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DIGITAL.CSIC
Conference object . 2020 . Peer-reviewed
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Effect of recycled concrete aggregate on the mechanical performance of recycled concretes

Authors: Plaza, Pablo; Sáez del Bosque, Isabel F.; Velardo, Paula; Sánchez de Rojas, María Isabel; Frías, Moisés; Medina, César;

Effect of recycled concrete aggregate on the mechanical performance of recycled concretes

Abstract

[ES]: La generación de residuos es una consecuencia inevitable de la actividad de cualquier sector. En concreto, en el sector de la construcción se generaron en torno a 840 millones de toneladas de residuos en el conjunto de la Unión Europea durante el año 2014, lo que supone en torno a un 35% de la producción total de residuos. Esta gran cantidad de residuos generados crea la necesidad de realizar y fomentar una correcta gestión de los mismos, para impulsar su inclusión en el proceso de fabricación de nuevos materiales. En este actual contexto de economía circular, la utilización de áridos reciclados en la fabricación de nuevos hormigones ha ido aumentando progresivamente en los últimos años, situándose en un 8% la utilización de estos áridos en el ámbito de la ingeniería civil en el año 2014. Actualmente, la EHE-08 permite la sustitución de hasta un 20% de la fracción gruesa de árido natural por árido reciclado procedente exclusivamente del machaqueo de hormigón. El presente trabajo de investigación pretende analizar la viabilidad de incorporar simultáneamente la fracción fina y gruesa de estos áridos reciclados en el diseño de hormigones con fines estructurales. Los áridos reciclados empleados proceden de una planta de gestión de residuos de Extremadura que son caracterizados a nivel de laboratorio para determinar sus propiedades. Posteriormente, son diseñados los nuevos hormigones evaluando sus prestaciones físicas en estado fresco y mecánicas en estado endurecido. Resultado de este trabajo, se observa que la utilización simultánea de los áridos reciclados de hormigón no afecta significativamente a las propiedades en estado fresco ni a las propiedades mecánicas.

[EN]: Waste generation is inevitable in any line of business. In 2014, the construction industry generated on the order of 840 million tons of waste in the European Union, accounting for 35% of the EU total. Such vast quantities of waste must be correctly managed and their inclusion in new material manufacture fostered. In the context of today’s circular economy, the use of recycled aggregate in new concrete has been gradually rising, amounting to 8% in civil engineering in 2014. Spain’s present structural concrete code allows for replacing up to 20% of coarse natural aggregate with crushed recycled concrete. This study analyzed the feasibility of using both fine and coarse recycled aggregate in structural concrete design. The properties of the replacement material used, sourced from a waste management plant in the region of Extremadura, were laboratory determined. New concretes were subsequently designed and their fresh and hardened mechanical performance assessed. The findings showed that the simultaneous use of coarse and fine recycled concrete aggregate had no significant impact on the fresh state or mechanical properties of the resulting concrete.

La investigación han sido posible gracias a las subvenciones recibidas en el proyecto “0008_ECO2CIR_4_E-Proyecto de cooperación transfronteriza para la introducción de la economía ecológica y circular mediante la prevención, mejora del reciclaje, de la gestión y de la valorización de residuos en las regiones de Centro, Extremadura y Alentejo” de la convocatoria INTERREG-POCTEP financiado por el FEDER y las ayudas a los grupos de investigación GR18122 concedidas por el FEDER y la Junta de Extremadura.

Trabajo presentado a la International Conference on Construction Research / Eduardo Torroja: Architecture, Engineering, Concrete (AEC), celebrada en el Instituto de Ciencias de la Construcción Eduardo Torroja (IETCC-CSIC) del 21 al 23 de noviembre de 2018.

Peer reviewed

Country
Spain
Related Organizations
Keywords

Circular economy, Recycled aggregate, Construction and demolition waste, Mechanical behavior

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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
0
Average
Average
Average
Green