Métodos granulométricos en la caracterización del árido reciclado para su uso en hormigón estructural

Martín-Morales, M.; Sánchez-Roldán, Z.; Zamorano, M.

doi:10.3989/mc.2013.mc.06511

Cited by 6 publications

(2 citation statements)

References 13 publications

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“…more paste in crushed sand is needed to reduce the interparticle friction. Martín-Morales et al (19) and Medina et al (20), studied recycled concrete, where natural coarse aggregate was substituted by recycled construction and demolition waste and ceramic aggregate, respectively. Both of them decided to used natural sand to obtain a good workability in fresh state and a better durability when it is hardened.…”

Section: Discussionmentioning

confidence: 99%

Effect of the aggregate grading on the concrete air permeability

Argiz¹,

Sanjuán²,

Muñoz-Martialay³

2014

Mater. construcc.

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Great durability problems are being found in concrete structures related to the penetrability of aggressive agents through the concrete (ie. chloride penetration, sulphate attack, carbonation, freezing and thawing, and so on). Air permeability coefficient is used as an effective tool to estimate the potential durability of concrete structures due to its direct relation with the microstructure and the moisture content. This paper discusses the effect of the aggregate grading and water/cement ratio on the air permeability coefficient. An aggregate grading with more sand than coarse aggregates has resulted more beneficial from the point of view of concrete air permeability. This fact can be attributed to a denser skeleton formed by the finer aggregates. With fine aggregates, the higher water/cement ratio, the lower air permeability. However, the contrary was found with coarse aggregates. Overall, a temperature increase from 20 °C to 60 °C during preconditioning led to a D air increase of 40-80%. RESUMEN: Efecto de la granulometría de los áridos en la permeabilidad al aire del hormigón.Se han encontrado una gran cantidad de problemas de durabilidad de estructuras de hormigón relacionados con la penetración de agentes agresivos externos (es decir, penetración de cloruros, ataque por sulfatos, carbonatación, hielo-deshielo, etc.). El coeficiente de permeabilidad al aire se utiliza como una herramienta eficaz para estimar la durabilidad potencial de las estructuras de hormigón debido a su relación directa con su microestructura y contenido de humedad.Se discute el efecto de la gradación de los áridos y relación agua/cemento en el coeficiente de permeabilidad al aire. Con áridos más finos que gruesos, el resultado es más beneficioso, lo que se atribuye a que la arena forma un esqueleto más denso. Con áridos más finos, al aumentar la relación agua/cemento, disminuye la permeabilidad al aire; pero con áridos más gruesos se ha observado lo contrario. Cuando se pre-acondiciona de 20 °C a 60 °C, se produce un aumento del D air del 40-80%.

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Section: Discussionmentioning

confidence: 99%

Effect of the aggregate grading on the concrete air permeability

Argiz¹,

Sanjuán²,

Muñoz-Martialay³

2014

Mater. construcc.

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“…With regard to fines content, RCA had not a high proportion of fine particles. Due to their characteristics, both aggregates were shown to be suitable for concrete (42), although as expected the saturated-surface-dry particle density of RCA was lower and water absorption higher than NA, this is due to old mortar that adheres to RCA (16).…”

Section: Methodsmentioning

confidence: 99%

Study of potential advantages of pre-soaking on the properties of pre-cast concrete made with recycled coarse aggregate

et al. 2016

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Recycled aggregate (RA) from construction and demolition waste is traditionally used for the manufacture of concrete for different applications. Due primarily to high water content required by RA, the quality of the concrete is determined by the amount of replacement RA. The aim of this study is to determine if RA pre-soaking enhances the properties of pre-cast concrete for street furniture, with low mechanical and structural requirements, in which 100% of the coarse fraction is replaced. The results of physical and mechanical tests performed on concrete specimens in which the RA was pre-soaked using five different methods applied are compared with a reference concrete sample and a concrete sample made with non-pre-soaked RA. The results show that non-pre-soaked RA offers improved physical-mechanical properties for pre-cast concrete, except for the workability; problems arising from poorer workability could be improved with the use of plasticizers, which can be easily included in the production process. RESUMEN: Estudio de las ventajas potenciales del premojado en las propiedades del hormigón prefabricado con árido reciclado grueso.El árido reciclado (AR) procedente de residuos de construcción y demolición se utiliza tradicionalmente en la elaboración de hormigón para diferentes aplicaciones. Debido principalmente al mayor contenido en agua requerido por el AR, la calidad del hormigón está determinada por la cantidad de AR reemplazado. El objetivo de este estudio es determinar si el AR premojado mejora las propiedades del hormigón prefabricado para mobiliario urbano, con bajas exigencias mecánicas y estructurales, en el que se sustituye el 100% de la fracción gruesa. Los resultados de los ensayos físicos y mecánicos realizados sobre muestras de hormigón en las cuales el AR se ha premojado usando cinco métodos diferentes se han comparado con una muestra de hormigón de referencia y una muestra de hormigón fabricada con AR no premojado. Los resultados muestran que el AR no premojado proporciona propiedades físico-mecánicas mejoradas en el hormigón prefabricado, a excepción de la trabajabilidad; los problemas derivados de una deficiente trabajabilidad pueden ser fácilmente corregidos con la incorporación de plastificantes en el proceso de fabricación.

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