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recovery of high quality aggregate from concrete waste

recovery of high quality aggregate from concrete waste

Recovery of high quality aggregate from concrete waste ...

2018-12-10  technology of waste concrete scraps is paramount importance in Japan. So, this research uses the “Pulse Power Technology [1]” for recycling aggregate. We proposed the application of pulsed power to recovery of the high quality recycled aggregate from concrete waste[2]. The pulse power technology can generate the huge energy at moment, and

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Recovery of high quality aggregate from concrete waste ...

Request PDF Recovery of high quality aggregate from concrete waste using the pulsed power technology In Japan, the most of waste concrete scraps have been eused as roadbed materials and the ...

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(PDF) Advanced Process for Recovery of High Quality ...

From the waste concrete which is a hydrated compound with coarse aggregate, fine aggregate, and cement material, high quality recycled coarse aggregate for concrete making was produced by ...

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Assessment of amicrowave-assisted recycling process for ...

2021-7-15  resulted in lower fracture energy, higher fragmentation of samples and higher liberation of aggregates (i.e. free of cement paste). A microwave-assisted comminution process is therefore an effective recyding technique for the recovery of high-quality aggregates from concrete waste.

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(PDF) Recovery of Aggregates from Waste Concrete by ...

For producing high-quality recycled aggregates from waste concrete, the characteristics of waste concrete when subjected to breakage by impact were investigated under free-fall conditions at ...

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Ji-Whan Ahn , Kwang-Suk You , Gi-Chun Han , Nam-Il

Advanced Process for Recovery of High Quality Recycled Aggregate from Waste Concrete Ji-Whan Ahn a , Kwang-Suk You a , Gi-Chun Han a , Nam-Il Um a Hee-Chan Cho b

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Assessment of a microwave-assisted recycling process for ...

2014-1-10  Lab-made concrete specimens were cast as cylinders 40 mm in diameter and 80 mm in height for this investigation.They were manufactured using CEM 1 52.5 N Portland cement, cement to concrete ratio of 400 kg/m 3 (wet basis) and a water-to-cement ratio of 0.6 (mass basis). Aggregates used were either silico-calcareous (SC) or siliceous (S).

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(PDF) Assessment of a microwave-assisted recycling

Assessment of a microwave-assisted recycling process for the recovery of high-quality aggregates from concrete waste January 2014 International Journal of Mineral Processing 126:90–98

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Assessment of a microwave-assisted recycling process for ...

A microwave pretreatment was studied for producing high-quality aggregates. • Weakening of concrete samples was observed even at low energy microwave heating. • Decrease of the fracture energy and increase of the aggregate liberation. • Assessment of the robustness of the process for treating concrete waste.

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Concrete aggregates properties crushed by jaw and impact ...

2019-1-1  Assessment of a microwave-assisted recycling process for the recovery of high-quality aggregates from concrete waste Int J Miner Process , 126 ( 2014 ) , pp. 90 - 98 , 10.1016/j.minpro.2013.11.009 Article Download PDF View Record in Scopus Google Scholar

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High-quality coarse aggregate recycling from waste ...

2020-1-29  This study presents a liberation process for recycling high-quality coarse aggregates from waste concrete by impacting with steel grits. Considering the mortar liberation ratio and specific energy for the liberation process as well as the water absorption and apparent density of the recycled coarse aggregates (RCA), the effects of impact velocity, impact time, and concrete strength on the ...

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Concrete Waste Recycling Process for High Quality

2008-1-15  @article{osti_21144165, title = {Concrete Waste Recycling Process for High Quality Aggregate}, author = {Ishikura, Takeshi and Fujii, Shin-ichi}, abstractNote = {Large amount of concrete waste generates during nuclear power plant (NPP) dismantling. Non-contaminated concrete waste is assumed to be disposed in a landfill site, but that will not be the solution especially in the future,

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Assessment of a microwave-assisted recycling process for ...

Kathy Bru, Solène Touzé, Florent Bourgeois, Nicholas Lippiatt, Yannick Ménard. Assessment of a microwave-assisted recycling process for the recovery of high-quality aggregates from concrete waste. International Journal of Mineral Processing, Elsevier, 2014, vol. 126, pp. 90-98. 10.1016/j.minpro.2013.11.009 . hal-00920886

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Concrete aggregates properties crushed by jaw and impact ...

2019-1-1  Assessment of a microwave-assisted recycling process for the recovery of high-quality aggregates from concrete waste Int J Miner Process , 126 ( 2014 ) , pp. 90 - 98 , 10.1016/j.minpro.2013.11.009 Article Download PDF View Record in Scopus Google Scholar

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A process for separating aggregate from concrete waste ...

From the viewpoint of recycling of this waste concrete the recovery of aggregate contained in concrete at 80% and reuse of it into a new plant construction are envisioned. For these purposes we have studied the recovery process of aggregate from concrete composed of a heating step followed by a milling step onto waste concrete blocks.

