Strength Variation Of Recycled Fine Aggregate With Crushing And With Out Crushing
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Strength Variation Of Recycled Fine Aggregate With Crushing And With Out Crushing

Strength and durability of concrete containing recycled ...

Recycled concrete aggregates (RCA) sourced from waste concrete are a sustainable alternative to natural crushed stone aggregates. The strength and durability properties of concrete containing RCA were evaluated by a comprehensive experimental investigation involving nine control mixes. The variables considered in the experimental study are water cement ratio, cement content in concrete and ...

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Strength, shrinkage and creep and durability aspects of ...

Oct 01, 2020 · Portland Type I cement confirming to KS L 5201 (See Table 1), 25-mm crushed natural/recycled coarse aggregates and crushed natural/recycled fine aggregates less than 5 mm were used.Recycled aggregates conforming to KS F 2573 were supplied from a commercial producer. The coarse aggregate of old concrete was Andesite, a siliceous aggregate often used in Korea.

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Strength and durability of concrete containing recycled ...

Sep 01, 2018 · The models were proposed by accounting for the effects of water-cement ratio, proportion of recycled fine aggregates and proportion of recycled coarse aggregates in the mix. Zilch and Roos proposed a model to estimate the modulus of elasticity of recycled aggregate concrete from the compressive strength and mass density of concrete. However ...

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Crushed Concrete Aggregates - Properties and Uses of ...

This influenced by strength of crushed concrete, water to cement ratio of crushed and new concrete. For concrete produced from both recycled coarse and fine aggregate is between 15 to 40%. 2. Strength Variations . Strength variation of concrete produced from recycled aggregate is higher than concrete made from natural aggregate.

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A STUDY ON RECYCLED CONCRETE AGGREGATES

abr asion value for recycled aggregate was obtained as 47.4% and that for natural aggregate as 29.6%. Water absorption of recycled aggregate (4.2%) was found to be higher when compared to the natural aggregate (0.4%). It was found that compressive strength of concrete made from the recycled aggregate is about 76% of the strength of concrete

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Influence of the Crushing Process of Recycled Aggregates ...

This work intends to evaluate the (mechanical and durability) performance of concrete made with coarse recycled concrete aggregates (CRCA) obtained using two crushing processes: primary crushing (PC) and primary plus secondary crushing (PSC). This analysis intends to select the most efficient production process of recycled aggregates (RA). The RA used here resulted from precast products (P ...

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Crushing characteristics of a recycled aggregate from ...

A single-particle crushing test was carried out for more than 170 recycled aggregates from waste concrete. Recycled aggregates were sieved into 30- and 40-mm particle size groups, mainly ...

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Durability of concrete containing recycled concrete coarse ...

May 01, 2020 · The recycled aggregates having a maximum particle size of 12.5 mm were obtained by crushing concrete prisms using a jaw crusher (Fig. 1(a)).The concrete prisms were produced approximately 11 months earlier in the Concrete Laboratory in Isfahan University of Technology (IUT) using Type I Portland cement with a target 28-day compressive strength of 30 MPa.

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(PDF) Concrete with fine recycled aggregates: A review

The use of coarse recycled aggregates has been shown to produce concrete with acceptable properties [11][12][13][14][15]. Fine recycled aggregates (FRA), however, have more nefarious ...

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Prediction of compressive strength of recycled aggregate ...

Mar 01, 2013 · The ANN model, run in a Matlab platform, was used to predict the compressive strength of the recycled aggregate concrete. The results show that ANN has good potential to be used as a tool for predicting the compressive strength of recycled aggregate concrete prepared with varying types and sources of recycled aggregates.

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Influence of the Crushing Process of Recycled Aggregates ...

This work intends to evaluate the (mechanical and durability) performance of concrete made with coarse recycled concrete aggregates (CRCA) obtained using two crushing processes: primary crushing (PC) and primary plus secondary crushing (PSC). This analysis intends to select the most efficient production process of recycled aggregates (RA). The RA used here resulted from precast products (P ...

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Influence of Recycled Aggregates on Mechanical Properties ...

involves crushing, removing and separation into various sizes and bulks. Reclaimed ... been found that fine recycled aggregates obtained from recycling concrete are more ... of substitution of natural aggregate by recycled concrete aggregate on the compressive strength of the material. Table 1 shows the mix proportion for the three mixes.

