Bioconsolidación de materiales pétreos y ornamentales mediante carbonatogénesis bacteriana
- María Teresa González-Muñoz
- Fadwa Jroundi
- Ana García-Bueno
- Beatriz Martín Peinado
- Carlos Rodríguez-Navarro
Publisher: Ministerio de Cultura
Year of publication: 2015
Volume Title: La Ciencia y el Arte V. Ciencias experimentales y conservación del patrimonio
Volume: 5
Pages: 80-101
Type: Book chapter
Abstract
The observed limitations of conventional stone consolidants has led to the search of more effective conservation methods. Here we show that bacterial calcium carbonate mineralization induced by the in situ application of a nutritional solution that selectively activates the carbonatogenic microbiota present in decayed stone is a highly effective consolidation method. We show that the treatment increases the mechanical resistance of the stone without altering its color. Furthermore, no deleterious microbiota is activated: all culturable bacteria are carbonatogenic, no nitrifying or sulfoxidant bacteria are detected, and the number of fungi spores remains constant or decreases. Results of bacterial consolidation of gypsum plasters with and without polychromy are presented also, and compared with the results of the application of conventional consolidants such as mowital, paraloid B72 and ethyl silicate. We show that, as in the case of stone, the bacterial treatment is the most effective and neither plugs the pores nor it alters the plaster color.