Mitigating salt damage in lime-based mortars with mixed-in crystallization modifiers

Sanne Granneman, Barbara Lubelli, Rob van Hees

Research output: Chapter in Book/Conference proceedings/Edited volumeConference contributionScientificpeer-review

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Abstract

This paper presents the most important results of a research project which
focused on the use of crystallization modifiers mixed in lime mortar to mitigate
salt crystallization damage. The research focused on two of the most damaging
salts, sodium chloride and sodium sulfate, and suitable crystallization modifiers (sodium ferrocyanide and borax). We report the major findings related to the effectiveness of the modifiers when mixed in the mortar, and the results of characterization of the additivated mortars in comparison with reference mortars. Moreover, the durability of the developed mortars to salt decay is discussed, based on the results of an accelerated salt weathering test carried out in laboratory. No major effects of the modifiers on the fresh and hardened mortar properties were observed which might restrain the application of crystallization modifiers in restoration mortars. Additionally, the mortars with mixed-in modifiers showed a considerable improvement of the salt resistance when compared to reference mortars. Considering these results an outlook for future research pathways is given.
Original languageEnglish
Title of host publicationProceedings of SWBSS 2017
Subtitle of host publicationFourth International Conference on Salt Weathering of Buildings and Stone Sculptures
EditorsS. Laue
PublisherFachhochschule Potsdam
Pages100-107
ISBN (Print)978-3-934329-88-1
Publication statusPublished - 2017
EventSWBSS 2017: 4th International Conference on Salt Weathering of Buildings and Stone Sculptures - Potsdam, Germany
Duration: 20 Sep 201722 Sep 2017

Publication series

NamePotsdamer Beiträge zur Konservierung und Restaurierung
Volume6

Conference

ConferenceSWBSS 2017: 4th International Conference on Salt Weathering of Buildings and Stone Sculptures
CountryGermany
CityPotsdam
Period20/09/1722/09/17

Keywords

  • crystallization modifiers
  • self-healing
  • lime mortar

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