recycled concrete aggregates sciencedirect

specializing in the production of large, medium and small concrete mixers, concrete mixing stations, stabilized soil mixing stations and other equipment. It is a heavy industry enterprise integrating R & production and sales.

Recycled concrete aggregates - ScienceDirect

Feb 01, 2005  The recycled concrete aggregates (RCA) are the main components of old concrete and for many reasons there is a need to re-use them. 2. Necessity for the re-use of RCAThe need for the production and use of RCA , , , , , is nowadays very urgent. This subject is considered very important especially for Greece, because there are now suitable ...

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Recycled Concrete Aggregate - an overview ScienceDirect ...

Recycled-concrete aggregates generally have lower specific gravity and higher absorption ratio than normal aggregates, which is due to the high absorption of hardened cement paste and porosity within the recycled concrete aggregates. Absorption values are generally between 3% and 10%, depending on the recycled concrete; this absorption lies ...

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Recycled concrete aggregates - ScienceDirect

The present paper refers to the concrete recycling subject and, more specifically, to a proposal for Greek specifications of recycled concrete aggregates (RCA) with reference to international experience and practice. The existence of Greek specifications of RCA––the European ones will come much later––will help Olympic Games 2004 to be ...

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Recycled Concrete - an overview ScienceDirect Topics

Recycled concrete and masonry (RCM) aggregate can be described as graded aggregate produced from sorted and clean waste concrete and masonry. The RCM material may contain brick, gravel crush rock or other forms of stony materials as blended materials. Class 1B-RCA as per HB 155 (2002) is an RCM aggregate.

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Recycled Aggregate - an overview ScienceDirect Topics

Said Kenai, in Waste and Supplementary Cementitious Materials in Concrete, 2018. Abstract. Construction industry generates huge amounts of debris that needs to be recycled and reused as recycled aggregates (RAs) for partial or total substitution of natural aggregates. Recycling reduces waste and reduces energy consumption and hence contributes to a more sustainable construction industry.

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Consolidating recycled concrete aggregates ... - ScienceDirect

Mar 10, 2019  Recycled concrete aggregates (RCAs) have inferior qualities compared with natural aggregates (NAs) because of a layer of residual cement mortar coated on the surface of the NAs. The porous nature of this residual mortar introduces undesirable properties to the RCAs such as higher water absorption and lower strength. ... ScienceDirect ® is a ...

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Time-dependent and long-term ... - ScienceDirect

Feb 15, 2018  Although recycled aggregate concrete (RAC), which is produced from partial or full substitution of natural aggregates by recycled concrete aggregates, has significant economic and environmental benefits , , , its use has so far been limited in construction industry because of the concerns regarding the inferior quality of recycled aggregate ...

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Durability and surface properties of ... - sciencedirect

1. Introduction. Construction and demolition waste is the most prevalent type of waste in the world (Gálvez-Martos et al., 2018), with recycled concrete making up a majority of this (Monier et al., 2011).The latter is often recycled in concrete as Recycled Concrete Aggregates (RCA) (Poulikakos et al., 2017), but the quality of the new concrete is limited (Bogas et al., 2016) due to the ...

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(PDF) Shear strength of recycled aggregates concrete

In this paper, shear strength of fiber reinforced recycled concrete was investigated. A Self Consolidated Concrete (SCC) matrix with 100% coarse recycled aggregate and different types of fibers ...

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Spherical discrete element model for ... - sciencedirect

Crushed vs. pea gravel are two distinct but widely used aggregates in producing pervious concrete. Based on the authors’ initial trial mixtures of pervious concrete, crushed basalt pervious concrete mixtures were less compactible and generated higher porosity than pea gravel pervious concrete mixtures.

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Properties of recycled aggregate concrete made with ...

Duan, Z.H., and Poon, C.S. (2014), "Properties of recycled aggregate concrete made with recycled aggregates with different amounts of old adhered mortars". Materials and Design , Vol.

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Pervious Concrete Block with Recycled Aggregate

S Poh, P Zhao, "Characterization of pervious concrete with blended natural aggregate and recycled concrete aggregates", sciencedirect 2017. Recommended publications. Discover more. Article.

