Método precipitação de calcita induzida microbianamente em argamassas de reparo

Abstract

Biotechnological processes gain space in a scenario where there is a great demand for infrastructure and accelerated urban growth. In this context, biocementation stands out, which is a microbiological process of calcium carbonate precipitation (MICP) that favors improvements in the properties of cementitious materials and is considered a green solution to guarantee an alternative and optimized product of paramount importance in civil construction. . Self-healing repair mortars are an example of a material that has gained visibility with the use of this technology. Therefore, the objective of this work is to carry out a survey and analyze the available literature on repair mortars produced with the Microbially Induced Calcite Precipitation (MICP) method. The search methodology followed an extensive and systematic procedure using the main scientific databases/publishers, namely: ScienceDirect, Web of Science, ResearchGate, Taylor and Francis, Springer and Google Scholar. With the use of keyword combinations, 35 articles were selected. Analyzing the articles, the results were grouped in different methods of obtaining repair mortars and the main properties worked on. In this sense, the repair mortar is developed with the addition of bacteria that carry out the work of promoting the healing of cracks and the improvement of the physical-mechanical properties. Through a database the research showed that the resistance to compression, the permeability to water and the healing of cracks, are the main properties considered for the application of the MICP method in the repair mortars and with the analyzes carried out it was observed favorable results in the use of bacterial treatment. In addition, it was found that among the methods of obtaining repair mortar, there are two different processes: external repair, which heals by applying a bacterial solution directly to the cracks in the mortar, and internal repair, which introduces it into the mortar mixture itself. the bacterial solution, that is, a self-healing mortar. External repair is more discussed than internal repair in basic works, having Sporosarsina pasteurii as the main bacteria used in the process. Therefore, the MICP methodology is promising, however, further investigations must be carried out to achieve conditions for large- scale applications.