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

Author(s): Julie Desarnaud, Hannelore Derluyn, Lisa Grementieri, Luisa Molari, Stefano de Miranda, Veerle Cnudde, Noushine Shahidzadeh
Paper category: Proceedings
Book title: Proceedings of the International RILEM Conference
Materials, Systems and Structures in Civil Engineering 2016 segment on
Historical Masonry
Editor(s): Inge Rörig-Dalgaard and Ioannis Ioannou
ISBN: 978-2-35158-178-0
e-ISBN: 978-2-35158-179-7
Publisher: RILEM Publications SARL
Publication year: 2016
Pages: 140-149
Total Pages: 10
Language : English

Abstract: Porous materials that contain salts can be permanently exposed to dissolution/deliquescence-
drying 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.

Online publication : 2016
Publication type : full_text
Public price (Euros) : 0.00