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Shear Strength of Reinforced Concrete Beams Made with ...

50% and 100% treated recycled aggregate. Test results showed that using treated recycled aggregate improved slightly the shear capacity of the beams in comparison with natural and untreated recycled aggregate. Theoretical predictions of the shear strength of the treated recycled aggregate beams were more conservative compared to the natural and

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ISSN 2348 – 7968 Influence of Recycled Coarse Aggregate

obtained from the jaw crusher (termed as combined recycled aggregate, comprising fine and coarse particles), the percentage of fines increased with the number of times the aggregates were crushed. It was also observed that the resulting shape and texture of the aggregates during crushing were greatly dependent on the amount of cement paste ...

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(PDF) Concrete with fine recycled aggregates: A review

The use of coarse recycled aggregates has been shown to produce concrete with acceptable properties [11][12][13][14][15]. Fine recycled aggregates (FRA), however, have more nefarious ...

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Recycling of Concrete (Recycling Coarse Aggregate) – IJERT

Coarse Aggregate: The Coarse aggregate was used as Recycled coarse aggregate (RCA). The specific gravity of the RCA was 2.30. The Fineness modulus was 3.67. Fine Aggregate: Natural river sand was used as fine aggregate. The Specific gravity of Fine aggregate was 2.68. Methods. Fineness Modulus: This test was done with the help of various sieves.

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A Study of Concrete Made with Fine and Coarse Aggregates ...

(ii) The use of fresh concrete waste, after crushing, as recycled fine and coarse aggregates decreases the mechanical performance of the new concrete. (iii) The compressive strength decreases gradually with respect to the increase of the percentage of recycled aggregates. This relationship can be approximated by a polynomial function with .

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Environmental Considerations in Concrete Recycling

Mar 29, 2017 · crushing hardened concrete from an acceptable source. • Old concrete pavements often are excellent sources of material for producing recycled concrete aggregate (RCA). • This webinar focuses primarily on RCA from existing pavements (not mixed C&D waste). 6

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(PDF) Strength studies on glass fiber reinforced recycled ...

In general, the recycled aggregates are found to be weaker than the natural aggregates against mechanical resistance such as aggregate crushing value, ten percent fines value, impact value and Los ...

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(PDF) Partial Replacement of Coarse Aggregates with ...

Jul 29, 2020 · Test results showed that the compressive strength of recycled concrete up to 30% coarse aggregate replacement (C. A. R.) by demolished

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Using fine recycled concrete aggregate for mortar production

Our study focused on the viability of replacing sand with fine recycled concrete aggregate in the production of mortar, i.e. composites made of cement, fine aggregates, water and eventually admixtures and additions, particularly for use as wall coatings and mixed on site for immediate application.

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Recycling Concrete Debris from Construction and Demolition ...

fine harp deck screen will remove fine material from coarse aggregate [12, 13]. Further cleaning is necessary to ensure the recycled concrete product is free of dirt, clay, wood, plastic and ...

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Effect of recycled coarse aggregate on concrete ...

Jun 22, 2011 · Abstract. The effect of recycled coarse aggregate on concrete compressive strength was investigated based on the concrete skeleton theory. For this purpose, 30 mix proportions of concrete with target cube compressive strength ranging from 20 to 60 MPa were cast with normal coarse aggregate and recycled coarse aggregate from different strength parent concretes.

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Mechanical Behavior of Recycled Fine Aggregate Concrete ...

This study investigated the mechanical behavior of normal strength (NS) and high strength (HS) concrete containing recycled fine aggregates (RFAs). A high slump mixing design was employed, which may be potentially used as filled structural concrete. The compressive strength, tensile strength, and elastic modulus were measured according to the RFA replacement ratio and curing time.

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Influence of Recycled Aggregates on Mechanical Properties ...

involves crushing, removing and separation into various sizes and bulks. Reclaimed ... been found that fine recycled aggregates obtained from recycling concrete are more ... of substitution of natural aggregate by recycled concrete aggregate on the compressive strength of the material. Table 1 shows the mix proportion for the three mixes.

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Shear Strength of Reinforced Concrete Beams Made with ...

