Influence of biomineralization on mechanical and physical characteristics of Hungarian limestone

摘要

Bacteria induced calcium carbonate precipitation nowadays is a widely examined process being a possible alternative for traditional stone conservation methods. Thus application connected, in situ experiments are recommended by researchers engaged in bioconsolidation. In our experiment, method and materials developed by a French research group were applied on Hungarian porous limestone specimens in situ. Different from the original method samples were immersed into the liquid compound, instead of spraying the curing solution onto their surface. According to their apparent porosity characteristics and fabrics, samples were divided into four groups. Changes in mass-properties, com-pressive strength and Young's modulii of the specimens due to the biodeposition were measured, respectively. Cured specimens gave better results for all the examined properties, comparing to the non-cured ones. Due to previous recommendations and practical reasons, color changes induced by the biomineralization were also measured. Changes of the shade were evaluated by comparing images taken before, during and after the treatment. As result, some degree of darkening was observed.