• Design & Manufacturing
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• 제18권2호
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• pp.57-63
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• 2024

In this study, the recyclability of commonly used PP (polypropylene) and ABS (acrylonitrile butadiene styrene) was evaluated by molding test specimens from mixture of virgin and shredded material, followed by measuring their strength properties, Experiments were conducted o two type of PP (transparent and non-transparent) and two types of ABS (white and yellow). Test specimens for each resin were prepared with shredded material ratios ranging from 10% to 50% in 10% increments. Changes in tensile strength, elastic modulus, and elastic limit were analyzed based on the mixing ratio of the shredded material. The experimental results demonstrated that the strength properties of all the resins remained consistent within a certain range, even with increasing proportions of shredded material. For transparent PP, the tensile strength ranged from 30.87± MPa, the elastic modulus from 1.23±0.04 GPa, and the elastic limit from 19.17±0.44%. Non-transparent PP exhibited a tensile strength ranging from 27.71±0.58 MPa, an elastic modulus from 1.03±0.06 GPa, and an elastic limit from 17.35±0.41%. For ABS, white ABS had a tensile strength of 39.42±0.28 MPa, an elastic modulus of 1.94±0.01 GPa, and an elastic limit of 36.76±0.25%. Yellow ABS showed a tensile strength of 39.25±0.78 MPa, an elastic modulus of 1.94±0.01 GPa, and an elastic limit of 37.14±0.23%, with values remaining consistent within this range. Based on these results, it was confirmed that the mechanical properties of the resins used in this study do not change significantly when mixed with recycled shredded material, indicating excellent mechanical recyclability.

• 한국주조공학회지
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• 제41권1호
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• pp.11-15
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• 2021

주철공장의 용해 공정에 사용되는 고철 장입재는 거의 대부분 생압고철(Press Scrap)이다. 생압고철은 에너지 손실, 작업성, 안전 등 문제들을 야기할 수 있다. 생압고철 대신 파쇄고철(Shredded Scrap)을 사용함에 따라, 앞서 언급한 문제들을 해결할 수 있을 것으로 기대한다. 본 연구에서는 3t/h 중주파 유도 용해로에서 주철의 용해 시, 생압고철과 파쇄고철을 사용함에 따른 에너지 원단위(Power Basic Unit)를 비교하였다. 생압고철 대신 파쇄고철을 장입하면, 에너지 원단위가 약 15% 향상되는 것으로 확인되었다. 고철의 형상, 크기에 따른 사용 측면 특징과 제약사항을 고찰하였다.

• 한국주조공학회지
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• 제41권2호
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• pp.132-138
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• 2021

본 연구에서는 16t/h 저주파 유도 용해로에서 주철의 용해 시, 생압고철(Press Scrap)과 파쇄고철(Shredded Scrap)을 사용함에 따른 에너지 원단위(Power Basic Unit)를 비교하였다. 생압고철 대신 파쇄고철을 장입하면, 에너지 원단위가 약 5% 향상되는 것으로 확인되었다. 고철의 형상, 크기에 따른 에너지 측면 특징과 용해로 크기의 영향을 고찰하였다. 마지막으로 본 기술의 활용성을 제고하기 위한 전략을 제안하였다.

• Geomechanics and Engineering
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• 제9권4호
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• pp.447-464
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• 2015

Millions of scrap tires are discarded annually in Turkey. The bulk of which are currently landfilled or stockpiled. These tires consume valuable landfill space or if improperly disposed, create a fire hazard and provide a prolific breeding ground for rats and mosquitoes. Used tires pose both a serious public and environmental health problem which means that economically feasible alternatives for scrap tire disposal must be found. Some of the current uses of scrap tires are tire-derived fuel, creating barrier reefs and as an asphalt additive in the form of crumb rubber. However, there is a much need for the development of additional uses for scrap tires. One development the creation of shreds from scrap tires that are coarse grained, free draining and have a low compacted density thus offering significant advantages for use as lightweight subgrade fill and backfill material. This paper reports a comprehensive laboratory study that was performed to evaluate the use of a shredded tire-sand mixture as a backfill material in trench conditions. A steel frame test tank with glass walls was created to replicate a classical trench section in field conditions. The results of the test demonstrated that shredded tires mixed with sand have a definite potential to be effectively used as backfill material for buried pipe installations.

