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Recycled Aggregates from Construction and Demolition Waste in the Manufacture of Urban Pavements

Construction and Demolition Waste (CDW) is among the largest waste streams in the world. Therefore, within the Circular Economy concept, there is a growing interest in its reuse. The purpose of this work was to study the use of recycled aggregates (RAs) obtained by a specific separation method from...

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Autores principales: Contreras-Llanes, Manuel, Romero, Maximina, Gázquez, Manuel Jesús, Bolívar, Juan Pedro
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2021
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8585343/
https://www.ncbi.nlm.nih.gov/pubmed/34772131
http://dx.doi.org/10.3390/ma14216605
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author Contreras-Llanes, Manuel
Romero, Maximina
Gázquez, Manuel Jesús
Bolívar, Juan Pedro
author_facet Contreras-Llanes, Manuel
Romero, Maximina
Gázquez, Manuel Jesús
Bolívar, Juan Pedro
author_sort Contreras-Llanes, Manuel
collection PubMed
description Construction and Demolition Waste (CDW) is among the largest waste streams in the world. Therefore, within the Circular Economy concept, there is a growing interest in its reuse. The purpose of this work was to study the use of recycled aggregates (RAs) obtained by a specific separation method from CDW, replacing natural aggregates (NAs) in the manufacture of precast concrete elements, such as kerbstones and paver blocks. The physical and technological properties of precast products formulated with RAs were analysed in accordance with current regulations, comparing them with those of commercial products manufactured with NAs. The results indicated that partial or total substitution of NAs by RAs increased the water absorption and apparent porosity values of the precast elements while reducing the bulk density and compressive strength. However, all units manufactured with RAs showed breaking load values higher than the minimum required by EN 1338 and, in some cases, slightly higher average tensile strength values than the reference material. In addition, some of the compositions including RAs gave rise to pieces that, according to their flexural strength, were classified as class 1 and marked S in accordance with EN 1340. According to abrasion resistance, in most cases, the precast elements are classified as Class 4 and I (≤20 mm). Finally, precast concrete produced from RAs satisfies the tolerance requirements for classification as class 3 (≤1.5 kg m(−2)). Therefore, it could be suitable for use in high pedestrian or traffic areas.
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spelling pubmed-85853432021-11-12 Recycled Aggregates from Construction and Demolition Waste in the Manufacture of Urban Pavements Contreras-Llanes, Manuel Romero, Maximina Gázquez, Manuel Jesús Bolívar, Juan Pedro Materials (Basel) Article Construction and Demolition Waste (CDW) is among the largest waste streams in the world. Therefore, within the Circular Economy concept, there is a growing interest in its reuse. The purpose of this work was to study the use of recycled aggregates (RAs) obtained by a specific separation method from CDW, replacing natural aggregates (NAs) in the manufacture of precast concrete elements, such as kerbstones and paver blocks. The physical and technological properties of precast products formulated with RAs were analysed in accordance with current regulations, comparing them with those of commercial products manufactured with NAs. The results indicated that partial or total substitution of NAs by RAs increased the water absorption and apparent porosity values of the precast elements while reducing the bulk density and compressive strength. However, all units manufactured with RAs showed breaking load values higher than the minimum required by EN 1338 and, in some cases, slightly higher average tensile strength values than the reference material. In addition, some of the compositions including RAs gave rise to pieces that, according to their flexural strength, were classified as class 1 and marked S in accordance with EN 1340. According to abrasion resistance, in most cases, the precast elements are classified as Class 4 and I (≤20 mm). Finally, precast concrete produced from RAs satisfies the tolerance requirements for classification as class 3 (≤1.5 kg m(−2)). Therefore, it could be suitable for use in high pedestrian or traffic areas. MDPI 2021-11-02 /pmc/articles/PMC8585343/ /pubmed/34772131 http://dx.doi.org/10.3390/ma14216605 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
Contreras-Llanes, Manuel
Romero, Maximina
Gázquez, Manuel Jesús
Bolívar, Juan Pedro
Recycled Aggregates from Construction and Demolition Waste in the Manufacture of Urban Pavements
title Recycled Aggregates from Construction and Demolition Waste in the Manufacture of Urban Pavements
title_full Recycled Aggregates from Construction and Demolition Waste in the Manufacture of Urban Pavements
title_fullStr Recycled Aggregates from Construction and Demolition Waste in the Manufacture of Urban Pavements
title_full_unstemmed Recycled Aggregates from Construction and Demolition Waste in the Manufacture of Urban Pavements
title_short Recycled Aggregates from Construction and Demolition Waste in the Manufacture of Urban Pavements
title_sort recycled aggregates from construction and demolition waste in the manufacture of urban pavements
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8585343/
https://www.ncbi.nlm.nih.gov/pubmed/34772131
http://dx.doi.org/10.3390/ma14216605
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