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The Design and Development of Recycled Concretes in a Circular Economy Using Mixed Construction and Demolition Waste

This research study analysed the effect of adding fine—fMRA (0.25% and 50%)—and coarse—cMRA (0%, 25% and 50%)—mixed recycled aggregate both individually and simultaneously in the development of sustainable recycled concretes that require a lower consumption of natural resources. For this purpose, we...

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Autores principales: González, Marcos Díaz, Plaza Caballero, Pablo, Fernández, David Blanco, Jordán Vidal, Manuel Miguel, del Bosque, Isabel Fuencisla Sáez, Medina Martínez, César
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2021
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8401104/
https://www.ncbi.nlm.nih.gov/pubmed/34443285
http://dx.doi.org/10.3390/ma14164762
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author González, Marcos Díaz
Plaza Caballero, Pablo
Fernández, David Blanco
Jordán Vidal, Manuel Miguel
del Bosque, Isabel Fuencisla Sáez
Medina Martínez, César
author_facet González, Marcos Díaz
Plaza Caballero, Pablo
Fernández, David Blanco
Jordán Vidal, Manuel Miguel
del Bosque, Isabel Fuencisla Sáez
Medina Martínez, César
author_sort González, Marcos Díaz
collection PubMed
description This research study analysed the effect of adding fine—fMRA (0.25% and 50%)—and coarse—cMRA (0%, 25% and 50%)—mixed recycled aggregate both individually and simultaneously in the development of sustainable recycled concretes that require a lower consumption of natural resources. For this purpose, we first conducted a physical and mechanical characterisation of the new recycled raw materials and then analysed the effect of its addition on fresh and hardened new concretes. The results highlight that the addition of fMRA and/or cMRA does not cause a loss of workability in the new concrete but does increase the amount of entrained air. Regarding compressive strength, we observed that fMRA and/or cMRA cause a maximum increase of +12.4% compared with conventional concrete. Tensile strength increases with the addition of fMRA (between 8.7% and 5.5%) and decreases with the use of either cMRA or fMRA + cMRA (between 4.6% and 7%). The addition of fMRA mitigates the adverse effect that using cMRA has on tensile strength. Regarding watertightness, all designed concretes have a structure that is impermeable to water. Lastly, the results show the feasibility of using these concretes to design elements with a characteristic strength of 25 MPa and that the optimal percentage of fMRA replacement is 25%.
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spelling pubmed-84011042021-08-29 The Design and Development of Recycled Concretes in a Circular Economy Using Mixed Construction and Demolition Waste González, Marcos Díaz Plaza Caballero, Pablo Fernández, David Blanco Jordán Vidal, Manuel Miguel del Bosque, Isabel Fuencisla Sáez Medina Martínez, César Materials (Basel) Article This research study analysed the effect of adding fine—fMRA (0.25% and 50%)—and coarse—cMRA (0%, 25% and 50%)—mixed recycled aggregate both individually and simultaneously in the development of sustainable recycled concretes that require a lower consumption of natural resources. For this purpose, we first conducted a physical and mechanical characterisation of the new recycled raw materials and then analysed the effect of its addition on fresh and hardened new concretes. The results highlight that the addition of fMRA and/or cMRA does not cause a loss of workability in the new concrete but does increase the amount of entrained air. Regarding compressive strength, we observed that fMRA and/or cMRA cause a maximum increase of +12.4% compared with conventional concrete. Tensile strength increases with the addition of fMRA (between 8.7% and 5.5%) and decreases with the use of either cMRA or fMRA + cMRA (between 4.6% and 7%). The addition of fMRA mitigates the adverse effect that using cMRA has on tensile strength. Regarding watertightness, all designed concretes have a structure that is impermeable to water. Lastly, the results show the feasibility of using these concretes to design elements with a characteristic strength of 25 MPa and that the optimal percentage of fMRA replacement is 25%. MDPI 2021-08-23 /pmc/articles/PMC8401104/ /pubmed/34443285 http://dx.doi.org/10.3390/ma14164762 Text en © 2021 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
González, Marcos Díaz
Plaza Caballero, Pablo
Fernández, David Blanco
Jordán Vidal, Manuel Miguel
del Bosque, Isabel Fuencisla Sáez
Medina Martínez, César
The Design and Development of Recycled Concretes in a Circular Economy Using Mixed Construction and Demolition Waste
title The Design and Development of Recycled Concretes in a Circular Economy Using Mixed Construction and Demolition Waste
title_full The Design and Development of Recycled Concretes in a Circular Economy Using Mixed Construction and Demolition Waste
title_fullStr The Design and Development of Recycled Concretes in a Circular Economy Using Mixed Construction and Demolition Waste
title_full_unstemmed The Design and Development of Recycled Concretes in a Circular Economy Using Mixed Construction and Demolition Waste
title_short The Design and Development of Recycled Concretes in a Circular Economy Using Mixed Construction and Demolition Waste
title_sort design and development of recycled concretes in a circular economy using mixed construction and demolition waste
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8401104/
https://www.ncbi.nlm.nih.gov/pubmed/34443285
http://dx.doi.org/10.3390/ma14164762
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