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(PDF) Durability and surface properties of low-noise ...

Aug 01, 2021  replaced by recycled concrete aggregates (RCA), an abundant construction waste. The aggregate replacement was conducted by fractions of 2/4 and 0.125/2 mm corresponding to

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(PDF) Influence of recycled concrete aggregates on ...

The compressive and splitting tensile strengths of concrete. made with recycled coarse aggregate depend on the mix proportions. In general, the strength of recycled. concrete can be 10–25% lower ...

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An Experimental Study on Replacement of Coarse Aggregate ...

P.Pooja, Manendra Vaitla, Gudapati Sravan, et. al. Study on Behavior of Concrete with Partial Replacement of Fine Aggregate with Waste Plastics, ScienceDirect Materials Today: Proceedings 8. 2019; 8: 182–187p.

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(PDF) Micro-structural analysis of recycled concretes made ...

Jalilifar and Sajedi studied the microstructure of 100% recycled concrete with recycled coarse aggregates, after 180 days of hydration, the results showed that the concrete that was not replaced ...

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(PDF) Influence of fine recycled concrete aggregates on ...

Fine recycled concrete aggregates (FRCA) also called recycled sand, having particle sizes smaller than. 5 mm, are essentially composed of mortar and hardened cement paste. Therefore they induce a ...

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Recycled Aggregate Concrete - SlideShare

Nov 15, 2014  What Is Recycle aggregate concrete. 6. Characteristics of recycle aggregate concrete Recycle aggregate concrete has a Crushed sound and clean waste concrete of at least 95% by weight of concrete with typical total contamination lower than 1% of the bulk mass Class 1A RCA is a well graded RCA with no more than 0.5% brick content. 7.

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Recycled aggregate concrete - SlideShare

Nov 15, 2017  Due to this the recycled aggregates of size 10mm to 20mm are obtained. These recycled aggregates are wet they are dried by keeping in oven for 24 days. The different tests are carried out on finally obtained recycled aggregates and Mix design of concrete of grade M20 by using IS 1260:2009 and 456:2000. 8.

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Influence of fly ash as a cement addition on the hardened ...

Oct 19, 2007  The effects of the use of Class F fly ash as a cement addition on the hardened properties of recycled aggregate concrete were determined. In this study, four series of concrete mixtures were prepared with water-to-cement (w/c) ratios of 0.55, 0.50, 0.45 and 0.40. The recycled aggregate was used as 0%, 20%, 50% and 100% replacements of coarse natural aggregate. Furthermore, fly ash was employed ...

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Control of effective water in recycled aggregate concrete ...

Abstract Composed of several components (natural aggregates and attached cement paste), crushed concrete aggregates (CCA) are not widely recommended in new concrete formulations. Their properties considerably complicate the determination of effective water in fresh concrete. The evolution of effective water in fresh concrete during mixing was studied using an original method based on the power ...

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Waste and Byproducts in Cement-Based Materials - 1st Edition

Jun 03, 2021  Waste and By-Products in Cement-Based Materials: Innovative Sustainable Materials for a Circular Economy covers various recycled materials, by-products and wastes that are suitable for the manufacture of materials within the spectrum of so-called cement-based materials (CBM). Sections cover wastes for replacement of aggregates in CBM, focus on the application of wastes for the replacement of ...

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Shear strength of recycled concrete beams

Tests have been performed on recycled aggregates and on two concrete mixes (conventional concrete and recycled concrete with 50% of recycled coarse aggregates). For every concrete, four reinforced beams with different amount of transverse reinforcement were made and were tested to failure. The results showed that whereas the deflections and the ...

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Spherical discrete element model for ... - sciencedirect

Crushed vs. pea gravel are two distinct but widely used aggregates in producing pervious concrete. Based on the authors’ initial trial mixtures of pervious concrete, crushed basalt pervious concrete mixtures were less compactible and generated higher porosity than pea gravel pervious concrete mixtures.

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Control of effective water in recycled aggregate concrete ...

Abstract Composed of several components (natural aggregates and attached cement paste), crushed concrete aggregates (CCA) are not widely recommended in new concrete formulations. Their properties considerably complicate the determination of effective water in fresh concrete. The evolution of effective water in fresh concrete during mixing was studied using an original method based on the power ...

