Proportioning, fresh-state properties and rheology of self-compacting concrete with fine recycled aggregates

Carro-López, Diego; González-Fonteboa, Belén; Martínez-Abella, Fernando; González-Taboada, Iris; Brito, Jorge de; Varela-Puga, Fernando

doi:10.1016/j.hya.2017.04.023

Cited by 16 publications

(19 citation statements)

References 17 publications

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“…The amount of cement and W/C ratio limit values established by EHE-08 were complied with. According to the conclusions of other experimental studies [15,19], the adequate composition is Firstly, the mixer was moistened with water to prevent accumulation. The coarse natural and/or recycled aggregates were added from largest to smallest and later sand was added and then mixed for 10 s. The cement and filler were added and mixed for three minutes, slowly pouring in the mixing water with half of the superplasticizer, with time beginning upon completely pouring in the mixing water.…”

Section: Compositionmentioning

confidence: 99%

“…According to the conclusions of other experimental studies [15,19], the adequate composition is somewhat enhanced and different from the one obtained by the strict use of the Okamura method [51]. Many of the tests consulted use cement contents ranging from 285 kg/m 3 to 440 kg/m 3 and compensating this range of values with more or less fine particles [11,19,26]. Other authors use 52.5 cement since its greater fineness helps with the workability and flow.…”

Section: Compositionmentioning

confidence: 99%

“…All mixes comply with the reference values shown in Table 7, self-compactability criteria. compensating this range of values with more or less fine particles [11,19,26]. Other authors use 52.5 cement since its greater fineness helps with the workability and flow.…”

Section: Self-compactabilitymentioning

confidence: 99%

“…The use of recycled sand is not allowed by the Spanish Instruction for Structural Concrete [31] even though some studies show that substitutions of up to 10% do not produce any significant variations in the characteristics of concrete [15,17,19]. Currently, Instruction EHE-08 allows the partial addition (<20% weight) of coarse recycled concrete aggregates as replacement of natural aggregates.…”

Section: Introductionmentioning

confidence: 99%

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Recycling Aggregates for Self-Compacting Concrete Production: A Feasible Option

et al. 2020

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The use of construction and demolition wastes (C&DW) is a trending future option for the sustainability of construction. In this context, a number of works deal with the use of recycled concrete aggregates to produce concrete for structural and non-structural purposes. Nowadays, an important number of C&DW management plants in the European Union (EU) and other countries have developed robust protocols to obtain high-quality coarse recycled aggregates that comply with different European standards in order to be used to produce new concrete. The development of self-compacting concrete (SCC) is another way to boost the sustainability of construction, due to the important reduction of energy employed. Using recycled aggregates is a relatively recent scientific area, however, studies on this material in the manufacture of self-compacting concrete have proven the feasibility thereof for conventional structural elements as well as high-performance and complex structural elements, densely reinforced structures, difficult-to-access formwork and difficult-to-vibrate elements. This paper presents an original study on the use of coarse recycled concrete aggregate (CRA) to obtain self-compacting concrete. Concrete with substitution ratios of 20%, 50% and 100% are compared with a control concrete. The purpose of this comparison is to check the influence of CRA on fresh SCC as well as its physical and mechanical properties. The parameters studied are material characterization, self-compactability, compressive strength, and tensile and flexural strength of the resulting concrete. The results conclude that it is feasible to use CRA for SCC production with minimal losses in the characteristics.

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Section: Compositionmentioning

confidence: 99%

Section: Compositionmentioning

confidence: 99%

Section: Self-compactabilitymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Recycling Aggregates for Self-Compacting Concrete Production: A Feasible Option

et al. 2020

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“…Recycled aggregates originating from these heterogeneous wastes are frequently considered to be a secondary material of residual value; recycled mixed aggregates are thus commonly destined for backfilling or other low level construction applications, with very restricted use and therefore reduced opportunities for valorization. Some recent studies, however, have demonstrated that recycled aggregates can produce quality concretes inter alia [4,5,6,7,8,9].…”

Section: Introductionmentioning

confidence: 99%

Paving with Precast Concrete Made with Recycled Mixed Ceramic Aggregates: A Viable Technical Option for the Valorization of Construction and Demolition Wastes (CDW)

et al. 2018

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This research aimed to prove the feasibility of producing two types of precast elements widely used in construction, such as curbstones and paving blocks, using recycled concrete made with a 50% substitution of the natural gravel by recycled mixed aggregates with a significant ceramic content (>30%). In order to prove the quality of such mass concrete recycled precast elements, two different mixes were used: the first one was a conventional concrete mix provided by Prefabricados de Hormigón Pavimentos Páramo S.L., one of the collaborating companies in this study, and the other was a mixture in which wt 50% of the natural coarse aggregates were substituted for recycled mixed aggregates ceramic (RMAc). This recycled aggregate is a heterogeneous mixture of unbound aggregates, concrete, ceramic, etc., used as a secondary recycled aggregate and commonly produced in a lot of recycling plants in many European countries. This material was supplied by Tecnología y Reciclado S.L., the other collaborating company. Both mixtures were representative in order to establish the comparative behavior between them, taking into account that smaller percentages of replacement of the natural with recycled aggregates will also produce good results. This percentage of substitution represents a high saving of natural resources (gravel) and maintains a balanced behavior of the recycled concrete, so this new material can be considered to be a viable and reliable option for precast mass concrete paving elements. The characterization of the recycled precast elements, covering mechanical, microstructural, and durability properties, showed mostly similar behavior when compared to the analogous industrially-produced pieces made with conventional concrete.

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Construction and demolition waste as recycled aggregate for environmentally friendly concrete paving

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Gázquez

et al. 2021

Environ Sci Pollut Res

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Recycled aggregates (RA) from construction and demolition waste (CDW) instead of natural aggregates (NA) were analysed in the manufacture of new eco-friendly concrete. Fine (FRA) and coarse (CRA) recycled aggregates were used in different percentages as substitutes of natural sand and gravel, respectively. The results revealed that the use of RA in percentages of up to 50 wt.% is feasible. Additionally, RA were used to produce paving blocks in accordance with industrial requirements. Thus, values of water absorption lesser than 6.0% and tensile strength upper than 3.6 MPa were obtained, which are similar to those of a reference sample and within the limit values established by the regulations. These results were achieved by reducing the incorporation of cement, thereby saving production costs and minimizing environmental impact.

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Proportioning, fresh-state properties and rheology of self-compacting concrete with fine recycled aggregates

Cited by 16 publications

References 17 publications

Recycling Aggregates for Self-Compacting Concrete Production: A Feasible Option

Recycling Aggregates for Self-Compacting Concrete Production: A Feasible Option

Paving with Precast Concrete Made with Recycled Mixed Ceramic Aggregates: A Viable Technical Option for the Valorization of Construction and Demolition Wastes (CDW)

Construction and demolition waste as recycled aggregate for environmentally friendly concrete paving

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