Concretes with aggregates from demolition waste and silica fume. Materials and mechanical properties

González-Fonteboa, Belén; Martínez-Abella, Fernando

doi:10.1016/j.buildenv.2007.01.008

Cited by 215 publications

(83 citation statements)

References 8 publications

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“…Aiming at improving the performance of RAC, other researchers have examined the utilization of ne and ultra ne reactive cementitious materials such as y ash, ground granulated blast furnace slag, and silica fume in RAC [1,5,10,[12][13][14]. It is reported that these materials help to improve the performance of RAC due to the pozzolanic reaction and the lling ability resulting in a dense microstructure and strong ITZ [1,9,10].…”

Section: Introductionmentioning

confidence: 99%

Feasibility of Using Nanoparticles of SiO₂ to Improve the Performance of Recycled Aggregate Concrete

Younis

Mustafa

2018

Advances in Materials Science and Engineering

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e aim of this paper was to examine the feasibility of using nanoparticles of SiO 2 (nanosilica) to improve the performance of recycled aggregate concrete (RAC) containing recycled aggregate (RA) derived from processing construction and demolition waste of concrete buildings. e examined properties include compressive strength, splitting tensile strength, and water absorption. e study also includes examining the microstructure of RA and RAC with and without nanoparticles of SiO 2 . In total, nine mixes were investigated. Two mixes with RA contents of 50% and 100% were investigated and for each RA content; three mixes were prepared with three different nanoparticles dosages 0.4%, 0.8%, and 1.2% (by mass of cement). A control mix with natural aggregate (NA) was also prepared for comparison reasons. e results show that nanoparticles of silica can improve the compressive strength, tensile strength, reduce the water absorption, and modify the microstructure of RAC.

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Section: Introductionmentioning

confidence: 99%

Feasibility of Using Nanoparticles of SiO₂ to Improve the Performance of Recycled Aggregate Concrete

Younis

Mustafa

2018

Advances in Materials Science and Engineering

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“…Their physical, mechanical and chemical properties and the standards applied are summarized in Table 1 (Table 1) was determined to be of good quality due to an acceptable level of impurities, except for 1.8% of asphalt. The particle size distribution of both aggregates, shown in Figure 1, was continuous, ensuring that the aggregate would have a positive effect on the workability of the concrete (41). With regard to fines content, RCA had not a high proportion of fine particles.…”

Section: Methodsmentioning

confidence: 96%

“…Gonzalez-Fonteboa and Martinez-Abella (41) showed that lowering the total water content reduces the amount of free water in the mixture and increases resistance. However, an excessive decrease in free water can reduce RC resistance due to the poor hydration of cement particles, which affects the workability of the mix (58).…”

Section: Compressive Strengthmentioning

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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“…In this way, the shape index of recycled and natural coarse aggregate is similar. According to the studies checked (12,38,39,48,53,57,61,97,142,177,178), this index presents a range of values from 0.14 to 0.47 when recycled aggregate is analysed and from 0.19 to 0.58 for natural aggregate. In general, the limit established in the Spanish specification (169) can be fulfilled without any problem.…”

Section: Shape and Particle Size Distributionmentioning

confidence: 99%

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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Concretes with aggregates from demolition waste and silica fume. Materials and mechanical properties

Cited by 215 publications

References 8 publications

Feasibility of Using Nanoparticles of SiO₂ to Improve the Performance of Recycled Aggregate Concrete

Feasibility of Using Nanoparticles of SiO₂ to Improve the Performance of Recycled Aggregate Concrete

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

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

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Concretes with aggregates from demolition waste and silica fume. Materials and mechanical properties

Cited by 215 publications

References 8 publications

Feasibility of Using Nanoparticles of SiO2 to Improve the Performance of Recycled Aggregate Concrete

Feasibility of Using Nanoparticles of SiO2 to Improve the Performance of Recycled Aggregate Concrete

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

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

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Product

Resources

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Feasibility of Using Nanoparticles of SiO₂ to Improve the Performance of Recycled Aggregate Concrete

Feasibility of Using Nanoparticles of SiO₂ to Improve the Performance of Recycled Aggregate Concrete