Improving salt weathering resistance of hydraulic mortars with an encapsulated crystallisation inhibitor

Research output: ThesisDissertation (TU Delft)

49 Downloads (Pure)

Abstract

Repeated crystallisation of salts in the pores of building materials is a common cause of damage in buildings. Sodium chloride (NaCl) is one of the most common salts, responsible for weathering in the built environment. Mortars, especially when used as plasters and renders on the surface of walls, experience fast degradation as they are exposed to conditions perfectly conducive to salt weathering. As a consequence, their service life is often compromised, requiring frequent replacements. Costs associated with replacement interventions have a high economic and a social impact. Over the last two decades, the use of crystallisation inhibitors as an additive to prevent/mitigate salt crystallisation damage in building materials has shown promising results. Sodium ferrocyanide (NaFeCN), a crystallisation inhibitor of NaCl is particularly effective in preventing damage by inhibiting/delaying NaCl nucleation and altering NaCl’s crystal habit. When mixed-in air lime-based mortars, NaFeCN has been shown to considerably improve the salt weathering resistance....
Original languageEnglish
QualificationDoctor of Philosophy
Awarding Institution
  • Delft University of Technology
Supervisors/Advisors
  • Schlangen, E., Supervisor
  • Lubelli, B., Supervisor
Thesis sponsors
Award date25 Oct 2024
Print ISBNs978-94-6366-936-8
Electronic ISBNs978-94-6366-937-5
DOIs
Publication statusPublished - 2024

Keywords

  • Salt weathering
  • Sodium chloride
  • crystallisation inhibitor
  • hydraulic mortars
  • Chitosan-alginate
  • Controlled release

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