50% and 100% treated recycled aggregate. Test results showed that using treated recycled aggregate improved slightly the shear capacity of the beams in comparison with natural and untreated recycled aggregate. Theoretical predictions of the shear strength of the treated recycled aggregate beams were more conservative compared to the natural and

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PROPERTIES OF RECYCLED AGGREGATE CONCRETE

properties of recycled aggregate are much more pro-nounced than as is the case with natural aggregates. Figure 2. Appearance of the recycled aggregate grains [2] 2.1. Aggregate grading Grading of recycled coarse aggregate normally satisfies the standards for natural aggrega-te, while in the case of recycled fine aggregate,

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(DOC) AN INTRODUCTION TO RECYCLED AGGREGATE CONCRETE ...

Recycled aggregate posses relatively lower bulk density, crushing and impact values and higher water absorption as compared to natural aggregate. The compressive strength of recycled aggregate concrete is relatively lower up to 15% than natural aggregate concrete. 1.

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Mechanical Behavior of Recycled Fine Aggregate Concrete ...

This study investigated the mechanical behavior of normal strength (NS) and high strength (HS) concrete containing recycled fine aggregates (RFAs). A high slump mixing design was employed, which may be potentially used as filled structural concrete. The compressive strength, tensile strength, and elastic modulus were measured according to the RFA replacement ratio and curing time.

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STUDY ON WORKABILITY AND STRENGTH OF LOW-STRENGTH

The recycled fine aggregate was manufactured by only original crushing after demolishing old concrete bridge piers and buildings. The workability was measured by flow value and bleeding ratio. The target values were decided to be 250 to 300 and less than 3.0%

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Using fine recycled concrete aggregate for mortar production

Our study focused on the viability of replacing sand with fine recycled concrete aggregate in the production of mortar, i.e. composites made of cement, fine aggregates, water and eventually admixtures and additions, particularly for use as wall coatings and mixed on site for immediate application.

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Performance of Recycled Asphalt Pavement as Coarse ...

Compressive Strength. From the results of the development of compressive strength up to the age of 91 days presented in Figure 1 and 2 for all mixes, it is evident that in every case the strength continues to increase with age and that, for the given water/cement ratio and mix proportion, concretes made from the natural aggregate have a higher strength than those from RAP aggregate at all ages.

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Recycled Concrete Aggregates: A Review | International ...

Mar 29, 2013 · After demolition of old roads and buildings, the removed concrete is often considered worthless and disposed of as demolition waste. By collecting the used concrete and breaking it up, recycled concrete aggregate (RCA) is created (Fig. 1).This paper focuses on coarse RCA which is the coarse aggregate from the original concrete that is created after the mortar is separated from the rock

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Influence of Recycled Aggregates, Foundry Sand and Fly Ash ...

It is expected that present study involving the effect of combination of recycled aggregates, foundry sand as a partial replacement of fine aggregate and fly ash as a partial replacement of cement on compressive strength of concrete will be beneficial to the existing construction methodology.

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2 Types of Concrete Crushers | HXJQ

Aug 01, 2019 · Abandoned concrete blocks are high-quality concrete aggregates which have many advantages. For example, after the buildings are dismantled, the high-quality concrete blocks and silt after crushing and screening can be used as recycled coarse and fine aggregates for concrete. The fine powder can be directly used as the raw material of cement.

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Green Concrete from Sustainable Recycled Coarse Aggregates ...

Further, the mechanical properties like crushing and impact values of recycled aggregate are shown in Figure 3 along with natural aggregates. Figure 3 revealed that the crushing and impact values of unwashed recycled aggregates are higher than natural and washed recycled aggregates. The crushing and impact values of unwashed recycled aggregates were found to be 43–48% and

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Recycled aggregate concrete - SlideShare

Nov 15, 2017 · The results are tabulated under Table 4. Percentage of Recycled Aggregate (%) Slump (mm) 100% recycled aggregate 48 75% recycled aggregate 55 Table 4: Variation of Slump with Percentage of RAC. 11. IV) Compression Test A Concrete mix having cement, fine aggregate and coarse aggregate in the ratio of 1:2.65:3.92 was prepared.

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Effect Of Physical Properties Of Recycled Aggregate On The ...

Aggregates. Locally available natural sand with 4.75 mm maximum size was used as fine aggregate, having specific gravity, fineness modulus and unit weight as given in Table 3 and crushed stone with 16mm maximum size having specific gravity, fineness modulus and unit weight as given in Table 3 was used as coarse aggregate.

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