10.5165/HAWK-HHG/SALTWIKI/29
Desarnaud, J.
J.
Desarnaud
Bertrand, F.
F.
Bertrand
Shahidzadeh-Bonn, N.
N.
Shahidzadeh-Bonn
Dynamics of salt crystallization
University of Cyprus, Department of Civil and Environmental Engineering, Building Materials & Ledra Laboratories
2011
Conference paper
Conservation science
HAWK Hildesheim/Holzminden/Göttingen, Hornemann Institut
Hornemann Institut
HAWK Hildesheim/Holzminden/Göttingen
2011
en
http://www.saltwiki.net/index.php?title=SWBSS2011&oldid=2960
978-9963-7355-1-13
10 pages
0.86 MB
PDF
We study the impact of the recrystallization dynamics on damage of sandstone duringwetting/drying and humidity cycling for NaCl and compare with the case of Na2SO4. Theseresults reveal the major role of the crystallization dynamics in the way different salts causedamage under different environmental conditions. For sodium chloride, damage on PragueSandstone is found to occur rather during humidity cycling than rewetting/ drying cycles. Weshow for the first time that deliquescence/recrystallization with humidity cycling leads to thegrowth of salt crystals by expulsing impurities in a process akin to the zone refining used in thesemiconductor industry to obtain high-quality single crystals. The consequence of that is thefaster growth of less nuclei with the progression of cycles leading to larger crystals and highersupersaturations before nucleation. This in turn leads to a higher crystallization pressure andhence more damage.