Proportioning, Microstructure and Fresh Properties of Self-compacting Concrete with Recycled Sand

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

doi:10.1016/j.proeng.2017.01.401

Cited by 33 publications

(21 citation statements)

References 16 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%

“…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 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].…”

Section: Compositionmentioning

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%

“…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 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].…”

Section: Compositionmentioning

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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“…Obtaining cement-based materials made with RA (obtained from the treatment of C&DWs) has been one of the most studied applications. Although, indeed, there are currently some reliable studies that support the use of C&DW in conventional concrete [ 16 , 17 , 18 , 19 , 20 , 21 , 22 ], in recent years some studies on the use of RA have begun to be published with self-compacting concrete (SCC), although they are still rare [ 23 , 24 , 25 , 26 , 27 , 28 , 29 , 30 , 31 , 32 , 33 , 34 , 35 , 36 , 37 , 38 , 39 ]. Most of these studies compare the various fresh and hardened properties of SCC with RA and without RA (natural aggregates), apart from SCC mix design.…”

Section: Introductionmentioning

confidence: 99%

Influence of Design Parameters on Fresh Properties of Self-Compacting Concrete with Recycled Aggregate—A Review

Martínez‐García

Jagadesh²,

Fraile‐Fernández

et al. 2020

Materials

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This article presents an overview of the bibliographic picture of the design parameter’s influence on the mix proportion of self-compacting concrete with recycled aggregate. Design parameters like water-cement ratio, water to paste ratio, and percentage of superplasticizers are considered in this review. Standardization and recent research on the usage of recycled aggregates in self-compacting concrete (SCC) exploit its significance in the construction sector. The usage of recycled aggregate not only resolves the negative impacts on the environment but also prevents the usage of natural resources. Furthermore, it is necessary to understand the recycled aggregate property’s role in a mixed design and SCC properties. Design parameters are not only influenced by a mix design but also play a key role in SCC’s fresh properties. Hence, in this overview, properties of SCC ingredients, calculation of design parameters in mix design, the effect of design parameters on fresh concrete properties, and the evolution of fresh concrete properties are studied.

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“…It was revealed that the using of recycled concrete aggregate (RCA) affects the workability of fresh concrete negatively, where recycled aggregate concrete (RAC) has higher slump loss than the natural aggregate (NA) concrete [1][2][3], which is mainly due to the aggregate itself where the size, texture, shape and water content of aggregate have a high effect on the fresh priorities [4][5][6]. Fresh properties or workability defined in ACI as that property of freshly mixed concrete or mortar that determines the ease with which it can be mixed, placed, consolidated, and finished to a homogenous condition [7].…”

Section: Introductionmentioning

confidence: 99%

Fresh properties of the selfcompacting high-performance concrete using recycled concrete aggregate

Abed¹,

Nemes²

2019

Epitoanyag - JSBCM

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The present study is investigating the fresh properties of the self-compacting high-performance concrete (SCHPC) using recycled concrete aggregate and waste powder materials. Twenty-one mixtures with the same water to binder ration have been tested for both slump flow and V-funnel tests. Their results shows that using recycled concrete aggregate (RCA) up to 50% is not affecting the workability of SCHPC if the water absorption of RCA is compensated, however, waste powder materials are affecting the fresh properties negatively and demanded higher dosage of chemical admixture. Their effect differentiates depending on the grading and particles properties of the waste powder material. The workability results of SCHPC using recycled aggregate and waste powder materials are satisfying the workability process of normal SCC, which is specified in the European Guideline for Self-compacting Concrete regulations (EFNARC).

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Proportioning, Microstructure and Fresh Properties of Self-compacting Concrete with Recycled Sand

Cited by 33 publications

References 16 publications

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

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

Influence of Design Parameters on Fresh Properties of Self-Compacting Concrete with Recycled Aggregate—A Review

Fresh properties of the selfcompacting high-performance concrete using recycled concrete aggregate

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