effect of modification of recycled concrete aggregates on

Effect of Surface Modifications of Recycled Concrete ...

The experiment aims to test the specific way of producing concrete with recycled concrete aggregate (RCA). To reduce its negative impact on the concrete properties, two different ways of treatment of the RCA with geopolymer slurry were applied—coating during the mixing using the specific mixing approach and coating prior to the mixing of concrete

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(PDF) Effects of using recycled concrete as aggregate on ...

Fig. 4 shows the effect of using recycled concrete aggregates The recycled aggregate concrete had approximately equal on tensile and flexural strengths of concrete at 28 days. The compressive strength to that of control concrete. The weight tensile and flexural strengths are lower for concretes with loss after 20 weeks in lactic acid was 29.6% ...

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EFFECT OF RECYCLED CONCRETE AGGREGATE QUALITY ON ...

Jul 14, 2020  effect of recycled concrete aggregate, air entraining admixture and maximum aggregate particle size on the behavior of concrete under freeze-thaw cycles. yeşim tarhan, remzi Şahin. delta winglets for enhancing solar energy: turbulent strain rate-heat convection relationship.

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Effects of environmental actions, recycled aggregate ...

Nov 01, 2020  To investigate the effect of the old mortar on the RC, modeled recycled aggregate (MRA) and modeled recycled concrete (MRC) had been developed to simplify the real RC for the experimental study , , . For instance, Xiao et al. [41] performed an experimental and analytical study to investigate the stress-strain behaviors of MRC under uniaxial ...

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

The effect of recycled concrete aggregate and steel slag on the dynamic properties of asphalt mixtures. By Alireza Azarhoosh. Physico-mechanical properties of asphalt concrete incorporated with encapsulated cigarette butts. By Abbas Mohajerani and Bao Thach Nguyen.

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Impact Properties of Recycled Aggregate Concrete with ...

Sep 02, 2020  Conclusion. (1) The combination of nanosilica solution concentration 2% and soaking time, 48 h, has better modification effect on the mechanical properties of recycled aggregates. Its apparent density increased by 1.6%, and crush index and

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Effects of environmental actions, recycled aggregate ...

To evaluate the effects of recycled aggregate (RA) quality on the RC durability, modeled recy-cled concrete (MRC) containing modeled recycled aggregate (MRA) with various thickness and coverage of old mortar, along with different degrees of initial damage, was fabricated and tested.

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"Using Recycled Concrete as Aggregate in Concrete ...

The main objective of this project was to evaluate the effects of using aggregate produced from crushed concrete pavement as a replacement for natural (virgin) coarse aggregate in pavement mixtures. A total of ten different concrete mixtures containing recycled concrete aggregate (RCA) were designed to meet the requirements of Indiana Department of Transportation (INDOT) specifications.

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The Effect of Recycled Concrete Aggregates and Metakaolin ...

Using recycled concrete from demolished buildings as an aggregate in new concrete preparation can have a significant role in the sustainable development of the concrete industry; therefore, in this research work, the effect of employing different percentages (i.e., 20, 40, 60, 80 and 100%) of recycled concrete aggregates and the impact of using ...

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Surface Treatment on Recycled Coarse Aggregates with ...

Surface treatment, using two slurries containing nanomaterials, was applied to recycled aggregate (RA). Experimental studies were conducted (1) to compare properties of RA before and after the surface treatment; and (2) to examine the modification effects of the surface treatment with nanomaterials on the microstructure and macroproperties of recycled aggregate concrete (RAC).

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Application of Conventionally Recycled Coarse Aggregate to ...

4. Tests for recycled concrete using coated recycled coarse aggregate 4.1 Types of concrete and mix proportions The types of concretes and mix proportions are listed in Table 5. Two types of ...

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Surface modified used rubber tyre aggregates: effect on ...

Jun 12, 2015  This study considers how to minimise the loss of strength of concrete with used rubber tyre crumb aggregates and investigates the improvement of water permeability resistance that may consequentially develop. A surface of rubber crumb was modified by soaking in the saturated sodium hydroxide solution or silane coupling agent (SCA) before using.

