Using fine recycled concrete aggregate for mortar production

Neno, Catarina; Brito, Jorge de; Veiga, Rosário

doi:10.1590/s1516-14392013005000164

Cited by 151 publications

(129 citation statements)

References 12 publications

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“…Neno et al (19) found that the incorporation of 100% fine RCA resulted in a compressive strength improvement of 48.3% at 28 days of age, whereas in this study the total replacement of NA by fine RCA resulted in a decrease of 20.9%. Ledesma et al (20) described in detail the reasons for these differences.…”

Section: Compressive Strength Of Hardened Mortarcontrasting

confidence: 55%

“…Martínez et al (17) found lower densities in mortars manufactured with RA from CDW. Neno et al (19) showed a similar trend, although in that case the authors found a small increase with a 20% replacement ratio. The maximum losses observed by Neno et al (19) and in this study were similar (9.0% vs. 8.7%).…”

Section: Dry Bulk Density Of 28-day Hardened Mortarmentioning

confidence: 70%

“…Neno et al (19) showed a similar trend, although in that case the authors found a small increase with a 20% replacement ratio. The maximum losses observed by Neno et al (19) and in this study were similar (9.0% vs. 8.7%). Ledesma et al (20) found slight increases with replacement ratios of up to 10% and decreases with replacement ratios of up to 20%.…”

Section: Dry Bulk Density Of 28-day Hardened Mortarmentioning

confidence: 70%

“…Ledesma et al (20) described in detail the reasons for these differences. The most significant reason is that Neno et al (19) used fine RCA from selected concrete blocks (class 30/37) manufactured in the laboratory and crushed at early ages; therefore, the amount of non-hydrated cement was probably higher than in the recycled aggregates used in this study. Ledesma et al (20) demonstrated that replacement ratios of NA by fine RCA up to 40% did not affect the mechanical properties of M-5 masonry mortar.…”

Section: Compressive Strength Of Hardened Mortarmentioning

confidence: 94%

“…Neno et al (19) showed that fresh bulk density decreased linearly as the content of RCA increased. These authors did not observe a higher fresh bulk density in mixes with low replacement rates of NA by fine RCA.…”

Section: Bulk Density Of Fresh Mortarmentioning

confidence: 99%

See 4 more Smart Citations

A proposal for the maximum use of recycled concrete sand in masonry mortar design

Ledesma¹,

Jiménez²,

Ayuso³

et al. 2016

Mater. construcc.

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Natural sand mining from rivers and seashores is causing serious environmental problems in many parts of the world, whereas the fine fraction from recycling concrete waste is underutilized as a construction material. The aim of this paper is to determine the maximum replacement level of natural sand by recycled sand in the manufacturing of masonry mortar (M-10). For this purpose, five replacement levels were tested: 0%, 25%, 50%, 75% and 100% by volume. The mixes were made using cement CEM II/BL 32.5 N in a volumetric proportion of cement-to-aggregate of 1:5. A commercial admixture was used at a constant content. The amount of water was variable to achieve a consistency of 175±10 mm. The short-and long-term mortar properties were evaluated. The data were analyzed using a one-way ANOVA. In conclusion, a maximum percentage of 50% recycled concrete sand can be used in an indoor environment. RESUMEN: Propuesta de máximo uso de arena reciclada de hormigón en el diseño de morteros de albañilería.La extracción de arena natural de ríos y costas está provocando graves problemas ambientales en muchas partes del mundo, mientras que la fracción fina de los áridos reciclados de residuos de hormigón está infrautilizada como material de construcción. El objetivo de este artículo es determinar el máximo porcentaje de sustitución de arena natural por arena reciclada en la fabricación de morteros M-10. Cinco niveles de sustitución en volumen fueron ensayados: 0%, 25%, 50%, 75% y 100%. Las mezclas fueron hechas con cemento CEM II/BL 32,5 N en una relación volumétrica cemento-árido de 1:5. Se utilizó un aditivo comercial a dosis constante. El agua se ajustó experimentalmente para conseguir una consistencia de 175±10 mm. Se evaluaron las propiedades de los morteros a corto y largo plazo. Los datos se analizaron mediante una ANOVA-simple. En conclusión, un porcentaje máximo del 50% de arena reciclada de hormigón puede usarse en interiores.

