10.5165/HAWK-HHG/SALTWIKI/38
Mosquera, M. J.
M. J.
Mosquera
De Los Santos, D. M.
D. M.
De Los Santos
Resistance to salt crystallization provided by a new surfactantsynthesized ormosil applied in monumental stone restoration
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=2969
978-9963-7355-1-22
10 pages
0.78 MB
PDF
Most commercial stone restoration products contain tetraethoxysilane (TEOS). A well-known drawbackof these materials is their tendency to form gels susceptible to cracking, which is generated by the highcapillary pressures supported during drying. We have synthesized a new nanomaterial by adding ahydroxyl-terminated polydimethylsiloxane (PDMS) to TEOS in the presence of the surfactant, noctylamine.The surfactant acts to direct the gel network pore structure; the coarsening of the gel networkthen reduces the capillary pressure responsible for cracking. In addition, methyl groups from the PDMSgive hydrophobic properties to the product. In the study reported, we evaluate the durability of abiocalcareous sandstone and a granite treated with the new material by applying a sodium chloridecrystallization test. Results obtained show that our product increases the resistance of the stone to thesodium chloride crystallization cycles as a consequence of the combined action of the consolidating andhydrophobic properties of the new nanomaterial.