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Experimental Study on the Influence of Water Absorption of ...

Apr 04, 2015  In this paper, three recycled coarse aggregates (RCAs) with different 24-h water absorptions (5.67, 3.12, and 1.98 wt%) were used to produce recycled coarse aggregate concretes (RCACs). Different water absorption rates were obtained by modifying the surface of RCAs with low and high concentration of alkaline organosilicone modifier that is ...

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Properties of porous concrete from waste crushed concrete ...

Recycled aggregate porous concrete properties investigated. Higher total void ratio and water permeability exhibited by recycled aggregate. Polymer modification significantly improved strength properties of recycled aggregate porous concrete. Use of recycled aggregate along with optimum content of polymer produced acceptable porous concrete.

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Application of Conventionally Recycled Coarse Aggregate to ...

This paper aims to establish a technique for easy concrete recycling as a solution essential for the creation of a closedloop recycling society. The technique introduced in this study enables improvement of the recovery rate of original aggregate by enhancing the peeling-off effect of aggregate without any degradation of mechanical properties.

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Treatment Methods for the Quality Improvement of Recycled ...

Jan 24, 2021  Ryu J S. An Experimental Study on the Effect of Recycled Aggregate on Concrete Properties[J]. Mag. Concr. Res., 2002, 54(1): 7–12. CAS Article Google Scholar [19] Xiao J Z, Li W G, Sun Z H, et al. Properties of Interfacial Transition Zones in Recycled Aggregate Concrete Tested by Nanoindentation[J]. Cem. Concr.

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The Mechanical Properties of Recycled Coarse Aggregate ...

Using recycled coarse aggregate (RCA) to replace natural pebbles and using lithium slag (LS) from industrial waste to replace cement in order to improve the mechanical properties of concrete and solve environmental problems. In this study, the effects of different substitution rates of RCA (0, 30%, 50%, and 70%) and different LS contents (0, 10#x0025;, 15#x0025;, 20#x0025;, and 25#x0025 ...

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"Bond performance of recycled aggregate concrete" by ...

"In recent decades, engineers have sought a more sustainable method to dispose of concrete construction and demolition waste. One solution is to crush this waste concrete into a usable gradation for new concrete mixes. This not only reduces the amount of waste entering landfills but also alleviates the burden on existing sources of quality natural concrete aggregates.

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Experimental study on the compressive strength, damping ...

At present, many modification methods have been proposed to improve the performance of recycled aggregate concrete (RAC). In this study, tests on the compressive strength and damping properties of modified RAC with the addition of different proportions of recycled coarse aggregate (RCA) (0, 50, 100%), rubber powder (10, 15, 20%), steel fibre (5, 7.5, 10%) and fly ash (15, 20, 5%) are carried out.

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Effect of waste tyre rubber on mechanical and durability ...

Dec 01, 2018  Tensile strength of concrete containing chipped rubber (replacement for aggregates) is lower than that of concrete containing powdered rubber (for cement replacement). Replacement of rubber for aggregate or cement in concrete caused a reduction in its flexural strength for both grades, but the rate of reduction was different.

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"Using Recycled Concrete as Aggregate in Concrete ...

The main objective of this project was to evaluate the effects of using aggregate produced from crushed concrete pavement as a replacement for natural (virgin) coarse aggregate in pavement mixtures. A total of ten different concrete mixtures containing recycled concrete aggregate (RCA) were designed to meet the requirements of Indiana Department of Transportation (INDOT) specifications.

get price

The Effect of Recycled Concrete Aggregates and Metakaolin ...

Using recycled concrete from demolished buildings as an aggregate in new concrete preparation can have a significant role in the sustainable development of the concrete industry; therefore, in this research work, the effect of employing different percentages (i.e., 20, 40, 60, 80 and 100%) of recycled concrete aggregates and the impact of using ...

get price

Surface Treatment on Recycled Coarse Aggregates with ...

Surface treatment, using two slurries containing nanomaterials, was applied to recycled aggregate (RA). Experimental studies were conducted (1) to compare properties of RA before and after the surface treatment; and (2) to examine the modification effects of the surface treatment with nanomaterials on the microstructure and macroproperties of recycled aggregate concrete (RAC).

