Please use this identifier to cite or link to this item: https://www.um.edu.mt/library/oar/handle/123456789/18335
Title: Biocalcifying Bacillus subtilis cells effectively consolidate deteriorated Globigerina limestone
Authors: Micallef, Roderick
Vella, Daniel
Sinagra, Emmanuel
Zammit, Gabrielle
Keywords: Bacillus subtilis
Calcification
Limestone
Calcite
Issue Date: 2016-07
Publisher: Springer Berlin Heidelberg
Citation: Micallef, R., Vella, D., Sinagra, E., & Zammit, G. (2016). Biocalcifying Bacillus subtilis cells effectively consolidate deteriorated Globigerina limestone. Journal of Industrial Microbiology & Biotechnology, 43(7), 941-952.
Abstract: Microbially induced calcite precipitation occurs naturally on ancient limestone surfaces in Maltese hypogea. We exploited this phenomenon and treated deteriorated limestone with biocalcifying bacteria. The limestone was subjected to various mechanical and physical tests to present a statistically robust data set to prove that treatment was indeed effective. Bacillus subtilis conferred uniform bioconsolidation to a depth of 30 mm. Drilling resistance values were similar to those obtained for freshly quarried limestone (9 N) and increased up to 15 N. Treatment resulted in a high resistance to salt deterioration and a slow rate of water absorption. The overall percentage porosity of treated limestone varied by ±6 %, thus the pore network was preserved. We report an eco-friendly treatment that closely resembles the mineral composition of limestone and that penetrates into the porous structure without affecting the limestones’ natural properties. The treatment is of industrial relevance since it compares well with stone consolidants available commercially.
URI: https://www.um.edu.mt/library/oar//handle/123456789/18335
Appears in Collections:Scholarly Works - CenMMB
Scholarly Works - FacEngMME
Scholarly Works - FacSciChe

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