Bio-Stimulated Surface Healing of Historical and Compatible Conservation Mortars

Snežana Vučetić; Damir Čjepa; Bojan Miljević; John Milan van der Bergh; Olja Šovljanski; Ana Tomić; Emilija Nikolić; Siniša Markov; Helena Hiršenberger; Jonjaua Ranogajec

doi:10.3390/ma16020642

Materials (Jan 2023)

Bio-Stimulated Surface Healing of Historical and Compatible Conservation Mortars

Snežana Vučetić,
Damir Čjepa,
Bojan Miljević,
John Milan van der Bergh,
Olja Šovljanski,
Ana Tomić,
Emilija Nikolić,
Siniša Markov,
Helena Hiršenberger,
Jonjaua Ranogajec

Affiliations

Snežana Vučetić: University of Novi Sad, Laboratory for Materials in Cultural Heritage, Faculty of Technology, Bulevar Cara Lazara 1, 21000 Novi Sad, Serbia
Damir Čjepa: La Farge Serbia, Holcim Group, Trg Beocinske Fabrike Cementa 1, 21300 Beočin, Serbia
Bojan Miljević: University of Novi Sad, Laboratory for Materials in Cultural Heritage, Faculty of Technology, Bulevar Cara Lazara 1, 21000 Novi Sad, Serbia
John Milan van der Bergh: University of Novi Sad, Laboratory for Materials in Cultural Heritage, Faculty of Technology, Bulevar Cara Lazara 1, 21000 Novi Sad, Serbia
Olja Šovljanski: University of Novi Sad, Laboratory for Materials in Cultural Heritage, Faculty of Technology, Bulevar Cara Lazara 1, 21000 Novi Sad, Serbia
Ana Tomić: University of Novi Sad, Laboratory for Materials in Cultural Heritage, Faculty of Technology, Bulevar Cara Lazara 1, 21000 Novi Sad, Serbia
Emilija Nikolić: Institute of Archaeology, Kneza Mihaila 35/IV, 11000 Belgrade, Serbia
Siniša Markov: University of Novi Sad, Laboratory for Materials in Cultural Heritage, Faculty of Technology, Bulevar Cara Lazara 1, 21000 Novi Sad, Serbia
Helena Hiršenberger: FEFA Faculty, Metropolitan University, Bulevar Zorana Djindjića 44, 11070 Belgrade, Serbia
Jonjaua Ranogajec: University of Novi Sad, Laboratory for Materials in Cultural Heritage, Faculty of Technology, Bulevar Cara Lazara 1, 21000 Novi Sad, Serbia

DOI: https://doi.org/10.3390/ma16020642
Journal volume & issue: Vol. 16, no. 2
p. 642

Abstract

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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. Special 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.

Published in Materials

ISSN: 1996-1944 (Online)
Publisher: MDPI AG
Country of publisher: Switzerland
LCC subjects: Technology: Electrical engineering. Electronics. Nuclear engineering; Technology: Engineering (General). Civil engineering (General); Science: Natural history (General): Microscopy; Science: Physics: Descriptive and experimental mechanics
Website: http://www.mdpi.com/journal/materials/

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