The Effect of Recycled Aggregate Quality on Concrete

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EFFECT OF RECYCLED CONCRETE AGGREGATE QUALITY ON ...

Jul 14, 2020  The objective of this study is to investigate the effect of recycled concrete aggregate (RCA) quality on the properties of hardened concrete properties such

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The Effect of Recycled Aggregate Quality on Concrete ...

The Effect of Recycled Aggregate Quality on Concrete Properties. Abstract: Waste from construction and demolition are one of the main types of wastes produced

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(PDF) The Effect of Recycled Aggregate Quality on Concrete ...

Using unwashed recycled aggregate in concrete will affect its strength. The effect will be more obvious at lower water/cement ratios. When the recycled

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The effect of recycled concrete aggregate properties on ...

Oct 01, 2011  Due to the high percentage of coarse aggregate used in concrete, a sustainable and economical source of high quality aggregate is essential to the concrete

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Effect of recycled concrete aggregates on strength and ...

produced in a quality-controlled environment, and contains little or no deleterious materials. The repetitive construction environment for precast concrete would

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Effect of recycled concrete aggregates on strength and ...

produced in a quality-controlled environment, and contains little or no deleterious materials. The repetitive construction environment for precast concrete would also allow the effects of RCA to be closely monitored and controlled. Ultimately, Effect of recycled concrete aggregates on strength and stiffness gain of concrete and on bond strength

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Effect of Modification of Recycled Concrete Aggregates on ...

May 28, 2021  In the present paper, laboratory trials were conducted to investigate the possibility of 100 % recycled concrete aggregates as a replacement of coarse aggregates in pavement quality concrete (PQC) design mix (M40). Initially characterisation of recycled concrete aggregate is done to meet the requirements of its use as an aggregate in PQC.

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Enhancing the quality of recycled coarse aggregates by ...

Sep 15, 2021  The adherence of mortar on the surface of RCA affects the mechanical and durability properties of the recycled aggregate concrete (RAC) (Abdulla 2014, Dhir and Paine 2007, Xu and Shi 2000, Ho et al. 2013, Otsuki et al. 2003, Katz 2004, Revathi et al. 2014, Saravanakumar and Dhinakaran 2014, Juan De and Gutiérrez 2009).Puthussery et al. reported that replacement of RCA beyond 50%

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Effects of Recycled Aggregate Characteristics ... - Concrete

Apr 01, 2000  Title: Effects of Recycled Aggregate Characteristics on Performance Parameters of Recycled Aggregate Concrete Author(s): S. Nagataki, A. Gokce, and T. Saeki Publication: Symposium Paper Volume: 192 Issue: Appears on pages(s): 53-72 Keywords: compressive strength; mortar; porosity; recycling; water Date: 4/1/2000 Abstract: This study points out the close relationship between several quality ...

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Effect of Recycled Aggregates Concrete Construction Magazine

Nov 03, 2010  These differences become greater with increasing amounts of recycled fine aggregates. Too many recycled fines also can produce a harsh and unworkable mix. Many transportation departments have found that using 100% coarse recycled aggregate but only about 10% to 20% recycled fines works well. The remaining percentage of fines is natural sand.

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Effects of Recycled Aggregate on Concrete Mix and Exposure ...

Jun 25, 2019  The unit weight of the concrete ranged from 2365 to 2175 kg/m 3, depending on aggregate content (Figure 6).Increasing the recycled aggregate content reduces the unit weight and density of the concrete, resulting in lighter concrete (Figure 6).The unit weights of the 15%, 20%, and 25% mixes were reduced by 8%, 11%, and 11.5%, respectively, compared to plain concrete.

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Quality Improvement of Recycled Aggregate Concrete ...

To avoid the excessive exploration of nature resource the method of recycling of used concrete to become new one were needed. The used concrete was used for coarse aggregate. To improve the quality of concrete from the used one, additional material was required, that is, fly ash. The test material were formed of cube of 15x15x15 cm in size.

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Effect on recycled aggregate on concrete properties ...

Akbari, Arora Vakil [9] studied the effect on recycled aggregate on concrete properties. Three different water ratios 0.60, 0.52 and 0.43 and aggregate replacement of 0%, 15%, 30%, 50% were ...

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Quality Improvement Techniques for Recycled Concrete ...

The main problem in using recycled concrete aggregate (RCA) as a construction material is due to the weak adhered mortar which usually has higher porosity and water absorption. It also has lower strength compared to natural aggregate (NA), and it often forms weak interfacial transition zones in the recycled aggregate concrete (RAC). These weak ...

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Effect of Recycled Coarse Aggregate on Concrete Properties ...

The replacement of recycled aggregate on concrete will decrease the characteristic Strength. In the context of Batch 1, the characteristic Strength for 0% was 29.58 MPa, 35% Recycled Aggregate was 27.27 MPa, 50%. Recycled Aggregate was 25.27 MPa and 65% Recycled Aggregate was 23.08 MPa.

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The Environmental Impact of Recycled Concrete

4. Characteristics of recycled concrete aggregate The international literature provided numerous works at recycled concrete aggregate area, mainly from the beginning of 1980 (Hansen, 1992). The topics most investigated are durability and mechanical characteristics. The quality of aggregates made of recycled concrete affects directly the

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(PDF) FLY ASH AND RECYCLED COARSE AGGREGATE IN CONCRETE

Use of recycled coarse aggregate in concrete can be useful for environmental protection and economical terms. Recycled aggregates are the materials for the future.

