Effect of natural coarse aggregate type on the physical and mechanical properties of recycled coarse aggregates

Zega, Claudio Javier; Zaccardi, Yury Villagrán; Maio, Ángel Antonio Di

doi:10.1617/s11527-009-9480-4

Cited by 89 publications

(44 citation statements)

References 7 publications

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“…Finally, the type and density of virgin aggregate also plays an important role. Some researchers indicate that it affects recycled aggregate properties more than the water to cement ratio of the original concrete (187).…”

Section: Saturated Surface Dry Densitymentioning

confidence: 99%

“…Finally, again, recycled aggregate obtained from concrete with a low water/cement ratio may exhibit a higher abrasion value than others from a concrete with a high water/cement ratio. This is due to the fact that the water/cement ratio of the original concrete is relatively less important than the abrasion loss value of the natural aggregate it contains (187).…”

Section: Abrasion Resistancementioning

confidence: 99%

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Study of recycled concrete aggregate quality and its relationship with recycled concrete compressive strength using database analysis

2016

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This work studies the physical and mechanical properties of recycled concrete aggregate (recycled aggregate from concrete waste) and their influence in structural recycled concrete compressive strength. For said purpose, a database has been developed with the experimental results of 152 works selected from over 250 international references.The processed database results indicate that the most sensitive properties of recycled aggregate quality are density and absorption. Moreover, the study analyses how the recycled aggregate (both percentage and quality) and the mixing procedure (pre-soaking or adding extra water) influence the recycled concrete strength of different categories (high or low water to cement ratios). When recycled aggregate absorption is low (under 5%), pre-soaking or adding extra water to avoid loss in workability will negatively affect concrete strength (due to the bleeding effect), whereas with high water absorption this does not occur and both of the aforementioned correcting methods can be accurately employed. RESUMEN: Estudio de la calidad del árido reciclado y su relación con la resistencia a compresión del hormigón reciclado utilizando una base de datos.El estudio analiza las propiedades físico-mecánicas de los áridos reciclados de hormigón (procedentes de residuos de hormigón) y su influencia en la resistencia a compresión del hormigón reciclado estructural. Para ello se ha desarrollado una base de datos con resultados de 152 trabajos seleccionados a partir de más de 250 referencias internacionales.Los resultados del tratamiento de la base indican que densidad y absorción son las propiedades más sensibles a la calidad del árido reciclado. Además, este estudio analiza cómo el árido reciclado (porcentaje y calidad) y el procedimiento de mezcla (presaturación o adición de agua extra) influyen en la resistencia del hormigón reciclado de diferentes categorías (alta o baja relación agua-cemento). Cuando la absorción es baja (inferior al 5%) presaturar o añadir agua para evitar pérdidas de trabajabilidad afectan negativamente a la resistencia (debido al bleeding), mientras que cuando es alta esto no sucede y ambos métodos son adecuados.

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Section: Saturated Surface Dry Densitymentioning

confidence: 99%

Section: Abrasion Resistancementioning

confidence: 99%

Study of recycled concrete aggregate quality and its relationship with recycled concrete compressive strength using database analysis

2016

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“…Besides the notable demand for specific landfill areas, the increasing lack of natural resources and growing environmental awareness prompt the use of construction waste as source material in the production of aggregates [4,5,6]. According to Buttler [7], concrete waste has considerable recycling potential compared with other kinds of waste, since it is relatively easy to recover information about the materials used in its formulation.…”

Section: Introductionmentioning

confidence: 99%

Stress-strain curve of concretes with recycled concrete aggregates: analysis of the NBR 8522 methodology

Gujel

Kazmierczak

Masuero

2017

Rev. IBRACON Estrut. Mater.

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Stress-strain curve of concretes with recycled concrete aggregates: analysis of the NBR 8522 methodologyDiagrama tensão-deformação específica em concretos com agregados reciclados de concreto: análise da metodologia proposta pela NBR 8522 Abstract ResumoThis work analyses the methodology "A" (item A.4) employed by the Brazilian Standard ABNT 8522 (ABNT, 2008) for determining the stress-strain behavior of cylindrical specimens of concrete, presenting considerations about possible enhancements aiming it use for concretes with recycled aggregates with automatic test equipment. The methodology specified by the Brazilian Standard presents methodological issues that brings distortions in obtaining the stress-strain curve, as the use of a very limited number of sampling points and by inducing micro cracks and fluency in the elastic behavior of the material due to the use of steady stress levels in the test. The use of a base stress of 0.5 MPa is too low for modern high load test machines designed do high strength concrete test. The work presents a discussion over these subjects, and a proposal of a modified test procedure to avoid such situations. Este trabalho analisa a metodologia descrita no Anexo "A" (item A.4) da Norma NBR 8522 (ABNT, 2008) para a determinação do diagrama tensão-deformação específica em corpos-de-prova cilíndricos de concreto apresentando considerações sobre possíveis adequações de seu uso para concretos com agregados reciclados e com equipamentos automatizados. A metodologia especificada na norma apresenta restrições metodológicas que geram distorções na obtenção do diagrama tensão-deformação, tais como o uso de número muito limitado de pontos de leitura e a inclusão, no comportamento elástico do material, de fenômenos diferidos como microfissuração e fluência ocorridos durante os patamares de estabilização de carga. A tensão básica de 0,5 MPa, especificada para garantir a estabilização da carga, é inadequada para grande parte das prensas automatizadas modernas, projetadas para o ensaio de concretos de alta resistência. São discutidos alguns aspectos da Norma e propostas alterações metodológicas. Palavras-chave:Norma 8522 (ABNT, 2008), concreto, módulo de elasticidade estático, diagrama tensão-deformação específica.

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“…Por este motivo, se han llevado a cabo numerosas investigaciones sobre su utilización, ya sea como agregado fino o grueso, para la elaboración de un nuevo hormigón (Señas L., et al, 2006;Etxeberria M. et al, 2007;Tam W.Y. et al, 2005;Zega C.J. et al, 2010).…”

Section: Introductionunclassified

Incorporación de aditivos en hormigones reciclados para modificar sus propiedades

Moro

Meneses

Señas

et al. 2014

Ciencia Y Tecnología

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Effect of natural coarse aggregate type on the physical and mechanical properties of recycled coarse aggregates

Cited by 89 publications

References 7 publications

Study of recycled concrete aggregate quality and its relationship with recycled concrete compressive strength using database analysis

Study of recycled concrete aggregate quality and its relationship with recycled concrete compressive strength using database analysis

Stress-strain curve of concretes with recycled concrete aggregates: analysis of the NBR 8522 methodology

Incorporación de aditivos en hormigones reciclados para modificar sus propiedades

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