Porosity of recycled concrete with substitution of recycled concrete aggregate

Gómez-Soberón, José Manuel

doi:10.1016/s0008-8846(02)00795-0

Cited by 558 publications

(246 citation statements)

References 3 publications

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“…This leads to a change in stress distribution of mortar and aggregates over time during the creep process, both at early and latter ages. Similar findings have been reported by other authors (2,6,69,78,89,90), who noted largely higher (up to 84%) creep strains in concrete fully made with coarse recycled aggregates than in conventional concrete, while these increments lessened to 5-26% in concrete with low replacement ratios (20-30%) ( Figure 16). …”

Section: Creepsupporting

confidence: 90%

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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Section: Creepsupporting

confidence: 90%

Recycled concrete with coarse recycled aggregate. An overview and analysis

González-Fonteboa

Seara-Paz

Brito³

et al. 2018

Mater. construcc.

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“…These values are quite similar to those obtained in different studies consulted in bibliography [18][19][20][21].…”

Section: Laboratory Testingsupporting

confidence: 90%

Limiting properties in the characterisation of mixed recycled aggregates for use in the manufacture of concrete

Agrela

Juan

Ayuso

et al. 2011

Construction and Building Materials

201

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Recycling of construction and demolition waste (CDW) has become a widespread concern in Spain for the last years, as a way to preserve natural resources and achieve a better control of waste disposal sites. Specific applications which make use of mixed recycled aggregates are of great importance, as this types of aggregates constitute the majority of the total production. Structural and non-structural concrete is one of the possible applications, being this the main goal of our study.This paper presents a study on the physical and chemical characteristics of mixed recycled aggregates which have been obtained from different CDW treatment plants of Spain. Correlations between the different properties were investigated in order to find criterions of acceptance for recycled aggregates to be used in concrete.The comparison between the properties offers the possibility of pre-selecting a great quantity of mixed recycled aggregates, these being suitable for either structural and non-structural concrete. The determination of water absorption and the gypsum content are good indicators in order to evalúate the quality of the mixed recycled aggregates for its application in the production of concrete.

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“…In agreement with the presented model, substituting the natural aggregate for the recycled aggregate results in a reduction of the deformation module for all of the aggregate types, which is consistent with many papers by other authors [14], [21], [22], [19]. It is also observed that substituting the coarse aggregate produces a greater effect in the module loss than substituting the fine aggregate, as a result of the magnitude of the coefficients found for them.…”

Section: Influence Of the Type Of Recycled Aggregate From Constructiosupporting

confidence: 91%

Determinação da influência do tipo de agregado reciclado de resíduo de construção e demolição sobre o módulo de deformação de concretos produzidos com agregados reciclados

Cabral

Schalch²,

Molin

et al. 2008

Rev. IBRACON Estrut. Mater.

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Com o intuito de contribuir no estudo de concretos produzidos com agregados reciclados, produziu-se um traço de referência (com agregados naturais) e outros 49 traços, substituindo-se os agregados naturais por agregados reciclados de concreto, de argamassa e de cerâmica vermelha, que são os 3 maiores constituintes dos resíduos de construção e demolição das cidades brasileiras. Além do tipo de agregado, também variou-se a relação água/cimento (a/c), entre os valores de 0,4 a 0,8, fixando-se o teor de água na pré-umidificação dos agregados reciclados. O módulo de deformação dos concretos foram determinados aos 28 dias, utilizando-se a norma brasileira ABNT NBR 8522/03, em corpos-de-prova cilíndricos. Os resultados apontam que a substituição do agregado natural pelo reciclado resulta em uma redução do módulo de deformação, sendo que o agregado graúdo de cerâmica vermelha e o agregado miúdo reciclado de concreto foram os que exerceram a maior e a menor influência, respectivamente, sobre o módulo de deformação dos concretos produzidos.

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Porosity of recycled concrete with substitution of recycled concrete aggregate

Cited by 558 publications

References 3 publications

Recycled concrete with coarse recycled aggregate. An overview and analysis

Recycled concrete with coarse recycled aggregate. An overview and analysis

Limiting properties in the characterisation of mixed recycled aggregates for use in the manufacture of concrete

Determinação da influência do tipo de agregado reciclado de resíduo de construção e demolição sobre o módulo de deformação de concretos produzidos com agregados reciclados

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