2018年1月8日 Additionally, ‘best practice’ aggregate production, modelled here as the lowest water use for processing aggregate, can result in a 30% reduction in water consumption
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2023年9月8日 This paper proposes a novel and efficient washing process for aggregate processing plants using spiral nozzle, which decreases water usage by 50%. The feasibility
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3 天之前 However, the production of these aggregates also presents challenges in terms of processing and optimization. This article’s case study reveals that ALWAs, ... The
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2022年3月13日 It was found that industrial wastes like fly ash, municipal solid waste, palm oil shell, and water treatment sludge are some of the potential materials to produce lightweight
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2024年2月11日 This chapter introduces the reader to the world of aggregates. Data on the worldwide consumption of aggregates are discussed as well as their main types and sources,
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2021年12月17日 The presented approach to the production of aggregates of various shapes allows aggregates of high quality to be obtained, characterized by the appropriate characteristics: strength, water absorption, frost resistance,
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2020年9月22日 For example, a transition from river aggregate to crushed aggregate in a move towards the sustainable management of mineral resources will increase water consumption
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2024年2月27日 A detailed process to extract valuable and reusable recycled aggregate from waste concrete is presented in this chapter. Additional crushing stages and treatment
More2023年9月8日 This paper proposes a novel and efficient washing process for aggregate processing plants using spiral nozzle, which decreases water usage by 50%. The feasibility
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This study evaluated the environmental impact of landfill, incineration, and lightweight aggregate production for sewage sludge management techniques and compared the utilization of sewage-produced lightweight aggregates with natural aggregates in terms of building material production. Two scenarios were established for the life cycle assessment (LCA) of the sludge and
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Crushed aggregate is produced by crushing quarry rock, boulders, cobbles, or large-size gravel. Recycled concrete is a viable source of aggregate and has been satisfactorily used in granular sub-bases, soil-cement, and in new
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2024年2月27日 Natural coarse aggregate production process (Authors’) Full size image. 4 Closure. Waste generated from the demolition of existing structure is the major source of C D waste. Simply dumping this waste in landfill will create serious impact on social, economic, and environment life cycle.
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2021年6月14日 The sintering mechanism and optimal production process were revealed from evaluation of the performance of ceramsites ... During the granulation process, water was sprayed to keep the moisture content at about 25% and the ... Recent advances in artificial aggregate production. J. Cleaner Prod., 291 (2021), Article 125215. View PDF ...
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2022年3月13日 Among the reviewed industrial wastes, OPS does not require much treatment and energy-intensive process. Whereas the production of aggregates from fly ash facilitates large disposal of the generated fly ash. It was also found that for the quick production of aggregate from fly ash, MSW, and water treatment sludge, the sintering technique is used.
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2024年7月23日 The production process for artificial aggregate consists of five stages. In the first stage, the raw materials are dried. Drying is very important so that the resulting material is homogeneous and ...
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Crushing – once excavated, the rocks are much larger than the final aggregate needed for construction projects. Aggregate crushing is the process of breaking down the large pieces into smaller particles. Screening – different sized aggregates are required for different types of construction projects and materials – thus they need separating.
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2014年9月16日 Some key environmental impacts that are not quantified effectively in current LCIA impact categories are resource use and land-use change, as well as local impacts such as on biodiversity [28,30].
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To overcome water absorption and swelling by clay mineral layers, it is very important to develop stabilizing additives for water-based drilling fluids, where organic polymers are used as raw
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2024年1月29日 Green and low-carbon materialization for dredged sediment (DS) is limited due to its low pozzolanic activity. In this study, a novel DS-based non-sintered lightweight aggregate (LWA) is developed by steel slag (SS) and fly ash (FA) activation. Process optimization is performed by the response surfaces, and the basic properties and characterization of the
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2024年9月3日 This research addresses a critical gap in understanding the environmental impact of natural rock aggregate production in Sri Lanka. The study employs life cycle assessment (LCA) and SimaPro Software to simulate natural coarse aggregates’ extraction and manufacture process. Key findings reveal significant environmental impacts, with human carcinogenic
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2023年1月10日 Cold-bonding granulation was performed for aggregates production from MSWI fly-ash. • Water washing was investigated as fly-ash pre-treatment for soluble salts removal. • Multiple wastes were involved in the aggregate mixtures for higher waste reuse rate. • Double-layer aggregates were produced through a double-step pelletization ...
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2024年7月15日 The cement used in the ICEB production was procured from Bestway Cement, which was compliant with ASTM C 150 , and obtained through a local materials vendor. 2.2.3. Water. As for water, ordinary potable water compliant with ASTM C 94 was used in the production process. 2.3. Mix Design and Specimen Preparation
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2017年11月15日 Similar to normal aggregate concrete as the water cement ratio decreases the resistivity increases in the case of LWAC also [90]. 7.4. ... Sintered flyash aggregate production process and different production parameters that has significant influence on the aggregate properties has been thoroughly discussed.
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2023年1月1日 In the long-term use process, buildings are affected by many factors, such as weight, external load, rain, temperature change, etc., which cause many cracks and pores in the CDW. In addition, the crushing in the recycled aggregate production process further develops cracks in the pores of the recycled aggregates.
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2022年5月10日 Lithium slag (LS) is a kind of industrial waste, which is discharged in the production process of lithium carbonate and other lithium salts (Tan et al., 2021).As reported (Guo et al., 2020; He et al., 2017), 8–10 tons LS was discharged when 1 tons lithium carbonate was produced through sulfuric acid method.According to the statistical analysis, more than 80
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2009年10月1日 The reactivity of the wastes with carbon dioxide was measured in a pressurized reaction vessel. The oven-dried wastes were moistened with 10% water, and carbonated in a 100% carbon dioxide atmosphere held at 2 bar for 24 h. This process was repeated until the wastes were fully carbonated.
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2015年12月22日 19. Master Production Scheduling Master Production Schedule (MPS) - A detailed disaggregation of the aggregate production plan, listing the exact end items to be produced by a specific period. • More detailed than APP easier to plan under stable demand. • Planning horizon is shorter than APP, but longer than the lead time to produce the item.
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The preparation process of CAAs included the following steps: (1) Granulation: The disc method stood out as the most commonly employed granulation technique. Initially, raw materials were thoroughly mixed in accordance with the proportions. Subsequently, water was sprayed into the rotating disc until spherical aggregates formed.
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Fine-aggregate grading limit 37.5mm 25mm 12.5mm 4.75mm 2.36mm Sieve size 1.5in 1in. ½ in No.4 No. 8 Percent passing by mass 100 95 to100 80 to95 50 to 85 25 to28 From my visit to two quarry sites I can say, commonly the aggregate selection around Addis Ababa is based on three classes; two groups of fine aggregates (called 00 and 01) and one coarse aggregate (called 02).
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