Use of Bioproducts Derived from Mixed Microbial Cultures Grown with Crude Glycerol to Protect Recycled Concrete Surfaces

The large increase in the world population has resulted in a very large amount of construction waste, as well as a large amount of waste glycerol from transesterification reactions of acyl glycerides from oils and fats, in particular from the production of biodiesel. Only a limited percentage of the...

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Bibliographic Details
Published in:Materials 2021-04, Vol.14 (8), p.2057
Main Authors: Serrano-González, Lorena, Merino-Maldonado, Daniel, Guerra-Romero, Manuel Ignacio, Morán-Del Pozo, Julia María, Lemos, Paulo Costa, Pereira, Alice Santos, Faria, Paulina, García-González, Julia, Juan-Valdés, Andrés
Format: Article
Language:English
Subjects:
Aggregates
Barriers
Biodiesel fuels
Capillarity
Carbon
Cement
Concrete
Construction
Construction materials
Demolition
Drinking water
Glycerides
Glycerol
Humidity
Low pressure
Microorganisms
Penetration
Permeability
Polyhydroxyalkanoates
Recycled materials
Surface chemistry
Transesterification
Tubes
Viscosity
Water absorption
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Summary:The large increase in the world population has resulted in a very large amount of construction waste, as well as a large amount of waste glycerol from transesterification reactions of acyl glycerides from oils and fats, in particular from the production of biodiesel. Only a limited percentage of these two residues are recycled, which generates a large management problem worldwide. For that reason, in this study, we used crude glycerol as a carbon source to cultivate polyhydroxyalkanoates (PHA)-producing mixed microbial cultures (MMC). Two bioproducts derived from these cultures were applied on the surface of concrete with recycled aggregate to create a protective layer. To evaluate the effect of the treatments, tests of water absorption by capillarity and under low pressure with Karsten tubes were performed. Furthermore, SEM-EDS analysis showed the physical barrier caused by biotreatments that produced a reduction on capillarity water absorption of up to 20% and improved the impermeability of recycled concrete against the penetration of water under pressure up to 2.7 times relative to the reference. Therefore, this bioproduct shown to be a promising treatment to protect against penetration of water to concrete surfaces increasing its durability and useful life.
ISSN:1996-1944
1996-1944
DOI:10.3390/ma14082057