Effect Of Alkali Ferrocyanides On Crystallisation Of Sodium Chloride: Preliminary results

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Abstract

Sodium chloride (NaCl) is one of the ubiquitous soluble salts in the environment and is responsible for weathering of building materials. The salt weathering is attributed to the stress developed from crystallisation of these salts in pores of the building materials, with supersaturation as the driving force. In the last years, researchers have successfully mitigated the damage associated with the crystallisa-tion of NaCl by the use of alkali-ferrocyanides (crystallisation inhibitors) in porous building materials. The observed mitigation of the damage has been attributed to lowering of the crystallisation pressure, possibly related to changes in the crystal habit and preferential crystallisation of the salt in the form of efflorescence instead of crypto-florescence. However, the effect of the inhibitor on the development of the so-called crystallisation pressure has not been studied in detail yet. In fact, direct measurement of this pressure is challenging and, until now, only a few experiments have been successful. In this research, an experimental setup has been developed to directly measure the crystallisation forces of NaCl and the effect of fer-rocyanide on these, while visualizing the crystallization process under a microscope. Some preliminary tests using this setup have been carried out: these consisted in monitoring force evolution from a drop of solution with and without the inhibitor confined between two glass plates.
Original languageEnglish
Title of host publicationProceedings of the SWBSS
Subtitle of host publicationFifth International Conference on Salt Weathering of Buildings and Stone Sculptures
EditorsBarbara Lubelli , Ameya Kamat, Wido Quist
PublisherTU Delft Open
Pages109-118
Number of pages10
ISBN (Electronic)978-94-6366-439-4
Publication statusPublished - 2021
Event5th International Conference on Salt Weathering of Buildings and Stone Sculptures - Faculty of Architecture and the Built Environment, Delft, Netherlands
Duration: 22 Sep 202124 Sep 2021
Conference number: 5
https://www.tudelft.nl/en/architecture-and-the-built-environment/current/events/swbss-2021

Conference

Conference5th International Conference on Salt Weathering of Buildings and Stone Sculptures
Abbreviated titleSWBSS2021
CountryNetherlands
CityDelft
Period22/09/2124/09/21
Internet address

Keywords

  • Crystallisation pressure
  • direct measurement
  • sodium chloride
  • sodium ferrocyanide
  • 3D microscopy

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