E-Publication DOI

Electrochemical Desalination of Historic Portuguese Tiles, Azulejos, in laboratory scale

Ottosen, L. M.; Ferreira, C.; Christensen, I. V.

Jahr: 2011

Datei zum Herunterladen: PDF (10 pages, 1.22 MB)

Beschreibung:
Soluble salts causes decay of historic Portuguese tiles. Treatment options for removal of thesalts are few. The present paper deals with development of a method for electrokineticdesalination, where an electric DC field is applied. Experiments are conducted with XVIIIcentury tiles with and without mortar from the tile bed. The focus is on removal of salts overinterphases between glaze/biscuit and biscuit/mortar. As received, the tiles had NaCl crystalsunder loosened glaze, whereas after treatment no salt crystals were found (by SEM-EDX).Desalination of the mortar occurred before biscuit desalination as little chloride and nitratewas removed from the latter, whereas the concentrations were significantly reduced in themortar. This might be linked to the interface between biscuit and mortar, where poor contactand cracks with air could be the reason (the mortar was very loose), hindering the current inpassing. This is a point for further investigation.

Zitation:
Ottosen, L. M.; Ferreira, C.; Christensen, I. V.:
Electrochemical Desalination of Historic Portuguese Tiles, Azulejos, in laboratory scale. University of Cyprus, Department of Civil and Environmental Engineering, Building Materials & Ledra Laboratories 2011
doi:10.5165/hawk-hhg/saltwiki/39