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Properties of concrete with recycled aggregates

Jan 01, 2013  Properties of fresh concrete using recycled aggregates The use of RA has an important influence on fresh concrete properties, particularly affecting its workability. The high absorption properties of these aggregates, in addition to their heterogeneity, make it harder to adjust and control the consistency of the concrete. 12.2.1.

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Properties of recycled concrete aggregate and their

Jun 01, 2018  Using RCA in concrete preserves the environment by reducing the need for opening new aggregate quarries and decreases the amount of construction waste that goes into landfill. The properties of RCA such as specific gravity, absorption, and the amount of contaminant present in it contribute to the strength and durability of concrete.

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Properties of concrete made with recycled aggregate

May 01, 2003  The properties of the concrete made with recycled aggregates were inferior to those of concrete made with virgin aggregates. Effects of crushing age were moderate: concrete made with aggregates crushed at age 3 days exhibited better properties than those made with aggregates of the other crushing ages, when a strong cement matrix was used.

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Mechanical Properties of Concretes with Recycled

Jan 01, 2017  All concretes are dosed for a compressive strength of 30 MPa. The recycled aggregates are obtained from prefabricated pipe debris with a compressive strength of 20 MPa. The waste bricks are obtained from construction demolitions. Four levels of replaced cement by waste brick powder are considered: 0%, 5%, 10% and 15%.

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Properties of recycled aggregate concrete made with

Jun 01, 2014  Four concrete mixes (one with natural aggregate and three others with recycled aggregates) with 28 day target compressive strength varying from 30 MPa to 80 MPa are designed by using each RA to fully replace NA. The properties of RAC are also modeled by using the artificial neural networks ( ANN) method.

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Recycled Concrete Aggregates – Its Uses, Properties,

Aug 18, 2020  History. Recycled concrete aggregates or Crushed concrete aggregates has been in use since the ancient times, only to be integrated with gravel, sand, and cement to ensure durability. The practice was first recorded in the 1860s. US construction companies were reluctant to use the technique at first since crushing cured concrete proved to be much more cost

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Properties of concrete containing recycled concrete

Oct 30, 2016  RCA also has an effect on the fresh properties of concrete. The greater angularity, surface roughness, absorption and porosity contribute to the decrease in workability of fresh RCA concrete. The rapid loss in workability can be attributed to the increase in fines during the mixing process.

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Properties of Permeable Concrete Made by Recycled Aggregates

Apr 05, 2019  Compressive strength of porous concrete made by replacing 25, 50, 75, and 100% of natural coarse aggregates by recycled coarse aggregates comes out to be 94.41, 85.28, 73.96, and 58.11% of porous concrete made with natural aggregates. 2.

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Fresh properties of recycled aggregate concrete

Feb 10, 2020  Fresh properties of normal consistency concrete with coarse recycled aggregate (CRA) • Behaviour of concrete with different CRA crushing levels, w/c, and paste volume. • Testing concrete for slump, flow table, inverted cone, Vebe, bulk density, and air content. • Assessment of concrete’s workability loss overtime. •

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Mechanical properties of concrete with recycled

May 18, 2016  The combination of both recycled materials permits an increased amount of recycled coarse aggregates reducing the loss of mechanical performance of the concrete, and enhances the environmental value of the final material.

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PROPERTIES OF CONCRETES WITH RECYCLED AGGREGATES:

In addition, it was clear that recycled aggregate concrete can provide strength equivalent to the corresponding concrete with conventional aggregates, providing the cement content increased, typically by 7.2 % for 40 MPa concrete. The recycled aggregate concretes exhibited 20% lower modules of elasticity than the natural aggregate concrete.

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Mix Design and Properties of Recycled Aggregate Concretes ...

