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The water–cement ratio (w/c) has a significant effect on the strength of recycled concrete. In this study, considering the effects of water/cement ratio, strength, and water content of recycled aggregates, two kinds of pulse sequences of low-field nuclear magnetic resonance (LF-NMR) were applied to investigate the water migration behavior between simulated …
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It is an inevitable trend to recycle and use construction waste. Recycled aggregate concrete (RAC) has been widely studied and put into use. However, it is an important issue to improve the utilization rate and sustainability of waste concrete that how to use RAC for generations and apply it in a durable environment (freezing and thawing, carbonation, chloride ion erosion, etc.).
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Recycling construction and demolition waste is profitable and environmental way to produce aggregates and reuse valuable materials that would otherwise be disposed. Processing the waste near the worksites also reduces the need for truck transportation resulting in …
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Use of recycled concrete aggregate in construction industry has brought a revolutionary change in enhancing sustainability, improving economy, implementing waste management rules, conserving non-renewable energy resources. The present work gives an insight into proportioning the recycled concrete aggregates from building demolition waste …
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The weight of recycled aggregate used for experimental program was 11.01 kg. Hence, the recovery rate of RA from concrete wastes was about 42.36%. Recovery rates of recycled aggregate vary from almost 100 percent in some parts of the world to nearly zero in countries where most construction waste ends up in the landfill like India [15]. With ...
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Recycled aggregates (RA) from construction and demolition waste (CDW) instead of natural aggregates (NA) were analysed in the manufacture of new eco-friendly concrete. Fine (FRA) and coarse (CRA) recycled aggregates were used in different percentages as substitutes of natural sand and gravel, respectively. The results revealed that the use of RA …
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This paper concerns the recovery of construction and demolition waste as coarse recycled aggregates for concrete. Coarse recycled aggregates may be used as a partial or total replacement of natural aggregates, contributing to the circular economy and minimizing landfill disposals as well as the consumption of natural mineral resources. However, …
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State-of-the-art recycling of construction and concrete demolition waste has up to now achieved an unsatisfying level only: Return rates of secondary raw material for concrete production are below 60%, and the application field is limited to low-grade concrete.; In particular, because of the low quality of available secondary aggregates, their exchange rate for primary …
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The construction sector, in addition to being very important for the economy of several countries, also has a significant impact on the environment as it causes a huge natural …
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This research intends to analyse the durability performance of concrete with recycled aggregates (RA) from construction and demolition waste (CDW) from various locations in Portugal. ... Physical–chemical and mineralogical characterization of fine aggregates from construction and demolition waste recycling plants. J Cleaner Prod, 52 (2013 ...
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Recycling of construction waste is one way to counter risk to construction wastes. So, the invention of proper technology to recycle these materials is of great importance. For instance, concrete waste can be crushed and used as …
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Strategies for aggregates include reducing aggregate use by using recycled waste materials, using more durable aggregates to maximize pavement life, reducing hauling …
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There are some researchers take study on the recycling and application of construction waste, but hasn't systematic study about compressive strength of recycled aggregate brick until now though ...
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The results revealed that the mechanical and physical properties of the recycled C&D waste aggregates satisfied the desired specifications for use as subbase aggregates in …
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The incorporation of recycled aggregates from construction and demolition waste into concrete represents a promising sustainability strategy within the construction sector. ... trailed by Denmark's initiatives (Eurostat, 2018) and challenges faced by Germany in construction waste recycling (Schiller et al., 2003). In 2003, England witnessed an ...
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Although the utilization of construction waste derived recycled aggregate (CWDRA) has been reported as a promising way to reduce carbon emission and energy consumption for construction industry, the resistance of reinforced concrete containing CWDRA to corrosion and freeze-thaw (F-T) cycles are usually inferior than that containing natural …
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Concrete is a composite material, basically consisting of different constituents such as binding materials, water, aggregates and admixtures. Among these ingredients, aggregate plays a very crucial role in concrete which occupy the largest volume of about 60–75% of total concrete volume [1].It is indispensable for any construction work.
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As the world's largest producer of construction waste, China's recycling and related policies are of the biggest concern to the world. However, the effective disposal and reuse of this waste has become an important issue since currently China still has a very low recycling ratio compared to developed countries, and most of the waste concrete was only simply …
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In the recent past, substantial explorations have been accomplished to appreciate the distinct attributes of concrete employing recycled aggregates (RA) from construction and demolition waste. The preparation of recycled aggregate is given in Fig. 1 b, the image showing coarse, medium, and fine RA is given in Fig. 2.
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2. Recycling is the act of processing the used material for use in creating new product. Usage of natural aggregate is becoming intense. Recycled aggregates can replace natural aggregate. Recycled aggregate are obtained from construction and demolition debris.
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At present, the use of recycled concrete aggregate compared to other recycled materials is widely implemented for recycled aggregates (RAs) in construction, and many countries …
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4. INTRODUCTION To achieve sustainable issue in construction area, researchers and companies focus on using waste concrete as a new construction material. It is called recycled aggregate which can be …
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For recycled concrete aggregate from concrete waste, the use of up to 90% of recycled aggregate is allowed if water absorption is at most equal to 10% and content of contaminants up to 0.2%; meanwhile, for recycled concrete aggregate from demolition …
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Some of these plants accept asphalt, brick and concrete, but may also accept other types of solid waste typically generated at construction and demolition (C&D) sites such as wood, gypsum wallboard, furniture and rugs. ... Search for the keywords such as Aggregate Recycling; Asphalt Reclaiming; Demolition Contractors; Recycling Centers ...
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Similar to other countries, the major components of C&D waste generated in Korea are concrete and asphalt. Hence, research and development (R&D) related to the recycling of C&D waste has been carried out in the direction of producing high-quality recycled aggregate from concrete and asphalt waste (Kim & Chung 2012).As a result of the R&D, the quality of …
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Recycled aggregates. Construction will often require demolition of existing buildings and structures built with hard and durable materials such as concrete and brick which can be recycled and re-used in new construction. Recycled aggregates are the product of processing inert construction and demolition waste, asphalt planings and used railway ...
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Construction & Demolition Waste 19 Recycled Concrete Aggregates 22 Wood Waste 27 Milled Waste 30 Other Wastes 32 - Incineration Bottom Ash 32 - Excavated/ Dredged Materials 34 ACCREDITATION SCHEME FOR 39 ... Recycled aggregate comprising principally of …
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One ton of construction waste can produce 0.85 tons of recycled aggregate, 0.01 tons of scrap steel, and the rest is other waste. The selling price of recycled aggregate is about 60% of the natural sand and gravel materials, which can …
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The construction sector, in addition to being very important for the economy of several countries, also has a significant impact on the environment as it causes a huge natural resources depletion and generates an enormous amount of waste. Therefore, the use of recycled aggregate from construction and demolition waste, instead of conventional …
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Accumulated construction and demolition waste (CDW) can occupy much land and cause environmental pollution. To dispose of CDW and slow down the depletion of natural resources, the use of recycled aggregates (RA) prepared from CDW as a substitute for natural aggregates (NA) in preparing concrete materials has become an essential trend in the …
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