Characteristics of waste concrete powders from multi …

Over the past decade or so, there has been growing interest in multi-recycling of concrete in order to achieve true sustainable development. The concept of repeated recycling of concrete is as follows: recycled coarse and fine aggregates obtained by crushing concrete waste, mainly natural aggregate concrete, are used to replace natural aggregates in the production of …

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Developing circular concrete: Acid treatment of waste concrete …

A zero CO 2 emission process that generates a silica-rich residue that is pozzolanic using waste concrete as the primary raw material could contribute significantly to the production of low-carbon concrete ... Chemical extraction and mechanical crushing method for fine aggregate recycling from waste concrete. J. Chem. Eng. Jpn., 43 (10) (2010 ...

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CO2-fixing and recovery of high-purity vaterite CaCO3 from …

Under the optimized conditions, the leaching rate of Ca 2+ is 65.7%, and solid residue is amorphous gel with minor phase of brownmillerite. Vaterite (∼1-10 µm) with purity of 97.8% can be successfully produced. ... (RCF) as a by-product of waste concrete recycling into high purity vaterite CaCO 3 microparticles was demonstrated by using a ...

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Pervious concrete with secondarily recycled low-quality brick-concrete

Brick-concrete demolition residue after the primary recycling is generally discarded due to its low quality. Secondary recycling of the brick-concrete demolition residue is urgently required to be solved at present in China due to the large scale constructions and demolitions, and remains a challenging task.

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How to Recycle Concrete?

Recycling concrete diverts this waste, extending the life of landfills and reducing the need for new ones. Lower Carbon Emissions: The production of new cement, a key component of concrete, is an energy-intensive process responsible for a significant portion of …

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The Benefits of Recycling and Reusing Fly Ash

Fly ash, also known as flue ash, is a green material that originates from one of the earth's largest sources of air pollution—coal. More than 50 percent of electricity in the U.S. comes from coal-fired power plants. 2 Because these plants are so widely used, fly ash is one of the most abundant industrial by-products on Earth. Fly ash is produced by coal-fired power plants.

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CONSTRUCTION, DEMOLITION, AND RENOVATION

s pay an average of $500 per home for waste removal. C&D debris is one type of solid waste. It is a large and varied waste stream that includes concrete, asphalt, wood, gypsum, and asphalt shingles generated from the construction, renovation, and demolition of buildings, roads, bridges, and dams. Total C&D waste

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Recycling of waste glass as aggregate in cement-based materials

A huge problem with glass is the single-use purpose for applications such as beverage bottles, which is one of the main uses of glass. Waste glass is estimated to account for 5% of the global municipal solid waste generated in 2016 [1], with recycling rates varying globally and within regions.In 2017, Europe had a glass recycling rate of 71.48%, with individual …

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Total recycling of concrete waste using accelerated …

Intensive research into the carbonation of waste concrete has been carried out over the last decade. As a result, promising results regarding the strengthening of RCAs/RCFs and the re-activation of RCPs were reported [15, 19, 20].Such a technique is theoretically based on the strong capacity of residual hydrated cement paste to bind CO 2 and form new carbonation …

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(PDF) A review on concrete recycling

Recycled concrete, when appropriately processed and mixed, can exhibit similar structural properties to conventional concrete, making it a viable option for retrofitting projects.

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Characterization and recycling of the fine fraction of …

In this way, a consistent use of aggregates arising from demolition of existing concrete structures (also called "recycled concrete aggregates") [107][108][109], crushed asphalt [110], waste sand ...

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Value-added recycling of waste concrete fines into …

Rapid urbanization made concrete the most widely used construction material worldwide. As the major fine aggregate of commercial ready-mix concrete, the natural river sand resource is therefore depleting [1], [2].On the other hand, the fine fraction of the recycled concrete aggregate derived from construction and demolition (C&D) waste lacks practical and …

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Recycling, reusing and environmental safety of industrial by …

By 2020, China's annual solid waste produced by agricultural waste and industrial waste accounted for a relatively high proportion, about 47 % and 30 % [2]. Currently, general industrial waste produced from mining and industrial companies' production processes is the primary focus of solid waste recycling and reusing resource [3].