Aug 26, 2014  This work is devoted to the study of fresh and hardened properties of concrete containing recycled gravel. Four formulations were studied, the concrete of reference and three concretes containing recycled gravel with 30, 65 and 100 % replacement ratios. All materials were formulated on the basis of S4 class of flowability and a target C35 class of compressive

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PROPERTIES OF CONCRETES WITH RECYCLED AGGREGATES:

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Properties of Plain Concrete Produced Employing Recycled Aggregates

Jul 10, 2017  The 100% substitution of natural aggregates (>10 mm) for recycled aggregates produced a decrease in concrete density of 9%, while concretes with 50 and 25% showed dry-density drops of 4 and 2%, respectively. Concrete density is highly dependent on the density of the recycled aggregates used, a fact which has been stated by several authors [3, 8].

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Mechanical Properties of Recycled Aggregate Concretes

The model for steel fibre-reinforced concrete containing natural aggregates agrees well with the ascending branch of the stress-strain curve for all recycled aggregates concretes. However, a slight variation in the post-peak behaviour between the model predicted and the experimentally observed curve for recycled aggregates concretes can be seen.

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Crushed Concrete Aggregates - Properties and Uses of Recycled ...

Water absorption of recycled aggregate influence both fresh and hardened concrete properties. Recycled sand will be avoided, due to its absorption capacity, which would no doubt produce a shrinkage effect. Workability of recycled aggregate concretes is affected by the absorption capacity of the recycled aggregates. 5. Los Angeles Abrasion Loss

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Mechanical and Durability Properties of Recycled Aggregate Concrete ...

Nov 28, 2017  This paper presents a study on mechanical and durability properties of concretes manufactured with recycled aggregates of different sizes and contents. A total of 14 batches of RACs were manufactured.

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Influence of recycled concrete aggregates on strength properties

Feb 01, 2009  Properties of recycled aggregate concretes as affected. by admixtures in original concretes. ACI J 1984;81(1):21–6. [7] Tavakoli M, Soroushian P. Strengths of recycled aggregate concrete made using.

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Toward the Development of Sustainable Concretes with Recycled

Sep 09, 2018  Recycled concrete aggregate, which is obtained from CD waste, is currently being considered as an alternative aggregate for structural concrete. Recycled aggregate concrete (RAC), an ecofriendly concrete produced by partial or full substitution of natural aggregates with recycled concrete aggregates in a concrete mix, has drawn much attention ...

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Mechanical and Durability Properties of Recycled Aggregate

The use of recycled concrete aggregates as an alternative aggregate material in concrete has been studied over the past two decades. It is now recognized that the recycled aggregate concrete (RAC), where natural aggregates are replaced with recycled concrete aggregates, is a promising technology for conserving natural resources and reducing the environmental impact

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Analysis of the thermal behavior of rubber concrete at elevated ...

A reference concrete without rubber aggregates and concretes with different percentages of rubber aggregates. The quantity of used cement is around 470 kg/m 3 and the Water/cement ... The initial properties of the studied concretes are the following:-The values of the density are 2330, 2212, ... Recycled aggregate concrete: localized failure ...

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Impact of Recycled Aggregate on the Mechanical and

Feb 28, 2022  Referring to the tensile strength, recycled aggregates with less attached mortar can be used as a substitute of natural aggregate, producing a concrete with a similar or even better performance . In fact, it has been confirmed that a smoother surface of the recycled aggregates leads to better tensile properties .

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Materials Free Full-Text Effect of Aggregate Type on Properties

Jun 14, 2022  In this work, we present an analysis of natural fine aggregatesrsquo; influence on the properties of ultra-high-strength concrete. The reference concrete mix was made of natural sand with the addition of fly ash and microsilica. It was assumed to obtain concrete with a very high strength without the addition of fibers and without special curing conditions, ensuring

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Properties and applications of recycled aggregates LZZG

Jun 20, 2022  The construction waste recycled aggregate grass planting brick has the characteristics of rich patterns, beautiful appearance, reducing radiation, reducing heat, preserving humidity, improving the environment, permeable and breathable, protecting flowers and numbers, being easy to rectify, and being economical and practical. It is suitable for ...

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PROPERTIES OF CONCRETES WITH RECYCLED AGGREGATES: INFLUENCE

In addition, it was clear that recycled aggregate concrete can provide strength equivalent to the corresponding concrete with conventional aggregates, providing the cement content increased, typically by 7.2 % for 40 MPa concrete. The recycled aggregate concretes exhibited 20% lower modules of elasticity than the natural aggregate concrete.

