Suitable yeast extract concentration for the production of self-healing mortar with expanded clay as bacterial carrier

P.  Risdanareni; L.  Ma; J.  Wang; N.  De Belie

doi:10.3989/mc.2022.02422

Autores/as

P. Risdanareni Department of Civil Engineering, Faculty of Engineering, State University of Malang - Magnel-Vandepitte Laboratory for Structural Engineering and Building Materials, Ghent University https://orcid.org/0000-0001-5190-1771
L. Ma Magnel-Vandepitte Laboratory for Structural Engineering and Building Materials, Ghent University https://orcid.org/0000-0001-8940-2505
J. Wang Department of Civil Engineering, Xi’an Jiaotong University https://orcid.org/0000-0001-9718-8633
N. De Belie Magnel-Vandepitte Laboratory for Structural Engineering and Building Materials, Ghent University https://orcid.org/0000-0002-0851-6242

DOI:

https://doi.org/10.3989/mc.2022.02422

Palabras clave:

MICP, Concentración de extracto de levadura, Mortero autorreparable, Propiedades mecánicas, Bacillus sphaericus, Arcilla expandida

Resumen

En el sistema de precipitación de carbonato de calcio inducido por microbios (MICP), el extracto de levadura (YE) es necesario para la germinación de las esporas. El objetivo de esta investigación es evaluar la cantidad mínima de YE en el mortero que permite que las esporas de Bacillus sphaericus germinen con un efecto negativo limitado en las propiedades del mortero. Se ensayaron dos concentraciones de YE de 2 y 5 g/l y se compararon con una referencia sin YE. Para proteger las bacterias en la matriz del mortero, las esporas o las células se encapsularon en arcilla expandida porosa. Se evaluó la actividad ureolítica de las bacterias con la variación de YE, las propiedades mecánicas y la capacidad de reparación del mortero. Los resultados muestran que una concentración de YE de 2 g/l proporcionó propiedades aceptables del mortero, mientras que fue suficiente para que las esporas germinaran y proporcionaran una capacidad de reparación satisfactoria al mortero resultante. Cuando se utilizan células vegetativas como agente de reparación, es mejor omitir el extracto de levadura en la mezcla de mortero.

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