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"Bond performance of recycled aggregate concrete" by ...

"In recent decades, engineers have sought a more sustainable method to dispose of concrete construction and demolition waste. One solution is to crush this waste concrete into a usable gradation for new concrete mixes. This not only reduces the amount of waste entering landfills but also alleviates the burden on existing sources of quality natural concrete aggregates.

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Use of Recycled Crushed Concrete (RCC) Fines for Potential ...

detrimental effect to soil modification. Figure 5. shows a typical stockpile of RCC fines produced from crushing operations. The Department of Roads has limited the amount of fines to be used as base course, due to potential drainage problems. When the concrete to be crushed is severely deteriorated

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Effect of the surface treatment of recycled rubber on the ...

Jun 07, 2014  In this study, the influence of the addition of tire rubber in concrete was evaluated, to partially replace the fine aggregate of sand particles. The rubber fibers were also surface treated with different solvents to improve adhesion of the fibers to the concrete matrix. Compressive strength, slump test, Fourier Transform Infrared Spectroscopy of concrete samples were performed at time ...

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Application of Conventionally Recycled Coarse Aggregate to ...

This paper aims to establish a technique for easy concrete recycling as a solution essential for the creation of a closedloop recycling society. The technique introduced in this study enables improvement of the recovery rate of original aggregate by enhancing the peeling-off effect of aggregate without any degradation of mechanical properties.

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Modification of Waste Aggregate PET for Improving the ...

Dec 19, 2019  The typical density of normal weight concrete ranges between 2200 and 2400 kg/m 3, while lightweight concrete density is below 2200 kg/m 3 [].From the results shown in Figure 3, the density of concrete with plastic aggregates was below 2200 kg/m 3, thereby being classified as lightweight concrete.The potential application of plastic aggregates concrete (PAC) may noticeably reduce the

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Treatment Methods for the Quality Improvement of Recycled ...

Jan 24, 2021  Ryu J S. An Experimental Study on the Effect of Recycled Aggregate on Concrete Properties[J]. Mag. Concr. Res., 2002, 54(1): 7–12. CAS Article Google Scholar [19] Xiao J Z, Li W G, Sun Z H, et al. Properties of Interfacial Transition Zones in Recycled Aggregate Concrete Tested by Nanoindentation[J]. Cem. Concr.

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Guide to Cement-Modified Soil (CMS)

The restructuring of modified soil/aggregate particles, known as flocculation and agglomeration, changes the texture of the material from that of a plastic, fine-grained material to one more resembling a friable, granular soil/aggregate. Made Rigid Pavement Concrete Subbase Subgrade Asphalt Base Subbase Subgrade Flexible Pavement Figure 1.2.

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Velay Research Group

- Our paper "Effect of fine and coarse recycled concrete aggregate on the mechanical behavior of precast reinforced beams: comparison of FE simulations, theoretical, and experimental results on real scale beams" was published in Construction and Building Materials (impact factor:3.485).

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Effects of Crumb Rubber on Concrete Properties When Used ...

Apr 04, 2017  Different percentages of varying gradations of crumb rubber were used as an aggregate in concrete. The results of this study show that the addition of crumb rubber to concrete as a percent replacement of the fine aggregate is detrimental to the overall strength of the specimen, but not so much that it may not be used in small amounts.

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Strengthening and shape modification of fire-damaged ...

8. Baradaran-Nasiri, A. and Nematzadeh, M. The e ect of elevated temperatures on the mechanical properties of concrete with ne recycled refractory brick aggregate and aluminate cement", Construction and Building Materials, 147, pp. 865-875 (2017). 9.

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Effects of Recycled Aggregates on Water-Cement Ratio for ...

Recycled aggregate differs from primary aggregate in that it constitutes of two types of materials: the primary aggregate and the attaching cement mortar. This study was conducted in order to investigate the effects on water-cement ratio for concrete cast with recycled aggregates derived from different origins (hollow blocks structural concrete elements) and different mixed proportions of ...

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