Title
Optimizing the extraction of Soluble salts from porous materials by poultices
Author
Sawdy, A.
Lubelli, B.
Voronina, V.
Pel, L.
TNO Bouw en Ondergrond
Publication year
2010
Abstract
Poultices are often used to extract salts from salt-deteriorated objects, but the results achieved can be highly variable. Currently, poulticing materials and methodologies are selected empirically, but many variables affect the treatment outcome, so achieving the 'best fit' between available materials, application methods and substrate characteristics is somewhat arbitrary.This research, undertaken during the EC Desalination project (FP6 022114), investigated whether the extraction efficiency of drying poultices can be optimized by adjusting the poultice pore-size distribution to suit that of the substrate. Different substrate / poultice combinations of varying pore-size distributions (determined by nuclear magnetic resonance and mercury intrusion porosimetry) were selected for extraction efficiency tests. The results demonstrated that a prerequisite for efficient salt extraction by a drying poultice is that it has smaller pores than the substrate. However, the residual salt distribution after treatment was independent of the experimental factors tested. Tints, while manipulation of the poultice pore-size distribution can enhance salt extraction, this does not govern the location of residual salts. This study demonstrates that poultices should be adapted to suit the characteristics of the object undergoing treatment. However, the uncontrolled residual salt distribution and potential re-emergence of salt problems mean that the effectiveness of poulticing treatments requires long-term assessment.
Subject
Architecture
After-treatment
Application method
Best fit
Desalination projects
Different substrates
Experimental factors
Extraction efficiencies
Mercury intrusion porosimetry
Residual salts
Salt extraction
Soluble salts
Substrate characteristics
Treatment outcomes
Desalination
Dewatering
Mercury (metal)
Nuclear magnetic resonance spectroscopy
Pore size
Porous materials
Resonance
Salts
Size distribution
Substrates
Water filtration
Extraction
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http://resolver.tudelft.nl/uuid:24a7b2cd-995d-4018-921a-8b9979cfbfbe
TNO identifier
360555
Source
Studies in Conservation, 55 (1), 26-40
Document type
article