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Friday, May 17 • 4:00pm - 4:30pm
(Research & Technical Studies) Biological Mortar Application for Micro-Crack Remediation in Travertines of Historic Monuments

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Traditional conservation methods for the preservation of historical stones including applications with inorganic and organic polymers are often inadequate and results in introduction of new deterioration problems to historic structures. At this point, consolidating a stone by re-creating a structure similar to original microstructure of stone is a new approach developed to ensure the maximum compatibility by comparison to the traditional conservation techniques. In this study it was aimed to develop a sustainable and an eco-friendly repair material, biological mortar (BM)/infill, to be used in conservation interventions for healing micro-cracks (1 mm) in travertines of historical monuments. This new repair material contains an environmental strain of a known bacteria species. In this context, bacterial isolation and identification were carried out from thermal spring water resources in Pamukkale Travertines (Denizli). Bacillus cereus, already known to have high calcite production capacity, was selected for BM development studies within isolated strains. Upon specifying all components of BM in details, mortar set up was performed in defined proportions and applied to micro-cracks of artificially aged test stones. Performance of this repair material was examined through physical, physico-mechanical, microstructural, and morphological analyses. Consequently, a strong bond between the grains and matrix of BM was determined in relation with the calcite production activities of B. cereus. Moreover, in all samples where BM applications were performed, interface of biological mortar and original material showed continuous and coherent structure. Hence, biological mortar and production substructure developed in this study, could be used for remediation of micro-cracks and micro-voids in historical travertine structures such as sculptures, ornaments, figures, capitals, and elements. In future studies, to increase the rate and concentration of bacterial calcite precipitation in mortar, some parameters in the experimental procedure could be improved by adding specific enzymes or macromolecules having potential to induce nitrogen cycle pathways to the nutritive medium, using large fermenters that could yield high quantities of bacteria, using multiple bacterial assembles that might also increase the amount of calcite production and identifying genes related with the mineral production process and with the adjustment of these genes to bring out large quantities of macromolecules that might induce calcite precipitation.

avatar for Elif Sırt Çıplak

Elif Sırt Çıplak

Dr., Middle East Technical University
In 2009, I started MSc program of Biological Sciences in (METU) (Ankara/Turkey) and completed the program with a thesis titled as “Evaluation of Biodeterioration in Nemrut Mount Monument and Temple of Augustus by Using Various Techniques”. Then, I have decided to pursue the goal... Read More →

avatar for K. Goze Akoglu

K. Goze Akoglu

Associate Research Scientist, Yale Institute for the Preservation of Cultural Heritage (IPCH) Sustainable Conservation Laboratory
Dr. Akoglu is currently Associate Research Scientist at the Yale Institute for the Preservation of Cultural Heritage (IPCH) Sustainable Conservation Laboratory (SCL) as a conservation scientist dedicated to building materials conservation with a solid interdisciplinary scientific... Read More →
avatar for Kivanc Bilecen

Kivanc Bilecen

Assoc. Prof. Dr. /Head of Molecular Biology and Genetics Department, Konya Food and Agriculture University
Dr. Bilecen has received his B.Sc. in Biological Sciences from the Middle East Technical University, his M.Sc. degree in Bioinformatics and Bioengineering from Sabanci University, and his Ph.D. in Microbiology and Environmental Toxicology from the University of California Santa Cruz... Read More →

Neriman Sahin Guchan

Prof. Dr., Middle East Technical University
Joining the academic staff of the Graduate Program in Conservation of Cultural Heritage, METU Department of Architecture in 1984, Neriman Şahin Güçhan curretly works as an professor at the same department. She particularly contributes to education on the issue of historic site... Read More →

  Specialty Session, Research & Technical Studies
  • Track Research & Technical Studies
  • Ticketed Included in Main Registration
  • Authors in Publication Order Dr. Elif Sirt Ciplak (Author), Dr. K. Goze Akoglu (Co-Author), Assoc. Prof. Dr. Kivanc Bilecen (Co-Author), Prof. Dr. Neriman Sahin Guchan (Co-Author)
  • Abstract ID 18830
  • Tags calcite,bacteria,micro-crack,biological mortar,conservation,travertine