New approach in measuring water absorption of recycled aggregates

Tam, Vivian Wing Yan; Gao, Xinyu; Tam, C. M.; Chan, Chi Hou

doi:10.1016/j.conbuildmat.2006.08.009

Cited by 116 publications

(55 citation statements)

References 9 publications

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“…Studies have been published that determine this property more accurately for CRA 27 . But none were found that address the problems of applying EN 1097-6 to the fine fraction.…”

Section: Introductionmentioning

confidence: 99%

A new method to determine the density and water absorption of fine recycled aggregates

2013

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The construction industry keeps on demanding huge quantities of natural resources, mainly minerals for mortars and concrete production. The depletion of many quarries and environmental concerns about reducing the dumping of construction and demolition waste in quarries have led to an increase in the procuring and use of recycled aggregates from this type of waste. If they are to be incorporated in concrete and mortars it is essential to know their properties to guarantee the adequate performance of the end products, in both mechanical and durability-related terms. Existing regulated tests were developed for natural aggregates, however, and several problems arise when they are applied to recycled aggregates, especially fine recycled aggregates (FRA). This paper describes the main problems encountered with these tests and proposes an alternative method to determine the density and water absorption of FRA that removes them. The use of sodium hexametaphosphate solutions in the water absorption test has proven to improve its efficiency, minimizing cohesion between particles and helping to release entrained air.

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“…Studies have been published that determine this property more accurately for CRA 27 . But none were found that address the problems of applying EN 1097-6 to the fine fraction.…”

Section: Introductionmentioning

confidence: 99%

A new method to determine the density and water absorption of fine recycled aggregates

2013

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“…La mayor absorción de los ARH se debe a la gran absorción que presenta el mortero adherido a éstos (7,(13)(14)(15) …”

Section: Composición De Los Arunclassified

“…The higher absorption on RCA is due to the high absorption of the mortar attached to it (7,(13)(14)(15). Similar results as the ones encountered have been found in different publications (7,(16)(17)(18)(19).…”

Section: Rca Compositionmentioning

confidence: 99%

Diseño de mezclas de hormigón reciclado mediante el método Volumen de Mortero Equivalente (EMV): Validación bajo el contexto español y su adaptación al método de diseño de Bolomey

Jiménez¹,

Aponte²,

Vázquez³

et al. 2012

Mater. construcc.

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A new method for proportioning recycled aggregates concrete (RAC) is used to check its feasibility under the Spanish context. First, an extensive experimental campaign has been done, with the purpose of check and analyze the applicability of the EMV method with two Spanish recycled concrete aggregates (RCA). The aim of the second part of the investigation, was to elaborate an adaptation of the EMV method to Bolomey methodology (1), using a 20% weight replacement of coarse natural aggregates (NA) for RCA, and so, with this, comply with the Spanish Instruction for Structural Concrete (EHE 2008). Slump, air content, fresh and hardened densities, compressive strength and modulus of elasticity were determined and analyzed, in order to check the concrete properties. Finally, it was observed that, the EMV method is viable, and its adaptation, results in concrete mixes with similar or better properties than the natural aggregate concrete and RAC conventionally prepared.Keywords: recycled concrete; recycled aggregate; mix proportioning; mechanical properties; Portland cement.( * ) Universidad Politécnica de Cataluña (Barcelona, España).Persona de contacto / Corresponding author: cristian.jimenez@estudiant.upc.edu RESUMENEl nuevo método para el diseño de hormigón con árido reciclado (HAR) es usado para comprobar su posibilidad de uso bajo el contexto español. Primeramente, se realiza una extensa campaña experimental, para analizar las posibilidades de su aplicación, usando dos áridos reciclados de hormigón (ARH) españoles. En la segunda etapa se elabora una adaptación del método a la metodología propuesta por Bolomey (1), con 20% de reemplazo en peso de árido grueso natural (AN) por ARH, para así cumplir con las recomendaciones estipuladas en la Instrucción de Hormigón Estructural (EHE 2008). Para determinar y analizar las propiedades del hormigón, se llevaron a cabo ensayos de asentamiento, contenido de aire, densidades, módulo elástico y resistencias a compresión. Finalmente, se concluye que el uso del nuevo método es viable, y que su adaptación produce hormigones con similares o mejores características que los elaborados para hormigón con árido convencional (HAC) y HAR convencionales.

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“…Se observa que la granulometría de los cuatro áridos reciclados era similar al árido natural obteniéndose en todos los casos un tamaño máximo de 19 mm. Los áridos obtenidos de escombros de hormigón de peor calidad producen áridos de menor densidad y mayor porciento de absorción tal y como se esperaba de acuerdo a los resultados obtenidos por otros investigadores (26)(27)(28). Por otro lado estos tienen una forma más redondeada.…”

Section: Propiedades De Los áRidos Gruesosunclassified

Estudio de la aplicabilidad del hormigón con árido grueso reciclado en La Habana, Cuba

2012

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RESUMENLos estudios de viabilidad realizados recientemente en La Habana, Cuba, muestran elevadas cifras de producción de residuos de construcción y demolición (RCD). Los últi-mos datos conocidos de generación de escombros de hormigón alcanzan valores cercanos a los 1.800 m 3 /mensual. Esta situación unida al agotamiento de los áridos en las zonas cercanas a la capital hace necesaria la utilización de estos escombros como áridos en la fabricación de hormigones. En el trabajo realizado se trituraron escombros de hormigón de cuatro orígenes diferentes, después de su caracterización se fabricaron hormigones con 25%, 50% y 100% de árido reciclado y con relaciones agua-cemento de 0,45, 0,50 y 0,55. A partir de la evaluación de las propiedades físico-mecánicas y de durabilidad obtenidas por los hormigones reciclados, se define la aplicabilidad de los mismos como hormigón estructural para ser utilizados en los diferentes tipos de ambientes de agresividad que tiene definido la normativa cubana.Palabras clave: residuos, reciclado, áridos, hormigón. SUMMARYThe recent viability studies carried out in Havana, Cuba, according to natural or recycled aggregates, exhibited high volume production of construction and demolition waste (CDW). The last well-known data of concrete waste generation reached to 1800 m 3 /month. This situation, together with the depletion of the quarry aggregates closed to the capital, requires the use of such debris as aggregate for concrete production. In this work, four origin recycled concrete aggregates (RCA) were produced and characterized. Recycled aggregate concrete with 25%, 50% and 100% of RCA and 0.45, 0.50 and 0.55 of water-cement ratio were produced. Physical, mechanical and durabilidty properties of thoses concretes were determined and evaluated, and their applicability as structural material in different aggressive environments according to Cuban normative was defined.

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New approach in measuring water absorption of recycled aggregates

Cited by 116 publications

References 9 publications

A new method to determine the density and water absorption of fine recycled aggregates

A new method to determine the density and water absorption of fine recycled aggregates

Diseño de mezclas de hormigón reciclado mediante el método Volumen de Mortero Equivalente (EMV): Validación bajo el contexto español y su adaptación al método de diseño de Bolomey

Estudio de la aplicabilidad del hormigón con árido grueso reciclado en La Habana, Cuba

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