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PROPERTIES OF CONCRETES WITH RECYCLED AGGREGATES:

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Table 2 Properties of recycled concrete aggregates (RCA)

Freshly crushed, non-carbonated concrete material is extremely alkaline, with a pH upwards of 13 standard units. The concrete material pH is inversely related to the materials’ degree of ...

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Recycled Concrete Aggregate Introduction, Uses, Properties ...

a. It delivers a low-cost alternative solution to thrashing natural raw materials. b. Recycled concrete aggregate creates projects sustainable. c. Concrete constructed with crushed concrete aggregate has a less carbon footprint. d. It decreases the natural aggregate shortage. e. Bears less energy than mining new.

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Recycled Concrete Aggregates: Its Classification, Properties Uses

Mar 01, 2021  After that, it is broken into smaller pieces to produce aggregates which is known as recycled concrete aggregates. It is also known as crushed concrete aggregates. These are available in size of 20mm to 50mm. RCA concrete type had compressive strength up to 22% greater than the natural aggregate concrete. Recycled Concrete Aggregates.

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Mechanical and Durability Properties of Recycled Aggregate

The use of recycled concrete aggregates as an alternative aggregate material in concrete has been studied over the past two decades. It is now recognized that the recycled aggregate concrete (RAC), where natural aggregates are replaced with recycled concrete aggregates, is a promising technology for conserving natural resources and reducing the environmental impact

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Mechanical Properties and Durability Performance of Recycled Aggregate ...

Feb 26, 2022  The results revealed that the workability and mechanical properties of the recycled aggregate concrete can be used for structural applications when 5% of crumb rubber are used to replace recycled aggregates. ... 15% and 20% of crumb rubber, respectively, for rubber recycled aggregate concretes. Open in a separate window. Figure 7. Influence of ...

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Some Mechanical Properties of Normal and Recycled Aggregate Concretes

This paper describes an experimental study conducted to investigate the properties of concretes produced with recycled aggregates and normal aggregates for two different concrete classes (C20/25, C30/37). Tests of compressive strength, splitting tensile strength, ultrasonic pulse velocity, rebound hammer, wet and dry density and freeze-thaw resistance

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Toward the Development of Sustainable Concretes with Recycled

Sep 09, 2018  Recycled concrete aggregate, which is obtained from CD waste, is currently being considered as an alternative aggregate for structural concrete. Recycled aggregate concrete (RAC), an ecofriendly concrete produced by partial or full substitution of natural aggregates with recycled concrete aggregates in a concrete mix, has drawn much attention ...

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Some mechanical properties of normal and recycled

The compressive strength of recycled aggregate concrete tends to be lower than that of virgin aggregate concrete at low w/c ratios. At higher w/c ratios, the compressive strength of recycled aggregate concrete is similar to that of virgin aggregate concrete. Jeong [7] used concrete structures at Chicago's O'Hare Airport to study recycled coarse ...

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Properties of concretes produced with waste concrete aggregate

Aug 01, 2004  While experimenting with fresh and hardened concrete, mixtures containing recycled concrete aggregates in amounts of 30%, 50%, 70%, and 100% were prepared. Afterward, these mixtures underwent ...

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Sustainable Construction: Use of Recycled Concrete Aggregate

Jul 07, 2015  ABSTRACT: This paper describes two laboratory based experimental studies to determine some plastic and hardened properties of concrete incorporating recycled concrete aggregates. One study examines the effects that the cleanliness of recycled coarse aggregate particles has on the concrete properties, where cleanliness relates to the amount of cement

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Some mechanical properties of normal and recycled aggregate concretes

This paper describes an experimental study conducted to investigate the properties of concretes produced with recycled aggregates and normal aggregates for two different concrete classes (C20/25, C30/37). Tests of compressive strength, splitting ... This paper describes an experimental study conducted to investigate the properties of concretes ...

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