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Development of High quality Recycled Aggregate

In this study, high quality recycled aggregate processing circuit was developed to recycle waste concrete. From the waste concrete which is a hydrated compound with coarse aggregate, fine aggregate, and cement material, high quality recycled coarse aggregate for concrete making was produced by autogenous milling and heat pretreatment method.

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Innovative Strategies for High-Grade Material Recovery ...

2011-1-17  Executive Summary: The “Innovative Strategies for High Grade Material Recovery from Construction and Demolition Waste” (IRCOW) project has come out with some interesting results of technical and non-technical nature related to managing Construction and Demolition Waste (CDW) as a resource of valuable materials which can be recovered for high-grade applications back in the

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characteristics and recoverability of low quality c ...

2019-10-18  process. This would allow high-quality crushed coarse aggregate with properties closest to those of the original to be recovered from concrete waste. 2. Complete recovery of coarse aggregates using microwave heating . Under the aforementioned circumstances, im-proving the quality of low-quality

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Waste-free technology for recycling concrete rubble ...

2020-2-20  An effective method of recycling concrete debris which allows its components to return to the construction process is wanted. This paper proposes a waste-free method of recycling concrete rubble based on thermal-mechanical treatment. The recycling process results in a high quality coarse aggregate and cement mortar.

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Improving the Quality of Mixed Recycled Coarse

2017-1-2  The primary objectives of this study are to investigate the feasibility of a heavy media separation process with magnetite (Fe 3 O 4 ) suspension for upgrading the quality of mixed recycled coarse aggregates from construction and demolition waste (CDW) in Korea and to determine a range of effective operating density of Fe 3O4 suspension for producing high-quality RCA ...

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Concrete Waste Recycling Process for High Quality

2008-1-15  @article{osti_21144165, title = {Concrete Waste Recycling Process for High Quality Aggregate}, author = {Ishikura, Takeshi and Fujii, Shin-ichi}, abstractNote = {Large amount of concrete waste generates during nuclear power plant (NPP) dismantling. Non-contaminated concrete waste is assumed to be disposed in a landfill site, but that will not be the solution especially in the future,

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Effective Recycling of Surface Modification Aggregate ...

aggregate is recovered from concrete waste for reuse (Tamura et al. 1997). In addressing this goal, this study also addresses the following relevant topics. − Saving energy from recycling − Producing high-performance concrete − Reducing the amount of waste concrete 2. Technical overview of complete recovery of SMCA using microwave heating

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Recycling aggregate from wasted concrete by pulsed ...

In Japan, the treatment of waste concrete scraps has been one of the environmental issues. Therefore, the new application using pulsed power technology has been developed as the recycling method of coarse aggregates in waste concrete scraps. In the work, the dependences of the quality of the recycled coarse aggregate on the consumption energy and gap distance were investigated and the best ...

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Development of High quality Recycled Aggregate

In this study, high quality recycled aggregate processing circuit was developed to recycle waste concrete. From the waste concrete which is a hydrated compound with coarse aggregate, fine aggregate, and cement material, high quality recycled coarse aggregate for concrete making was produced by autogenous milling and heat pretreatment method.

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COMPLETELY RECYCLABLE CONCRETE OF AGGREGATE

The increase of concrete strength is achieved by 1.2 times using improved coating agent mixed properly with silica-fume and by-product powder. The recovery of high-quality aggregate can also be achieved with low energy by using microwave heating selectively for coating layer. In addition, about 90% of original aggregate can be recycled.

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characteristics and recoverability of low quality c ...

2019-10-18  process. This would allow high-quality crushed coarse aggregate with properties closest to those of the original to be recovered from concrete waste. 2. Complete recovery of coarse aggregates using microwave heating . Under the aforementioned circumstances, im-proving the quality of low-quality

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Design Strategy for Recycled Aggregate Concrete: A

2021-6-17  The production of concrete requires the consumption of huge quantities of aggregates, as the global consumption of aggregate associated with construction was about 40 billion tons in 2014 [5]. The demand for aggregates is expected to double in the coming decades if the high demand for concrete persists. Consequently, the consumption of natural ...

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Design Strategy for Recycled Aggregate Concrete: A

Currently, a number of disadvantages hampers the use of recycled concrete aggregates (RCA). The current review proves that concretes made with complete replacement of natural aggregate with RCA allow the production of high-quality concrete. One of the possibilities for improving concrete properties with RCA is the use of extended curing and pozzolanic materials with varying cement ratios.

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Assessing the role and use of recycled aggregates in the ...

2020-1-9  Such aggregate is classified as recycled concrete aggregate (RCA) and careful control and monitoring of its quality is fundamental to ensure a high-performing concrete and ensure adequate properties, such as compressive strength and durability (Purnell and Dunster, 2009). RCA is generally derived from the crushing of isolated previously-used ...

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Quality protocol: aggregates from inert waste - GOV.UK

2013-10-22  The quality protocol sets out end of waste criteria for the production and use of aggregates from inert waste. If the criteria are met, the aggregates will normally be regarded as having been ...

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