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Indian Concrete Journal

The effect of the quality of construction and demolition waste on recycled aggregates concrete properties Miguel Bravo, Jorge de Brito, Luís Evangelist (Portugal) Most studies have paid attention to the analysis of concrete with recycled aggregates (RA) that come from one source only.

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CO2 sequestration by construction and demolition waste ...

Recycled aggregates (RA) can capture and storage CO 2.. CO 2 curing of RA produces a positive effect on their physical characteristics.. Carbonated RA (CRA) are less absorbent and mechanically more resistant than RA. • It is possible to use CRA in mortars and concrete as an alternative to natural aggregates.

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Effects of Recycled Aggregate Characteristics ... - Concrete

Apr 01, 2000  Title: Effects of Recycled Aggregate Characteristics on Performance Parameters of Recycled Aggregate Concrete Author(s): S. Nagataki, A. Gokce, and T. Saeki Publication: Symposium Paper Volume: 192 Issue: Appears on pages(s): 53-72 Keywords: compressive strength; mortar; porosity; recycling; water Date: 4/1/2000 Abstract: This study points out the close relationship between several quality ...

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Effect of Recycled Aggregate on Compressive Strength of ...

Nov 11, 2014  The results shows that replacement of 25-30 percent of recycled aggregate in place of fresh concrete does not have much effect on properties of concrete. Fresh properties were studied by slump test and compaction factor test. Mechanical properties studied are compressive strength and flexural strength and tensile strength.

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The Environmental Impact of Recycled Concrete

4. Characteristics of recycled concrete aggregate The international literature provided numerous works at recycled concrete aggregate area, mainly from the beginning of 1980 (Hansen, 1992). The topics most investigated are durability and mechanical characteristics. The quality of aggregates made of recycled concrete affects directly the

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Use of Recycled Concrete Aggregate in PCCP: Literature

Properties and Characteristics of Recycled Concrete Aggregate A concrete pavement’s strength and performance is very dependent on the aggregates used to produce the concrete. Recycled concrete aggregates are different in many ways from virgin aggregates as shown in Table 1. Table 1. Comparison of typical virgin aggregate and recycled concrete ...

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Strength and Durability Evaluation of Recycled Aggregate ...

May 14, 2015  This paper discusses the suitability of producing concrete with 100 % recycled aggregate to meet durability and strength requirements for different applications. Aggregate strength, gradation, absorption, specific gravity, shape and texture are some of the physical and mechanical characteristics that contribute to the strength and durability of concrete. In general, the quality of recycled ...

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Indian Concrete Journal

The effect of the quality of construction and demolition waste on recycled aggregates concrete properties Miguel Bravo, Jorge de Brito, Luís Evangelist (Portugal) Most studies have paid attention to the analysis of concrete with recycled aggregates (RA) that come from one source only.

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(PDF) FLY ASH AND RECYCLED COARSE AGGREGATE IN CONCRETE

Use of recycled coarse aggregate in concrete can be useful for environmental protection and economical terms. Recycled aggregates are the materials for the future.

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Effect of Flyash on Recycle Coarse Aggregate Concrete

quality of the recycled material used. In the process of manufacturing such recycled aggregate, the manufacturing cost and amount of CO 2 emissions is likely to rise sharply, consequently limiting the extent to which recycled aggregate concrete is used3.

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Admixtures From Recycled Aggregates Concrete Construction ...

Apr 01, 1997  Nor did the recycled aggregate from the air-entrained concrete have any significant effect on the air content of the new concrete. The air containing calcium chloride did raise the chloride content of the new concrete, but not enough to account for all the original chloride. Further details are given in the article cited.

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Evaluation on the Mechanical Performance of Low-Quality ...

Jan 20, 2016  Concrete is one of the most prominent materials used for construction in modern societies. Among its constituents, aggregates for concrete have a significant impact on quality of the density and water absorption ratios as they account for 70–80 % of the total volume (Choi et al. 2014a; Noguchi and Tamura 2001).Thus, in order to manufacture high-quality concrete, there is a need to

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Effect of Use of Recycled Coarse Aggregate in Concrete ...

A comparative analysis of the experimental results of the properties of Natural Aggregate Concrete and different replacement ratios of natural aggregates with recycled coarse aggregates is presented in the paper. Recycled aggregate was made by crushing the waste concrete of laboratory test cubes. Four type of concrete mixtures were tested: concrete made entirely with natural coarse aggregate ...

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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 of concrete.

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CO2 sequestration by construction and demolition waste ...

Recycled aggregates (RA) can capture and storage CO 2.. CO 2 curing of RA produces a positive effect on their physical characteristics.. Carbonated RA (CRA) are less absorbent and mechanically more resistant than RA. • It is possible to use CRA in mortars and concrete as an alternative to natural aggregates.

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Effect of Ground Waste Concrete Powder on Cement Properties

May 23, 2013  The paste/mortar attached to the recycled aggregate decreases the quality of the aggregate and needs to be stripped. The stripped paste/mortar is roughly 20% to 50% in waste concrete, but relevant research is very limited. In this paper, the effects of ground waste concrete (GWC) powder, coming from the attached paste/mortar, on water demand for normal consistency,

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