Durability performance of concrete with recycled aggregates from construction and demolition waste plants

Bravo, Miguel; Brito, Jorge de; Pontes, Jorge; Evangelista, Luís

doi:10.1016/j.conbuildmat.2014.12.103

Cited by 276 publications

(145 citation statements)

References 26 publications

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“…Las pocas investigaciones que hay sobre su aplicación en hormigones como árido reciclado mixto [1,2,3,4,5] concluyen que la mayoría de las propiedades del hormigón se ven afectadas negativamente, tanto más cuanto mayor es la sustitución de árido. Esto ha hecho que actualmente haya mucha desconfianza y apenas si se recicla, solo se emplea como relleno de zanjas o en firmes de carreteras.…”

Section: -Introducciónunclassified

Valorización como árido reciclado mixto de un residuo de construcción y demolición en la confección de hormigones autocompactantes durables en terrenos con yesos

Jeronimo

Vilches²,

Montero

2018

Libro De Comunicaciones / Livro Das Comunicações

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RESUMENSe ha realizado un estudio para intentar valorizar el residuo de construcción y demolición, RCD, de mayor generación en las plantas de reciclaje para su aplicación como árido reciclado mixto, al no encontrarse contemplado su uso en la normativa española vigente. En primer lugar, se han determinado las propiedades más relevantes relacionadas con su empleo en hormigones y posteriormente, se ha diseñado y confeccionado un hormigón autocompactante empleando la totalidad de este residuo, ajustando la dosificación para conseguir la durabilidad en una clase de exposición ambiental IIb+Qb. Los requisitos de autocompactabilidad se han logrado ensayando una gama de dosificaciones en torno a la preconizada por Okamura, ajustando la cantidad de fíller y las proporciones de arena y grava, intentando emplear la menor cantidad posible de fíller y la mayor proporción de grava. Se ha determinado la resistencia a compresión del HAC finalmente seleccionado y algunas propiedades relacionadas con su durabilidad, como su porosidad, absorción capilar, penetración de agua y especialmente su resistencia al ataque por sulfatos. Los resultados obtenidos permiten afirmar que con este residuo se puede garantizar la autocompactabilidad en el hormigón, conseguir adecuadas resistencias mecánicas y, sorprendentemente, se perciben bastantes indicios de un comportamiento satisfactorio frente a los sulfatos.PALABRAS CLAVE: hormigón autocompactante, árido reciclado mixto, ataque por sulfatos, durabilidad. 1.-INTRODUCCIÓNEl uso del hormigón, sin duda el material de construcción más importante con el que se construyen la mayoría de las obras civiles, conlleva la extracción de gran cantidad de árido natural de las canteras puesto que este componente entra a formar parte en un 75-80% del 579

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Section: -Introducciónunclassified

Valorización como árido reciclado mixto de un residuo de construcción y demolición en la confección de hormigones autocompactantes durables en terrenos con yesos

Jeronimo

Vilches²,

Montero

2018

Libro De Comunicaciones / Livro Das Comunicações

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“…The reason attributed to this is poor Interfacial Transition Zone (ITZ), (Medina et al, 2015). Concrete made with C&D waste aggregates have poor workability and durability performance as compared to natural aggregates concrete (Bravo et al, 2015). For 100% coarse recycled concrete aggregate (RCA) in concrete, Silva et al (2015) reported an increase in shrinkage by up to 80%.…”

Section: Introductionmentioning

confidence: 99%

Workable and Robust Concrete using High Volume Construction and Demolition Waste in Sub Tropical Climate

Yadav¹,

Deo²,

Ramtekkar³

2018

IJTech

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Full fledged use of construction & demolition (C&D) waste in the construction industry is inevitable. Concrete technologists across the world are engaged to scale its properties and potential uses since last 65 years. The general consensus for the mechanical property is to some extent is acceptable however the workability and durability properties are still under a scanner and needs to be improved. The present paper reports the optimistic results of series of experimental work carried out using high range replacement of normal aggregates (NA) with recycled aggregates (RA) (5080%) from C&D waste for producing sustainable and durable concrete (water cement ratio 0.4) using C&D waste. Multiple strategies were used in research to enhance workability and durability properties of concrete produced by using C&D waste. Firstly the RA was used as an internal curing (IC) agent to enhance the micro structure and Interfacial Transition Zone (ITZ) of concrete. Secondly by apparently lowering the water cement ratio by using additional low-lime fly ash similar to class F of ASTM C 618 mainly to improve workability, packing of concrete, later age strength and durability. The results show that water diffusion in concrete with RA being used as an IC agent was delayed leading to decrease in shrinkage and micro cracks development; also increase the hydration, compressive strength and improvement of durability indexes such carbonation depth and electrical resistivity is seen. The Scanning Electron Microscope (SEM) result illustrated the considerable improvement in the microstructure. By adopting these strategies which are economical & sustainable, mixtures show additional benefits that should permit their broader application.

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“…To encourage the usage of construction waste materials, many researchers have executed research on the mechanical characteristics of recycled aggregate (Soares et al 2014a;Tavakoli and Soroushian 1996a;Valeria 2010) and the durability of recycled aggregate (Bravo et al 2015;Ryou and Lee 2014;Sherif et al 2015;Soares et al 2014b). According to the studies of Domingo et al (2009), Gholamreza et al (2011), Rasiah et al (2012), Tavakoli and Soroushian (1996b), and Xiao et al (2014), the drying shrinkage of RAC is larger than that of NAC.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on Tensile Creep of Coarse Recycled Aggregate Concrete

Seo

Lee

2015

International Journal of Concrete Structures and Materials

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Previous studies have shown that the drying shrinkage of recycled aggregate concrete (RAC) is greater than that of natural aggregate concrete (NAC). Drying shrinkage is the fundamental reason for the cracking of concrete, and tensile creep caused by the restraint of drying shrinkage plays a significant role in the cracking because it can relieve the tensile stress and results in the delay of cracking occurrence. However, up till now, all research has been focusing on the compressive creep of RAC. Therefore, in this study, a uniaxial restrained shrinkage cracking test was executed to investigate the tensile creep properties caused by the restraint of drying shrinkage of RAC. The mechanical properties, such as compressive strength, tensile splitting strength, and Young's modulus of RAC were also investigated in this study. The results confirmed that the tensile creep of RAC caused by the restraint of shrinkage was about 20-30 % larger than that of NAC.

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Durability performance of concrete with recycled aggregates from construction and demolition waste plants

Cited by 276 publications

References 26 publications

Valorización como árido reciclado mixto de un residuo de construcción y demolición en la confección de hormigones autocompactantes durables en terrenos con yesos

Valorización como árido reciclado mixto de un residuo de construcción y demolición en la confección de hormigones autocompactantes durables en terrenos con yesos

Workable and Robust Concrete using High Volume Construction and Demolition Waste in Sub Tropical Climate

Experimental Study on Tensile Creep of Coarse Recycled Aggregate Concrete

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