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Combined Economic and Mechanical Performance Optimization of Recycled Aggregate Concrete with High Volume of Fly Ash ... 100% recycled coarse aggregates and wash-mix sand. ... Recycled aggregate ...

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Optimization of normal and high strength recycled aggregate concrete mixtures by using packing model. ... The recycled concrete aggregates ... only the mixture with 60% of recycled concrete aggregate presented permeability larger than the other concrete …

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International Journal of Engineering Trends and Technology (IJETT) – Volume 13 Number 3 – Jul 2014 ... extra cement should be preferred to produce a rich mix by using RCAs. 5. Recycled aggregate materials produce harsh mixes with ... PROPERTIES OF RECYCLED AGGREGATE IN CONCRETE AND Journal (Series of Natural Studies and Engineering) Vol.15 ...

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It is promising to use recycled powder in reactive powder concrete (RPC) to develop a green high-performance mixture with reduced cost. Based on previous study, different mixtures were designed and a comprehensive experimental program was developed to investigate the optimization of green reactive powder concrete (GRPC) mixture proportions ...

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Recycled Aggregates. Concrete mixture design is a multi-objective optimization problem that often involves the weighing of trade-offs between fresh-state properties, such as workability, flowability, and set time with hardened-state properties, such as strength, freeze thaw durability, and chloride durability.

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published by Siddique a review paper (2008) on the use of recycled plastic in concrete (Siddique, Khatib & Kaur 2008). In the other study, Choi et al. (2005) investigated the effect of plastic waste (PET bottles) as aggregate on properties of concrete. The results obtained in this study showed that these wastes could reduce the weight by 2–

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The aim of the research is to develop structurally sound Recycled Aggregate Concrete (RAC) with a good sound absorbing characteristics, and to use it in the manufacture of sound barriers for urban ...

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This research aims to optimize the mixing proportion of recycled aggregate concrete (RAC) using neural networks (NNs) based on genetic algorithms (GAs) for increasing the use of recycled aggregate (RA). NN and GA were used to predict the compressive strength of the concrete at 28 days. And sensitivity analysis of the NN based on GA was used to find the mixing …

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The developed concrete is intended to be used in mortarless masonry wall structures. Ten concrete mixtures with different types and replacement rates of recycled masonry aggregate and recycled expanded polystyrene were prepared, and their mechanical and …

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 · RILEM : Type 1 aggregates from masonry rubble, Type 2 aggregates from concrete rubble; Type 3 mixture of natural (min 80 %) and recycled (max 20 %) aggregate. 2.2 Shape and Gradation The shape of the aggregate pieces is influential on the workability of the concrete.

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Optimization on proportion for recycled aggregate in concrete using two-stage mixing approach. ... In order to improve the quality of recycled aggregate concrete, a mixing method: ... accumulation, and optimization. The crystallization of concrete is, however, a complex physical–chemical process affected by many ingredients that are hard to ...

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Optimization of Re-Mixing Recyclated Concrete Aggregates ... One of the basic commodity that have a significant impact on the environment is construction waste and his recycling options. Concrete aggregate (RCA), which can be made from concrete elements, has a great potential in reducing the volume of landfills and full re-using of concrete ...

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The developed concrete is intended to be used in mortarless masonry wall structures. Ten concrete mixtures with different types and replacement rates of recycled masonry aggregate and recycled expanded polystyrene were prepared, and their mechanical and thermal properties were experimentally investigated.

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Using Recycled Concrete Aggregates in New Zealand Ready-Mix Concrete Production Journal of Materials in Civil Engineering April 2010 Compression and Deformation Performance of Concrete Containing Postconsumer Plastics

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Recycled aggregate concrete (RAC) differ from natural aggregate concrete in mechanical and durability properties. The poorer qualities of recycled aggregate (RA) limit utilization of RAC in engineering. Cement mortar attached on the surface of recycled aggregate result in higher water absorption rate. Also, interfacial zone between recycled aggregate and new mortar consist of …

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Recycled aggregate concrete (RAC) differ from natural aggregate concrete in mechanical and durability properties. The poorer qualities of recycled aggregate (RA) limit utilization of RAC in engineering. Cement mortar attached on the surface of recycled aggregate result in higher water absorption rate. Also, interfacial zone between recycled aggregate and new mortar consist of loose …

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properties of recycled fine aggregate and recycled coarse aggregate & also compares these properties with natural aggregates. Basic changes in all aggregate properties are determined and their effects on concreting work are discussed at length. Similarly the properties of recycled aggregate concrete are also determined. Basic

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is research aims to optimize the mixing proportion of recycled aggregate concrete (RAC) using neural networks (NNs) based on genetic algorithms (GAs) for increasing the use of recycled a ggregate (RA). NN and GA were used to predict the compressive strength of the concrete at days.

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In general, the reuse and recycle of construction waste is concentrated in the preparation of recycled aggregate for concrete. By adding a portion of recycled aggregate instead of natural aggregate coarse into the mixture, producing the recycled concrete, which can conserve energy and materials for concrete production.

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 · 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.

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The objective of this competition is to design a concrete mix using an alternative material with low environmental impacts while preserving good mechanical properties AND good durability. Functional Unit The functional unit is the production of one cubic meter of concrete mixture complying with rules mentioned in sections 2.2 and 2.3.

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Currently, reuse of solid waste from disused infrastructures is an important environmental issue to study. In this research, polymer concrete was developed by mixing orthophthalic unsaturated polyester resin, artificial microfillers (calcium carbonate), and waste aggregates (basalt and limestone) coming from the recycling process of concrete sleepers.

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In this paper, some characteristics of recycled coarse aggregates obtained by crushing waste ready-mix concrete, as well as the mechanical and durability properties of recycled concretes made by using 25, 50, and 75% of these aggregates, are presented.

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Optimization on proportion for recycled aggregate in concrete using two-stage mixing approach. Recycled aggregate (RA) is well acknowledged having a poorer quality due to its higher porosity resulted from cement mortar remains attaching to its surface that hampers the recycling rate of concrete …

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As abundant CO2 is released by high-strength concrete due to its high binder content, the reduction of CO2 emissions has become increasingly important. This study proposed a general procedure to optimize the mixture design of low-CO2 high-strength concrete containing silica fume. First, the equations for evaluating strength and slump were regressed based on …

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The effect of presoaking of recycled coarse aggregate (RCA) in nano silica (NS) solution on the properties of recycled aggregates concrete is compared with the direct mixing of NS in concrete. In this study, four series of concrete are considered.

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 · Aggregates are the major constituent (ingredient) in concrete, making up 60% to 70% of the volume of concrete. Aggregates influence the workability of plastic concrete and also the durability, strength, thermal properties, and density of hardened concrete. Particle size divides aggregates into two categories: fine and coarse. Most fine aggregates are sand and contain particles smaller than 3/8 ...

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Optimization on proportion for recycled aggregate in concrete using two-stage mixing approach. Recycled aggregate (RA) is well acknowledged having a poorer quality due to its higher porosity resulted from cement mortar remains attaching to its surface that hampers the recycling rate of concrete waste.

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 · The present research studies the strength of concrete made with different replacement levels of natural aggregates with recycled aggregates. The replacement ratios considered are 0%, 30%, 35%, 40%, 45%, and 50% along with 10% replacement of cement with silica fume for different water–cement ratio to find the optimized mix.

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