Determination of the deliquesce point in double salts and in in-situ multicomponent salts with DVS equipment

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Abstract

Accelerated salt induced deterioration occurs by frequently changes across the deliquescence point. Therefore does the actual deliquescence point of the present salts have a major impact on preventive conservation being able to ensure a relative humidity not causing salt phase transition and to in-situ desalination as dissolution of the salts is the essential criterion to enable transport of salt (ions) in the construction.
In the present work deliquescence points were measured with dynamic vapor sorption (DVS) equipment in salt mixtures and the results are shown to be in agreement with values from the literature. Also in-situ-multi salt samples were measured including the difference between the second critical relative humidity and the efflorescence relative humidity being a measure for the critical supersaturation required for crystallization at the specific experimental conditions. The DVS equipment seems to be able to make accurate determinations of the deliquescence points in complex salt systems and could be an expressive determination in in-situ investigations.
Original languageEnglish
Title of host publicationProceedings of the 3rd International Conference on Salt Weathering of Buildings and Stone Sculptures
PublisherKIK-IRPA
Publication date2014
Pages223-236
Publication statusPublished - 2014
Event3rd International Conference on Salt Weathering of Buildings and Stone Sculptures - Royal Institute for Cultural Heritage (KIK-IRPA), Brussels, Belgium
Duration: 14 Oct 201416 Oct 2014
Conference number: 3

Conference

Conference3rd International Conference on Salt Weathering of Buildings and Stone Sculptures
Number3
LocationRoyal Institute for Cultural Heritage (KIK-IRPA)
Country/TerritoryBelgium
CityBrussels
Period14/10/201416/10/2014

Keywords

  • Deliquescence point
  • Salt mixtures
  • Second critical relative humidity
  • Efflorescence relative humidity
  • DVS
  • Critical supersaturation

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