Influence of water-reducing admixtures on the mechanical performance of recycled concrete

Barbudo, Auxi; Brito, Jorge de; Evangelista, Luís; Bravo, Miguel; Agrela, Francisco

doi:10.1016/j.jclepro.2013.06.022

Cited by 192 publications

(52 citation statements)

References 19 publications

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“…Since then, several authors [42,[49][50][51][52][53][54][55][56], who have used this method, produced RAC mixes with minimum strength loss and equivalent workability to that of the control concrete. This method consists on the use of additional mixing water, which corresponds to the amount absorbed by RA, with the aim of keeping the free water content constant.…”

Section: Influence Of Mixing Proceduresmentioning

confidence: 99%

Comparative analysis of existing prediction models on the creep behaviour of recycled aggregate concrete

Silva

Dhir

2015

Engineering Structures

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Section: Influence Of Mixing Proceduresmentioning

confidence: 99%

Comparative analysis of existing prediction models on the creep behaviour of recycled aggregate concrete

Silva

Dhir

2015

Engineering Structures

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“…Leite 99 proposed the use of a simple water compensation method that can be applied during concrete mixing, as an alternative to pre-saturating RA 24 hours prior to mixing. Since then, several authors 39,40,89,[100][101][102][103][104][105][106] , who have used this method, produced RAC mixes with minimum strength loss and equivalent workability to that of the control concrete, regardless of the replacement level.…”

Section: Influence Of the Mixing Proceduresmentioning

confidence: 99%

Prediction of Chloride Ion Penetration of Recycled Aggregate Concrete

2015

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This paper provides a literature review and analysis of the various influencing aspects related to the use of recycled aggregates, sourced from construction and demolition waste, on the chloride ion penetration of concrete. A statistical analysis on the effect of incorporating increasing amounts of recycled aggregates of different type, size, and class on the chloride ion migration and total charge passed of concrete is also presented. The paper also presents the relationship between these properties and the corresponding compressive strength. The results show strong correlations between these parameters, which are independent of other aspects related to recycled aggregate use and made it possible obtaining a relationship between the values acquired via NT Build 492 and ASTM C1202.

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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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Influence of water-reducing admixtures on the mechanical performance of recycled concrete

Cited by 192 publications

References 19 publications

Comparative analysis of existing prediction models on the creep behaviour of recycled aggregate concrete

Comparative analysis of existing prediction models on the creep behaviour of recycled aggregate concrete

Prediction of Chloride Ion Penetration of Recycled Aggregate Concrete

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

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