Recycled Precast Concrete Kerbs and Paving Blocks, a Technically Viable Option for Footways

The linear economy paradigm in place to date has to be seriously challenged to give way to a new school of thought known as the circular economy. In this research work, precast kerbs and paving blocks made with recycled concrete (RACC-mixture) bearing 50 wt% mixed recycled aggregate (masonry content...

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Autores principales:	Andrés Juan-Valdés, Desirée Rodríguez-Robles, Julia García-González, María Isabel Sánchez de Rojas, Manuel Ignacio Guerra-Romero, Rebeca Martínez-García, Julia M. Morán-del Pozo
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	recycled cement mixed recycled aggregates recycled concrete precast concrete footways 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/809a427ad34e42e49a0022fdc0aa66bb
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spelling	oai:doaj.org-article:809a427ad34e42e49a0022fdc0aa66bb2021-11-25T18:15:40ZRecycled Precast Concrete Kerbs and Paving Blocks, a Technically Viable Option for Footways10.3390/ma142270071996-1944https://doaj.org/article/809a427ad34e42e49a0022fdc0aa66bb2021-11-01T00:00:00Zhttps://www.mdpi.com/1996-1944/14/22/7007https://doaj.org/toc/1996-1944The linear economy paradigm in place to date has to be seriously challenged to give way to a new school of thought known as the circular economy. In this research work, precast kerbs and paving blocks made with recycled concrete (RACC-mixture) bearing 50 wt% mixed recycled aggregate (masonry content of 33%) and an eco-efficient cementitious material as 25 wt% conventional binder replacement were evaluated to assess their intrinsic potential to replace traditional raw materials, in keeping with circular economy criteria. Therefore, precast products were subjected to mechanical strength, durability and microstructure tests and were compared to conventional concrete units (CC-mixture and commercially available precast elements). Although a class demotion was observed for water absorption and some decreases in flexural strength (26%), splitting tensile strength (12.8%) and electrical resistivity (45%) and a lower class water absorption were registered, and the recycled mixture also exhibited a greater performance in terms of compressive strength (6%), a better abrasion resistance classification and a comparable porosity and microstructure, which ensures a good concrete durability. In any case, the results showed that precast pieces were European standard-compliant, thus supporting the viability of the mixed recycled aggregates and eco-efficient cementitious replacement in footways.Andrés Juan-ValdésDesirée Rodríguez-RoblesJulia García-GonzálezMaría Isabel Sánchez de RojasManuel Ignacio Guerra-RomeroRebeca Martínez-GarcíaJulia M. Morán-del PozoMDPI AGarticlerecycled cementmixed recycled aggregatesrecycled concreteprecast concretefootwaysTechnologyTElectrical engineering. Electronics. Nuclear engineeringTK1-9971Engineering (General). Civil engineering (General)TA1-2040MicroscopyQH201-278.5Descriptive and experimental mechanicsQC120-168.85ENMaterials, Vol 14, Iss 7007, p 7007 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	recycled cement mixed recycled aggregates recycled concrete precast concrete footways 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 cement mixed recycled aggregates recycled concrete precast concrete footways 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 Andrés Juan-Valdés Desirée Rodríguez-Robles Julia García-González María Isabel Sánchez de Rojas Manuel Ignacio Guerra-Romero Rebeca Martínez-García Julia M. Morán-del Pozo Recycled Precast Concrete Kerbs and Paving Blocks, a Technically Viable Option for Footways
description	The linear economy paradigm in place to date has to be seriously challenged to give way to a new school of thought known as the circular economy. In this research work, precast kerbs and paving blocks made with recycled concrete (RACC-mixture) bearing 50 wt% mixed recycled aggregate (masonry content of 33%) and an eco-efficient cementitious material as 25 wt% conventional binder replacement were evaluated to assess their intrinsic potential to replace traditional raw materials, in keeping with circular economy criteria. Therefore, precast products were subjected to mechanical strength, durability and microstructure tests and were compared to conventional concrete units (CC-mixture and commercially available precast elements). Although a class demotion was observed for water absorption and some decreases in flexural strength (26%), splitting tensile strength (12.8%) and electrical resistivity (45%) and a lower class water absorption were registered, and the recycled mixture also exhibited a greater performance in terms of compressive strength (6%), a better abrasion resistance classification and a comparable porosity and microstructure, which ensures a good concrete durability. In any case, the results showed that precast pieces were European standard-compliant, thus supporting the viability of the mixed recycled aggregates and eco-efficient cementitious replacement in footways.
format	article
author	Andrés Juan-Valdés Desirée Rodríguez-Robles Julia García-González María Isabel Sánchez de Rojas Manuel Ignacio Guerra-Romero Rebeca Martínez-García Julia M. Morán-del Pozo
author_facet	Andrés Juan-Valdés Desirée Rodríguez-Robles Julia García-González María Isabel Sánchez de Rojas Manuel Ignacio Guerra-Romero Rebeca Martínez-García Julia M. Morán-del Pozo
author_sort	Andrés Juan-Valdés
title	Recycled Precast Concrete Kerbs and Paving Blocks, a Technically Viable Option for Footways
title_short	Recycled Precast Concrete Kerbs and Paving Blocks, a Technically Viable Option for Footways
title_full	Recycled Precast Concrete Kerbs and Paving Blocks, a Technically Viable Option for Footways
title_fullStr	Recycled Precast Concrete Kerbs and Paving Blocks, a Technically Viable Option for Footways
title_full_unstemmed	Recycled Precast Concrete Kerbs and Paving Blocks, a Technically Viable Option for Footways
title_sort	recycled precast concrete kerbs and paving blocks, a technically viable option for footways
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/809a427ad34e42e49a0022fdc0aa66bb
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Recycled Precast Concrete Kerbs and Paving Blocks, a Technically Viable Option for Footways

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