behaviour of salt contaminated porous materials and the physical weathering generated by salt precipitation. We present macroscopic and microscopic scale experiments, using magnetic resonance imaging, phase contrast microscopy, and X-ray tomography, assessing the impact of the recrystallization dynamics of NaCl and Na2SO4 on evaporation and damage observed in sandstone. When the same amount of water is used to dissolve the salt present in a stone, depending on whether this is done by a rapid saturation with liquid water or by a slow deliquescence using water vapor, different evaporation kinetics and salt weathering due to different crystallization pathways are observed.

Julie Desarnaud, Hannelore Derluyn, Lisa Grementieri, Luisa Molari, Stefano de Miranda, Veerle Cnudde, et al. (2016). Salt contaminated sandstone under environmental loading: recrystallization process and its consequences.

Salt contaminated sandstone under environmental loading: recrystallization process and its consequences

GREMENTIERI, LISA;MOLARI, LUISA;DE MIRANDA, STEFANO;
2016

Abstract

Porous materials that contain salts can be permanently exposed to dissolution/deliquescencedrying cycles. Here we report that the mechanisms of salt precipitation are the key factors that determine the drying behaviour of salt contaminated porous materials and the physical weathering generated by salt precipitation. We present macroscopic and microscopic scale experiments, using magnetic resonance imaging, phase contrast microscopy, and X-ray tomography, assessing the impact of the recrystallization dynamics of NaCl and Na2SO4 on evaporation and damage observed in sandstone. When the same amount of water is used to dissolve the salt present in a stone, depending on whether this is done by a rapid saturation with liquid water or by a slow deliquescence using water vapor, different evaporation kinetics and salt weathering due to different crystallization pathways are observed.
2016
Proceedings of the International RILEM Conference Materials, Systems and Structures in Civil Engineering 2016, Segment on Historical Masonry
127
136
Julie Desarnaud, Hannelore Derluyn, Lisa Grementieri, Luisa Molari, Stefano de Miranda, Veerle Cnudde, et al. (2016). Salt contaminated sandstone under environmental loading: recrystallization process and its consequences.
Julie Desarnaud; Hannelore Derluyn; Lisa Grementieri; Luisa Molari; Stefano de Miranda; Veerle Cnudde; Noushine Shahidzadeh
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/588415
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