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 …
اقرأ أكثر
Utilization of Concrete Slurry Waste for Soil Stabilization
This study aimed to develop carbon utilization sequestration technology that uses the concrete slurry water generated during the production of concrete as a new CO2 sink to reduce CO2 emissions ...
اقرأ أكثر
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.
اقرأ أكثر
Utilization of recycled concrete residues as secondary …
Nonetheless, the daily official recycling capacity is as low as 6,500 tones, or just 1%. ... Ball mill process is used to get the finer material of recycled concrete residue. The Recycled Cement and Recycled aggregates were used in different proportions to get an optimum mix. ... Extraction of useful raw materials from waste concrete2.1.
اقرأ أكثر
Comprehensive utilization of waste residue from lithium …
The waste residue cannot be used, resulting in both waste of resources and pollution, which is not up to the sustainable environment requirements (Hu et al., 2011). P.R.China is currently one of the biggest lithium producing countries in the world that mainly uses ore to extract lithium. Lithium extraction by the sulfuric acid method has caused ...
اقرأ أكثر
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.
اقرأ أكثر
Chemical recycling and use of various types of concrete …
Various concrete waste types include demolished concrete, concrete sludge, concrete grinding residue (CGR), and waste concrete fine. Appropriate methods to recycle …
اقرأ أكثر
A comprehensive review of properties of concrete …
The initial and final setting times of 25 MPa designed concrete were 580 and 690 min, respectively, while the 25% FA concrete in the same concrete design, the initial and final setting times were 280 and 420 min. The 40 MPa designed concrete by 25% LRR produced the same setting times and 78 and 64% higher than the control specimens.
اقرأ أكثر
Recycling concrete
Recycled concrete fines and recycled concrete paste . New uses for concrete demolition waste are in development. Recycled concrete fines are the residue of concrete waste after recycled aggregates are removed. It consists of cements pastes and sand. It accounts for ~15% of recycled concrete and currently has only low value uses.
اقرأ أكثر
Conversion of waste into sustainable construction materials: …
Materials like waste concrete, bricks, and glass can be repurposed as raw materials, offering a sustainable construction approach [37]. C&D waste is divided into two main categories: human-made resources and natural-made resources. ... Therefore, developing C&D waste recycling strategies to reduce the negative impacts of waste is an important ...
اقرأ أكثر
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].
اقرأ أكثر
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, …
اقرأ أكثر
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 ...
اقرأ أكثر
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 ...
اقرأ أكثر
Recycling of fresh concrete slurry waste as supplementary …
Concrete slurry waste (CSW) is one of the possible types of waste generated in ready-mix and precast concrete plants. CSW is a product of the aggregate reclaiming system where unused concrete and truck washing water are treated in order to reclaim and recycle the aggregates – CSW is the residue of this separation [1].
اقرأ أكثر
Recycling waste materials in construction: Mechanical …
By recycling of waste, it helps save limited landfill space saves waste disposal costs, reduces the demand for natural resources and minimizes concrete waste (Wang et al., 2024, Liu et al., …
اقرأ أكثر
Synergistic utilization, critical mechanisms, and …
Bauxite residue is a by-product of alumina extraction. Its red appearance is attributed to the presence of ferric oxide (Vachon et al., 1994) and it is known as red mud (RM) or Bayer red mud (Pontikes and Angelopoulos, 2013).The origin of the RM results in high alkalinity, excessive heavy metal content, small amounts of rare earth elements (REE) (Deng et al., …
اقرأ أكثر
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 …
اقرأ أكثر
Recycling of Waste Materials for Asphalt Concrete and …
5. Significance of Recycling Waste Materials in Asphalt Concrete and Bitumen 5.1. Application. Recycling waste materials in asphalt concrete can largely contribute to the sector of waste management. Roads and highways are the world's largest asset. In the United States, the length of the road network is approximately 6.58 million kilometers .
اقرأ أكثر
Recycling Concrete : Importance And Process
Recycling concrete refers to the process of converting waste concrete into reusable material. This practice involves breaking down concrete into smaller pieces, removing any contaminants, and then using the resulting material as a …
اقرأ أكثر
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.
اقرأ أكثر
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.
اقرأ أكثر
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 ...
اقرأ أكثر
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 ...
اقرأ أكثر
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 …
اقرأ أكثر
Potential of recycled concrete aggregate pretreated with waste …
Recycled concrete aggregate (RCA) is a representative of recycled aggregates obtained from C&D waste (Mills-Beale and You, 2010; Afonso et al., 2016).In general, the physical and mechanical properties of RCA are worse than those of natural aggregates due to the porous and weak mortar attached to RCA (Lee et al., 2012; Aljassar et al., 2005), e.g. lower resistance …
اقرأ أكثر
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 …
اقرأ أكثر
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 ...
اقرأ أكثر
Can Concrete Be Recycled?
Concrete can be recycled - it is done already in the industry. Old concrete can be reused as aggregates for new concrete production and save natural resources. Sika offers solutions to improve concrete recycling, thereby helping to reduce …
اقرأ أكثر
(PDF) Recycling of Non-metallic Residue from Waste …
The process of copper recovery from waste printed circuit board has generated large amounts of non-metallic fraction (NMF) residue. In this research, the residue was recycled as a substitute for ...
اقرأ أكثر