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Section: Compressive Strength Of Hardened Mortarcontrasting

confidence: 55%

Section: Dry Bulk Density Of 28-day Hardened Mortarmentioning

confidence: 70%

Section: Dry Bulk Density Of 28-day Hardened Mortarmentioning

confidence: 70%

Section: Compressive Strength Of Hardened Mortarmentioning

confidence: 94%

Section: Bulk Density Of Fresh Mortarmentioning

confidence: 99%

See 3 more Smart Citations

A proposal for the maximum use of recycled concrete sand in masonry mortar design

Ledesma¹,

Jiménez²,

Ayuso³

et al. 2016

Mater. construcc.

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Characterization of recycled sands and aggregates from selective separation

Vargas‐Serrano,

Tian,

Mikanovic

et al. 2023

ce papers

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The use of recycling materials from demolished concrete as raw material for structural application represents an opportunity for decreasing the consumption of primary raw materials and waste generation, thus increasing global sustainability. However, this potential is nowadays not fully exploited due to standards limitations and concerns from the construction industry about the negative effect of the recycled sand in the fresh and hardened concrete performance. Thus, most of the recycled sand produced is only reused as roadbed or dumped in the landfill, whereas the recycled coarse aggregate is commonly downcycled when used for lower‐grade applications.This paper presents an overview of the quality properties of recycled materials obtained through advanced recycling technologies designed to separate high‐quality sand and coarse aggregates from hardened cement paste in demolished concrete. The study focuses on evaluating the selective separation technologies implemented in various industrial pilots and examining how the properties of recycled sands and aggregates compare to those of virgin materials of good quality, and their impact on performance.The test results indicate that there is a strong link between recycled sand quality and its effect on workability and strength development of cement‐based materials. This study also identifies critical aggregate parameters based on which one can come up with realistic replacement levels of natural with recycled sands and aggregate without compromising performance in fresh and hardened state. Our intention is to provide sufficient evidence to specifiers and designers that good quality recycled sands can be used in larger amounts in structural concrete.

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High‐performance concrete with fine recycled concrete aggregate: Experimental assessment

Pavlů

Fořtová

Mariaková

et al. 2022

Structural Concrete

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High‐performance concrete (HPC) is a cement‐based material with excellent properties and durability which determines high‐level structural utilization. However, the necessity of high‐quality natural resources such as quartz powder and sand and a high amount of cement and silica fume and reinforcement by fibers causes a high environmental footprint and costs. One of the possible ways to reduce the environmental footprint and cost of the HPC/UHPC is to replace the powder or sand with secondary raw materials. In this study, the two types and three fractions of fine recycled concrete aggregate (fRCA) are used as supplementary materials in HPC. The reference mixture is based on the UHPC mixture without reinforcement to find out the influence of aggregate replacement. The properties of fresh and hardened concrete are examined. The results show a slight decline of mechanical properties however the autogenous shrinkage decrease with the replacement of natural aggregate by fRCA, which shows the possibilities of natural resources savings and thus leads to a lower environmental footprint of concrete structures as a contribution to the solution of sustainable development goals set by the United Nations in 2015 as an action plan up to 2030.

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Using fine recycled concrete aggregate for mortar production

Cited by 151 publications

References 12 publications

A proposal for the maximum use of recycled concrete sand in masonry mortar design

A proposal for the maximum use of recycled concrete sand in masonry mortar design

Characterization of recycled sands and aggregates from selective separation

High‐performance concrete with fine recycled concrete aggregate: Experimental assessment

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