• Structural Engineering and Mechanics
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• 제63권2호
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• pp.217-223
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• 2017

Glass fiber reinforced gypsum panels (GFRG) are hollow panels made from modified gypsum plaster and reinforced with chopped glass fibers. The hollow cores of panels can be filled with in-situ concrete/reinforced concrete or insulation material to increase the structural strength or the thermal insulation, respectively. GFRG panels are unfilled when used as partition walls. As load bearing walls, the panels are filled with M 20 grade concrete (reinforced concrete filling) in order to resist the gravity and lateral loads. The study was conducted in two stages: First stage involves formulation of the alternate light weight mix by conducting experimental investigations to obtain the optimum combination of phosphogypsum and shredded thermocol. In the second stage the alternate mixes are filled in GFRG panels and experimental investigations are conducted to compare the performance against panels filled with conventional M 20 mix.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2001년도 The 6th International Symposium of East Asian Resources Recycling Technology
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• pp.693-698
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• 2001

This paper establishes a coding method system including the liberation and size distribution of recycling materials in the shredder operation. Every particle in the shredded product becomes a code number using the liberation model and size distribution equation transforming of weight percentage into particles number percentage. One set of database can be obtained after all particles have been coded. This database is suitable for the size reduction operation in the process simulation of waste recycling. Coupling with the developed air classification, sizing and separating operations, the whole process simulation will be completely established for diversified application. A typical simulation for the rolling cutting shredder product of waste TV had been demonstrated under this coding system. The breakage size distribution of Gaudin and Schumann equation were selected for the shredding operation simulation. The Gaudin's liberation model was suitable fur the liberation simulation. Both of these equations were transformed weight percentage into particles distribution for the necessary of particle coding method. A better recycling operation for this shredded solid waste can be concluded from the comparison of simulation results with their sorted grade, recovery or economic of materials in different processes.

• 한국연초학회지
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• 제19권2호
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• pp.159-161
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• 1997

A study on the optimal drying condition by a vacuum drying oven was done using shredded tobacco lamina and commercial cigarettes ('This'). Changes in the mass of the experimental material were monitored for about 50 hrs at 6 different temperatures (5$0^{\circ}C$~10$0^{\circ}C$, 1$0^{\circ}C$ stepwise) while continuously operating a vacuum pump. After 30 hrs, small amount of samples from each material were taken sequentially to monitor changes in moisture content using a Karl-Fischer method (Metrohm KF 701 Titrino). Absolute moisture contents calculated from the measurements indicated an ideal data distribution could be obtained by drying at temperatures between 7$0^{\circ}C$~8$0^{\circ}C$. Results from cigarette products which contains humectant and tobacco lamina without it were compared.

• Archives of Pharmacal Research
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• 제26권8호
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• pp.601-605
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• 2003

Traditional taxonomic methods used for the identification and differentiation of ginsengs rely primarily on morphological observations or physiochemical methods, which cannot be used efficiently when only powdered forms or shredded material is available. Randomly amplified polymorphic DNA (RAPD) was used to determine the unique DNA profiles that are characteristic not only of the genus Panax but also of various Panax subgroups collected from five different countries. RAPD results of OP-5A primer showed a specific single band that is characteristic of all ginseng samples. RAPD results of OP-13B primer demonstrated that OP-13B primer could be used as a unique RAPD marker to differentiate Panax species. These results support that this approach could be applied to distinguish Korean Ginseng (Panax ginseng) from others at the molecular level.

• Geomechanics and Engineering
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• 제22권3호
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• pp.197-206
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• 2020

Reutilization of solid waste such as Tire Derived Aggregate (TDA) and mixing it with soft soil for backfill material not only reduces the required volume of backfill soil (i.e., sand-mining procedures; reinforcement), but also preserves the environment from pollution by recycling. TDA is a widely-used material that has a good track record for improving sustainable construction. This paper attempted to investigate the performance of Kaolin-TDA mixtures as a backfill material underneath a strip footing and close to a retaining wall. For this purpose, different types of TDA i.e., powdery, shredded, small-size granular (1-4 mm) and large-size granular (5-8 mm), were mixed with Kaolin at 0, 20, 40, and 60% by weight. Static surcharge load with the rate of 10 kPa per min was applied on the strip footing until the failure of footing happened. The behaviour of samples K80-G (1-4 mm) 20 and K80-G (5-8 mm) 20 were identical to that of pure Kaolin, except that the maximum footing stress had grown by roughly three times (300-310 kPa). Therefore, it can be concluded that the total flexibility of the backfill and shear strength of the strip footing have been increased by adding the TDA. The results indicate that, a significant increase in the failure vertical stress of the footing is observed at the optimum mixture content. In addition, the TDA increases the elasticity behaviour of the backfill.

• Advances in concrete construction
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• 제5권6호
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• pp.575-586
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• 2017

The disposal of polythene waste and fly ash is causing serious threat to the environment. Aim of this study is to decrease environmental pollution by using polythene waste and fly ash in concrete. In this study, cement was partially replaced with 0%, 5%, 10%, 15% and 20% fly ash (by weight) and plastic waste was added in shredded form at 0.6% by weight of concrete. The specimens were prepared for the concrete mix of M25 grade and water to cementitious material ratio (w/c) was maintained as 0.45. Fresh concrete property like workability was examined during casting the specimens. Hardened properties were found out by carrying out the experimental work on cubes, cylinders and beams which were cast in laboratory and their behavior under test were observed at 7 & 28 days for compressive strength and at 28 days for density, flexural strength, dynamic modulus of elasticity, abrasion resistance, water permeability and impact resistance. Overall results of this study show that addition of 0.6% (by weight of the concrete) plastic waste with 10% (by weight of cement) replacement of cement by fly ash result an improvement in properties of the concrete than conventional mix.