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Bio-Stimulated Surface Healing of Historical and Compatible Conservation Mortars

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2023
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Authors
Vučetić, Snežana
Čjepa, Damir
Miljević, Bojan
van der Bergh, John Milan
Šovljanski, Olja
Tomić, Ana
Nikolić, Emilija
Markov, Siniša
Hiršenberger, Helena
Ranogajec, Jonjaua
Article (Published version)
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Abstract
The main focus of this research was the bio-stimulated healing of cracks in lime mortar samples (historical and newly designed). The investigation started from comprehensive characterisation of historical mortars, while in the next stage a compatible conservation mortar was designed and characterised, with special attention given to the contact zone formation between original and conservation mortars. The next step was the design of a bio-stimulating crack-sealing agent, a two-component liquid system: bacteria culture Sporosarcina pasteurii DSM 33 and nutrients. Both historical and conservation mortar samples were used in order to study their potentials for bio-stimulated surface-crack repair. The experiment lasted for 150 days, allowing the ureolytic bacteria Sporosarcina pasteurii DSM 33 to induce the precipitation of calcium carbonate into cracks and heal the damaged surface of the tested materials. The healing phenomenon was continuously monitored during a period of 150 days. Speci...al attention was given to the evaluation of the morphology, chemical and structural characteristics of the deposits created in/on the surface cracks, monitored by optical microscopy, SEM, XRF and XRD analyses. The obtained results present valuable input for the application of the developed system in real environmental conditions as a solution for the future sustainable architectural conservation of traditionally prepared mortars.

Keywords:
bio-stimulated healing / lime mortar conservation / compatible mortars / precipitation into cracks / microbiologically induced calcium carbonate precipitation (MICP)
Source:
Materials, 2023, 16, 2, 642-
Publisher:
  • MDPI
Funding / projects:
  • MoDeCo2000 - Mortar Design for Conservation - Danube Roman Frontier 2000 Years After (RS-6067004)
  • Ministry of Education, Science and Technological Development, Republic of Serbia, Grant no. 200134 (University of Novi Sad, Faculty of Technology) (RS-200134)
  • PN-III-P3-3.5-EUK2019-0196 Eureka! 13085 CAPTAN

DOI: https://doi.org/10.3390/ma16020642

ISSN: 1996-1944

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URI
http://rai.ai.ac.rs/handle/123456789/496
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Археолошки институт / Institute of Archaeology

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