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:	Manuel Contreras-Llanes, Maximina Romero, Manuel Jesús Gázquez, Juan Pedro Bolívar
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	recycled mixed aggregates construction and demolition waste treatments improvement eco-efficient materials urban pavements environmental impact Technology T Electrical engineering. Electronics. Nuclear engineering TK1-9971 Engineering (General). Civil engineering (General) TA1-2040 Microscopy QH201-278.5 Descriptive and experimental mechanics QC120-168.85
Acceso en línea:	https://doaj.org/article/495082d845764ff4809a14872b4fa8b9
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spelling	oai:doaj.org-article:495082d845764ff4809a14872b4fa8b92021-11-11T18:08:35ZRecycled Aggregates from Construction and Demolition Waste in the Manufacture of Urban Pavements10.3390/ma142166051996-1944https://doaj.org/article/495082d845764ff4809a14872b4fa8b92021-11-01T00:00:00Zhttps://www.mdpi.com/1996-1944/14/21/6605https://doaj.org/toc/1996-1944Construction 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<sup>−2</sup>). Therefore, it could be suitable for use in high pedestrian or traffic areas.Manuel Contreras-LlanesMaximina RomeroManuel Jesús GázquezJuan Pedro BolívarMDPI AGarticlerecycled mixed aggregatesconstruction and demolition wastetreatments improvementeco-efficient materialsurban pavementsenvironmental impactTechnologyTElectrical engineering. Electronics. Nuclear engineeringTK1-9971Engineering (General). Civil engineering (General)TA1-2040MicroscopyQH201-278.5Descriptive and experimental mechanicsQC120-168.85ENMaterials, Vol 14, Iss 6605, p 6605 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	recycled mixed aggregates construction and demolition waste treatments improvement eco-efficient materials urban pavements environmental impact Technology T Electrical engineering. Electronics. Nuclear engineering TK1-9971 Engineering (General). Civil engineering (General) TA1-2040 Microscopy QH201-278.5 Descriptive and experimental mechanics QC120-168.85
spellingShingle	recycled mixed aggregates construction and demolition waste treatments improvement eco-efficient materials urban pavements environmental impact Technology T Electrical engineering. Electronics. Nuclear engineering TK1-9971 Engineering (General). Civil engineering (General) TA1-2040 Microscopy QH201-278.5 Descriptive and experimental mechanics QC120-168.85 Manuel Contreras-Llanes Maximina Romero Manuel Jesús Gázquez Juan Pedro Bolívar Recycled Aggregates from Construction and Demolition Waste in the Manufacture of Urban Pavements
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<sup>−2</sup>). Therefore, it could be suitable for use in high pedestrian or traffic areas.
format	article
author	Manuel Contreras-Llanes Maximina Romero Manuel Jesús Gázquez Juan Pedro Bolívar
author_facet	Manuel Contreras-Llanes Maximina Romero Manuel Jesús Gázquez Juan Pedro Bolívar
author_sort	Manuel Contreras-Llanes
title	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_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_sort	recycled aggregates from construction and demolition waste in the manufacture of urban pavements
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/495082d845764ff4809a14872b4fa8b9
work_keys_str_mv	AT manuelcontrerasllanes recycledaggregatesfromconstructionanddemolitionwasteinthemanufactureofurbanpavements AT maximinaromero recycledaggregatesfromconstructionanddemolitionwasteinthemanufactureofurbanpavements AT manueljesusgazquez recycledaggregatesfromconstructionanddemolitionwasteinthemanufactureofurbanpavements AT juanpedrobolivar recycledaggregatesfromconstructionanddemolitionwasteinthemanufactureofurbanpavements
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Recycled Aggregates from Construction and Demolition Waste in the Manufacture of Urban Pavements

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