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Characterization and recycling of the fine fraction of …

Abstract Shredder is the equipment used for ferrous scrap grinding that enables the recycling of steel in steel mills. The scrap is mostly originated from end-of-life vehicles (ELV).Therefore, this residue is known as automotive shredder residue (ASR). Throughout the world, is estimated that more than 25 million vehicles turn into an ELV every year, and most of …

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(PDF) Recycling of concrete construction and demolition waste …

The concrete demolition and construction waste (CDW) is usually recycled as aggregate. The fine fraction (crushed sand and powder) obtained from the recycling process remains less recovered ...

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Assessment of the Applicability of Waste Concrete Fine …

The cement industry is responsible for a significant portion of global CO2 emissions, primarily due to the decarbonatization of limestone during clinker production. To mitigate this …

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Environmental impacts of three waste concrete recycling …

In addition, due to the recycling of waste concrete, the workload of waste concrete elimination (transportation and landfill) can be reduced. The more waste reused, the lower the environmental burdens of its transportation and disposal. The waste contents of the RAC, RLC, and RLAC products are 23.8%, 30.0%, and 46.3%, respectively (Table 2 ...

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Characterisation and management of concrete grinding …

Concrete grinding residue is the waste product resulting from the grinding, cutting, and resurfacing of concrete pavement. Potential beneficial applications for concrete grinding residue include use as a soil amendment and as a construction material, including as an additive to Portland cement concrete.

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Municipal solid waste incinerator residue recycling by thermal

The following points should be considered if MSW incinerator residue melting facilities are to share a major role in municipal waste management and recycling in general. Firstly, the appropriate technology should be established so that slag should be considered as a recyclable resource.

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Recycling of landfill wastes (tyres, plastics and glass) in

At present, crumb rubbers (from tyres) and glass sands (from crushed waste glass) are being used in concrete and road constructions while plastics are often used in manufacturing civil structures.

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Recycling of Mine Wastes in the Concrete Industry: A …

The mining industry generates a substantial amount of waste materials, including tailings and waste rocks, which, if not managed correctly, pose threats to the environment and public health due to their long-term accumulation and disposal. Simultaneously, the construction sector consumes important amounts of natural resources like water and rocks. However, …

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Construction Wastes: Types, Causes, and Recycling …

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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Electrochemical recycling of recycled concrete powder: …

The escalating pace of urban development and infrastructure replacement has resulted in a staggering annual generation of over 3.0 billion metric tons of construction and demolition waste globally (Akhtar and Sarmah, 2018, Pristerà et al., 2024), with waste concrete accounting for 40%–85% of the total (Letcher and Vallero, 2011).China's waste concrete …

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Recycling of spent coffee grounds in construction materials: A …

The previous research shows that the concrete industry holds immense potential for significantly enhancing the utilisation of various industrial by-products and waste materials, like fly-ash ...

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Environmental Considerations in Concrete Recycling

Breaking, removing and crushing hardened concrete from an acceptable source. Old concrete pavements often are excellent sources of material for producing recycled concrete aggregate …

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Recycling of ceramic tile waste into construction materials

Medeiros et al. partially replaced cement and sand with polishing tile waste and scheelite residue, respectively, to produce eco-efficient concrete and investigated the physico-mechanical properties and durability of the concrete (entry 9 of Table 5).

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(PDF) Recycling waste materials in geopolymer concrete

Geopolymer concrete prod uced from ground concrete waste (GCW) and fly ash offers excellent potential for recy cling large amount s of concrete waste f or a v ariety of applications. Ahmari et al ...

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Upcycling of construction and demolition waste: Recovery …

Recycled Concrete Aggregates (RCA) obtained from C&D facilities contain cement paste adhered to their surface, with studies indicating that approximately 20–30% of mortar …

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