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MIX DESIGN PROCEDURE FOR RECYCLED AGGREGATE CONCRETE

mix design procedure for recycled aggregate concrete Conservation of natural resources and preservation of environment is the essence of any development. Use of recycled aggregate concrete (RAC) is one such attempt and is an answer to some of the problems in constructional engineering.

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Cement Concrete Composites

The literature review has shown that recycled aggregate con-crete (RAC) tendsto exhibitgreatercarbonationthana correspond-ing natural aggregate concrete (NAC), and that the magnitude of the difference depends on several factors related to the use of RA that are discussed in the following sections. 3.1. Recycled aggregate replacement ratio

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Mechanical properties modeling of recycled aggregate concrete

Results of concrete compressive strength and elastic modulus were statistically analyzed and modeled. The study shows that for both concrete properties, recycled coarse aggregate was more influential than recycled fine aggregate. However, the use of fine recycled red ceramic increased concrete strength.

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Mechanical Properties of Recycled Aggregate Concrete Under ...

Mechanical Properties of Recycled Aggregate Concrete Under Uniaxial Loading. To effectively recycle concrete, it is necessary to use waste concrete as recycled aggregates for new concrete. This article reports on a study in which the compressive strength and the stress-strain curve (SSC) of recycled aggregate concrete (RAC) with different ...

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Influence of fly ash as a cement addition on the hardened ...

Oct 19, 2007  The effects of the use of Class F fly ash as a cement addition on the hardened properties of recycled aggregate concrete were determined. In this study, four series of concrete mixtures were prepared with water-to-cement (w/c) ratios of 0.55, 0.50, 0.45 and 0.40. The recycled aggregate was used as 0%, 20%, 50% and 100% replacements of coarse natural aggregate. Furthermore, fly ash was employed ...

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Shear strength of recycled concrete beams

Tests have been performed on recycled aggregates and on two concrete mixes (conventional concrete and recycled concrete with 50% of recycled coarse aggregates). For every concrete, four reinforced beams with different amount of transverse reinforcement were made and were tested to failure. The results showed that whereas the deflections and the ...

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Waste and Byproducts in Cement-Based Materials - 1st Edition

Jun 03, 2021  Waste and By-Products in Cement-Based Materials: Innovative Sustainable Materials for a Circular Economy covers various recycled materials, by-products and wastes that are suitable for the manufacture of materials within the spectrum of so-called cement-based materials (CBM). Sections cover wastes for replacement of aggregates in CBM, focus on the application of wastes for the replacement of ...

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Advances in Construction and Demolition Waste Recycling ...

Feb 10, 2020  10. Recycled aggregates (RAs) for roads 11. Recycled aggregates (RAs) for asphalt materials 12. Self-compacting concrete with recycled aggregates 13. The suitability of concrete using recycled aggregates (RAs) for high-performance concrete 14. Influence of curing conditions on recycled aggregate concrete 15. Long term performance of recycled ...

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Properties of self-compacting concrete prepared with ...

Properties of self-compacting concrete prepared with coarse recycled concrete aggregate. Self-compacting concrete has significant environmental advantages in comparison to the vibrated concrete: absence of noise and vibrations during installing provides a healthier working environment.

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Rheological behaviour of concrete made with fine recycled ...

The most common types of aggregates used in the construction sector are crushed rock from quarries (49%), natural gravel and sand from pits (41%), recycled aggregates from construction and

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Experimental study on fatigue bond behaviour between ...

Feb 08, 2021  Experimental study on fatigue bond behaviour between basalt fibre-reinforced polymer bars and recycled aggregate concrete. The bond performance between fibre-reinforced polymer (FRP) bars and recycled aggregate concrete (RAC) affects their combined working ability and further influences the bearing capacity and deformation resistance of FRP bar-reinforced RAC structures.

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cone crusher concrete recycling

Cone Crusher Concrete Recycling. Astec kodiak 174 cone crushers astec,concrete recycling concrete is one of the most recycled materials in the world that can be repurposed several times over. once the existing concrete is demolished or torn up, it needs to be processed for accurate shaping and sizing using a

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