Mechanical recycling of EOL concrete into high-grade aggregates

Lotfi, Somayeh; Deja, Jan; Rem, Peter; Mróz, Radosław; Roekel, Eric van; Stelt, H van der

doi:10.1016/j.resconrec.2014.03.010

Cited by 79 publications

(37 citation statements)

References 7 publications

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“…Existing research on the matter points towards negligible influence or a slight decline in this property with increasing coarse RCA content (65,(148)(149)(150)(151)(152)(153)(154).…”

Section: Resistance To Abrasionmentioning

confidence: 99%

Recycled concrete with coarse recycled aggregate. An overview and analysis

González-Fonteboa

Seara-Paz

Brito³

et al. 2018

Mater. construcc.

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ABSTRACT:The construction field has contributed to environmental degradation, producing a high amount of construction and demolition waste (C&D waste) and consuming large volumes of natural resources. In this context, recycled concrete (RC) has been recognised as a means to preserve natural resources and reduce space for waste storage. During the last decades, many researchers have developed works studying different recycled concrete properties.This review focuses on structural RC made with coarse recycled aggregate from concrete waste. The main objective is to provide a state of the art report on RC's properties and an analysis on how to predict them taking into account relevant research works. Moreover, the study tries to collect and update RC findings, proposing equations to define RC's performance, in terms of mechanical strength, modulus of elasticity, stress-strain, creep and shrinkage. RESUMEN:Hormigón reciclado con árido grueso reciclado. Una visión general y análisis. El campo de la construcción ha contribuido a la degradación del medio ambiente, produciendo gran cantidad de residuos de construcción y demolición y consumiendo grandes volúmenes de recursos naturales. En este contexto, el hormigón reciclado se ha presentado como una opción para preservar los recursos naturales y reducir el espacio destinado a vertedero. Así, durante las últimas décadas, muchos investigadores han desarrollado trabajos para estudiar las propiedades del hormigón reciclado.Este artículo se centra en el hormigón estructural fabricado con árido reciclado grueso procedente de residuos de hormigón. El principal objetivo es desarrollar un estado del arte que recoja las principales propiedades del hormigón reciclado y un análisis de cómo calcularlas teniendo en cuenta un gran número de trabajos relevantes en este ámbito. Adicionalmente, el estudio recopila y actualiza el conocimiento sobre estos hormigones, proponiendo ecuaciones que permitan definir sus resistencias mecánicas, módulo de elasticidad, tensión-deformación, fluencia y retracción.

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“…Existing research on the matter points towards negligible influence or a slight decline in this property with increasing coarse RCA content (65,(148)(149)(150)(151)(152)(153)(154).…”

Section: Resistance To Abrasionmentioning

confidence: 99%

Recycled concrete with coarse recycled aggregate. An overview and analysis

González-Fonteboa

Seara-Paz

Brito³

et al. 2018

Mater. construcc.

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“…The C2CA (Concrete to Cement and Aggregate) concrete recycling process aims at a cost-effective system approach for recycling high-volume End Of Life (EOL) concrete streams into prime-grade aggregates and cement (see Figure 1) [6].…”

Section: C2ca Concrete Recycling and Current Research Backgroundmentioning

confidence: 99%

Recycling of End of Life Concrete Fines into Hardened Cement and Clean Sand

Lotfi¹,

Rem²

2016

JEP

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One of the massive by-products of concrete to concrete recycling is the crushed concrete fines, that is often 0 -4mm. Although the construction sector is to some extent familiar with the utilization of the recycled coarse fraction (>4 mm), at present there is no high-quality application for fines due to its moisturized and contaminated nature. Here we present an effective recycling process on lab scale to separate the cementitious powder from the sandy part in the crushed concrete fines and deliver attractive products with the minimum amount of contaminants. For this study, a lab scale Heating-Air classification system was designed and constructed. A combination of heat and air classification, resulted in a proper separation of finer fraction (0 -0.250 mm), from coarser fractions. Heating of the materials was followed by ball milling to enhance the liberation of the cementitious fraction. Experiments were carried out at different heating temperatures and milling durations. Experimental results show that by heating the materials to 500˚C for 30 seconds, the required time of ball milling is diminished by a factor of three and the quality of the recycling products satisfies well the market demand. In addition, the removal of contaminants is complete at 500˚C. The amount of CaO in the recovered finer fraction from the recycling process is comparable with the amount of CaO in low-quality limestone. By using this fraction in the cement kiln as the replacement of limestone, the release of the chemically bound CO2 could be reduced by a factor of three.

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“…16 The samples are composed of concrete aggregates obtained by ADR processing carried out at TUDelft (Delft, The Netherlands) and selected typologies of unwanted contaminants: brick, foam, wood, plastic, and gypsum (Fig. 1).…”

Section: Analyzed Demolition Waste Samplesmentioning

confidence: 99%

Hyperspectral imaging applied to demolition waste recycling: innovative approach for product quality control

Serranti

Palmieri

Bonifazi

2015

J. Electron. Imaging

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Abstract. Hyperspectral imaging (HSI) based sensing devices were utilized to develop nondestructive, rapid, and low cost analytical strategies finalized to detect and characterize materials constituting demolition waste. In detail, HSI was applied for quality control of high-grade recycled aggregates obtained from end-of-life concrete. The described HSI quality control approach is based on the utilization of a platform working in the near-infrared range (1000-1700 nm). The acquired hyperspectral images were analyzed by applying different chemometric methods: principal component analysis for data exploration and partial least-square-discriminant analysis to build classification models. Results showed that it is possible to recognize the recycled aggregates from different contaminants (e.g., brick, gypsum, plastic, wood, foam, and so on), allowing the quality control of the recycled flow stream. © The Authors. Published by SPIE under a Creative Commons Attribution 3.0 Unported License. Distribution or reproduction of this work in whole or in part requires full attribution of the original publication, including its DOI.

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Mechanical recycling of EOL concrete into high-grade aggregates

Cited by 79 publications

References 7 publications

Recycled concrete with coarse recycled aggregate. An overview and analysis

Recycled concrete with coarse recycled aggregate. An overview and analysis

Recycling of End of Life Concrete Fines into Hardened Cement and Clean Sand

Hyperspectral imaging applied to demolition waste recycling: innovative approach for product quality control

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