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Use of Mixed Microbial Cultures to Protect Recycled Concrete Surfaces: A Preliminary Study
Article

Biotreatments Using Microbial Mixed Cultures with Crude Glycerol and Waste Pinewood as Carbon Sources: Influence of Application on the Durability of Recycled Concrete

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Department of Engineering and Agricultural Sciences, School of Agricultural and Forest Engineering, University of León, Av. De Portugal 41, 24071 Leon, Spain
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Associated Laboratory for Green Chemistry-Chemistry and Technology Network (LAQV-REQUIMTE), Department of Chemistry, NOVA School of Science and Technology (FCT NOVA), NOVA University of Lisbon, 2829-516 Caparica, Portugal
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Applied Molecular Biosciences Unit (UCIBIO), Department of Chemistry, NOVA School of Science and Technology, Universidade NOVA de Lisboa, 2829-516 Caparica, Portugal
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Associate Laboratory i4HB—Institute for Health and Bioeconomy, NOVA School of Science and Technology, Universidade NOVA de Lisboa, 2829-516 Caparica, Portugal
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Civil Engineering Research and Innovation for Sustainability (CERIS), Department of Civil Engineering, NOVA School of Science and Technology (FCT NOVA), NOVA University of Lisbon, 2829-516 Caparica, Portugal
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Author to whom correspondence should be addressed.
Academic Editor: Alessandro P. Fantilli
Materials 2022, 15(3), 1181; https://doi.org/10.3390/ma15031181
Received: 20 December 2021 / Revised: 24 January 2022 / Accepted: 1 February 2022 / Published: 3 February 2022
(This article belongs to the Special Issue Bioinspired Approaches to Produce and Repair Greener Concrete)
Two eco-friendly healing bioproducts generated from microbial mixed cultures (MMC) for the production of polyhydroxyalkanoates (PHA) were used as surface treatments, with two residual materials used as the substrates, namely crude glycerol and pinewood bio-oil. Their ability to improve the durability of concrete samples containing recycled aggregates was assessed. To determine this protective capacity, 180 samples were analyzed using different tests, such as water penetration under pressure, capillary absorption, freeze–thaw and water droplet absorption test. Three types of conditions were used: outdoor–indoor exposure, re-application of biopolymers and application in vertical exposure conditions. The results showed reductions of up to 50% in the water penetration test and a delay in the water droplet absorption test of up to 150 times relative to the reference. The surface application of these bioproducts significantly reduced the degree of water penetration in recycled concrete, increasing its useful lifespan and proving to be a promising treatment for protecting concrete surfaces. View Full-Text
Keywords: construction and demolition waste (CDW); biopolymers; recycled concrete; surface treatment; PHA-producing MMC; waterproof construction and demolition waste (CDW); biopolymers; recycled concrete; surface treatment; PHA-producing MMC; waterproof
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MDPI and ACS Style

Serrano-González, L.; Merino-Maldonado, D.; Antolín-Rodríguez, A.; Lemos, P.C.; Pereira, A.S.; Faria, P.; Juan-Valdés, A.; García-González, J.; Morán-del Pozo, J.M. Biotreatments Using Microbial Mixed Cultures with Crude Glycerol and Waste Pinewood as Carbon Sources: Influence of Application on the Durability of Recycled Concrete. Materials 2022, 15, 1181. https://doi.org/10.3390/ma15031181

AMA Style

Serrano-González L, Merino-Maldonado D, Antolín-Rodríguez A, Lemos PC, Pereira AS, Faria P, Juan-Valdés A, García-González J, Morán-del Pozo JM. Biotreatments Using Microbial Mixed Cultures with Crude Glycerol and Waste Pinewood as Carbon Sources: Influence of Application on the Durability of Recycled Concrete. Materials. 2022; 15(3):1181. https://doi.org/10.3390/ma15031181

Chicago/Turabian Style

Serrano-González, Lorena, Daniel Merino-Maldonado, Andrea Antolín-Rodríguez, Paulo C. Lemos, Alice S. Pereira, Paulina Faria, Andrés Juan-Valdés, Julia García-González, and Julia M. Morán-del Pozo. 2022. "Biotreatments Using Microbial Mixed Cultures with Crude Glycerol and Waste Pinewood as Carbon Sources: Influence of Application on the Durability of Recycled Concrete" Materials 15, no. 3: 1181. https://doi.org/10.3390/ma15031181

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