Evidence of a bacterial carbonate coating on plaster samples subjected to the Calcite Bioconcept biomineralization technique

Abstract

Degradation of historical buildings is mainly due to the intrusion of water which is the main vector of pollutants. Different types of surface treatment have been proposed to avoid or limit this effect. One alternative to chemical treatments is the use of the carbonatogenesis property of some bacteria. This bacterial production has been evidenced on concrete and on limestone samples in an aqueous environment. However, the carbonate production was measured indirectly and the experimental protocol was far from real conditions of use. In this paper, with the same protocol as an industrial one, and using a surface selective investigation method, grazing incidence X-ray diffraction, we show the structural and morphological evolution of the carbonate coating produced on model plaster samples. This substrate was chosen in order to unambiguously detect the bacterial carbonate production.

Study on the Remediation of Cd Pollution by the Biomineralization of Urease-Producing Bacteria

“…Previous studies have shown that strains have higher urease activity under neutral or alkaline conditions [34,35]. In this study, the strains were added to a medium containing urea and Cd 2+ at conditions of pH = 7 and 37 °C for Cd 2+ precipitation (Figure 3).…”

La bioprecipitación de carbonato de calcio por la biota nativa como un método de restauración.

“…Recientemente se han publicado revisiones de lo más actual en cuanto a biocementación en concreto, sobre la precipitación bacteriana de carbonatos, los procesos químicos y su actividad de auto reparación de las bacterias incorporadas a los materiales para aplicación de calcita inducida microbiológicamente (Talaiekhozen et al, 2014;Verma et al, 2015) Experimentos sobre el tiempo de vida útil realizados sobre monumentos de roca caliza han mostrado un efecto protector de la capa de calcita depositada por la bacteria por varios años. Se ha sugerido que un nuevo tratamiento debería ser aplicado cada diez años (Castanier et El desgaste de los edificios es un problema generalizado que encontramos en muchas partes alrededor del mundo, ya sean hechos estos edificios de concreto así como edificios históricos hechos de rocas o ladrillos (Anne et al, 2010). En la ciudad de México existen una gran cantidad de monumentos considerados patrimonio histórico que presentan signos de daño, degradación y destrucción debido al incremento de la contaminación, factores medioambientales y biológicos.…”

Smart Bio-Agents-Activated Sustainable Self-Healing Cementitious Materials: An All-Inclusive Overview on Progress, Benefits and Challenges

“…Standard concrete experienced four times less water absorption than the mentioned mix, wherein the CS of the FA-included concrete was improved up to 22% [119]. In the initial stages of the crack formation, the mentioned autonomous healing technique could fill-in the crack, demonstrating its potential [120]. In brief, it was demonstrated that the autonomous healing approaches using vascular systems, capsules, and hydro gel encapsulation are effective in triggering the calcite precipitation in the concrete specimens and, thus, are capable of self-healing the concrete cracks.…”