• Title, Summary, Keyword: oyster shell

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Experimental study on the Physical and Mechanical Properties and Acid-Resistance of Concrete with Oyster Shell (패분을 혼입한 콘크리트의 물리.역학적 특성 및 내산성에 관한 실험적 연구)

  • 서대석;민정기;정현정;남기성;성찬용
    • Proceedings of the Korean Society of Agricultural Engineers Conference
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    • pp.319-323
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    • 1999
  • This study is performed to evaluate the physical and mechanical properties and acid-resistance of oyster shell concrete. The result shows that the unit weights of concrete with oyster shell are decreased by 1∼2% than that of the normla cement concrete. The highest strength is achieved by 2.5% oyster shell filled oyster shell concrete, it is increased compressive strength by 4% , tensile strength by 6% and bending strength by7% than that of the normal cement concrete, respectively . The acid-resistanceis increased with increase of the content of oyster shell. It is 1.6 times of the normal cement concrete by 15% oyster shell filled oyster shell concrete. Accordingly, oyster shell concrete will improve the properties of concrete.

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Applicability of Oyster Shell to Concrete Ingredients (굴패각의 콘크리트 잔올재로의 활용성)

  • 양은익;손명수;김학모;정용일
    • Proceedings of the Korea Concrete Institute Conference
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    • pp.501-506
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    • 2001
  • An experimental study was carried out to investigate recycling of an oyster shell, which is disposed in open-dumped way at coastal oyster factory area. For this purpose, the chemical component and reaction of oyster shell with cement paste was examined. And, the characteristics of hardened concrete was quantitatively investigated in terms of fineness modulus and blending rate of the crushed oyster shell. Test results show that interaction between oyster shell and cement paste was not occurred and the crushed oyster shell can be used as the fine aggregate of concrete. And it is found that blending of an oyster shell caused not to reduce the 28 day compressive strength of concrete. Elastic modulus of the concrete blended with crushed oyster shells decreases with increases the blending rate which the modulus reduced about 10% when oyster shells is blended up to the 20% of the sand substitution.

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Oyster Shell Disposal: Potential as a Novel Ecofriendly Antimicrobial Agent for Packaging: a Mini Review

  • Sadeghi, Kambiz;Park, Kitae;Seo, Jongchul
    • KOREAN JOURNAL OF PACKAGING SCIENCE & TECHNOLOGY
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    • v.25 no.2
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    • pp.57-62
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    • 2019
  • The management of oyster shell disposal is an ongoing challenge in the southern coast of Korea because of continuously dumping the oyster shell in environment. Oyster shell wastes could be a biocidal alternative after calcination using a heat treatment. Calcined oyster shell is normally obtained through thermally conversion of $CaCO_3$ (main component in oyster shell (96%)) into CaO. This study provides a brief overview of oyster shell disposal and its potential as an antimicrobial agent with a focus on calcination process, antimicrobial mechanisms, and packaging applications.

An Experimental Study on Nondestructive Properties of Crushed Oyster Shell Concrete (패분 콘크리트의비파괴 특성에 관한 실험적 연구)

  • 성찬용
    • Magazine of the Korean Society of Agricultural Engineers
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    • v.42 no.2
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    • pp.93-98
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    • 2000
  • This study is performed to evalute experimentally the nondestructive properties on the concrete that is treated with crushed oyster shell powder of 0.15m or smaller in diameter. The ultrsonic pulse velocity of crushed oyster shell concrete(COSC) is in the range of 4.110-4.267m/s, and the dynamic modulus of elasticity of COSC range from 288$\times$10$^3$ to 318 $\times$10$^3$kgf/$\textrm{cm}^2$. The ultrasonic pulse velocity and dynamic modulus of elasticity are similar to those of normal portland cement concrete. The highest ultrasonic pulse velocity and dynamic modulus of COSC are measured at the 2.5% addition rate by weight of crushed oyster shell powder. The acid-resistance in increased of the content of crushed oyster shell powder. The acid-resistance of COSC with 15% addition rate by weight of crushed oyster shell power is 1.6 times greater than that of normal portland cement concrete. It is concluded that the addition of crushed oyster shell powder to normal portland cement concrete contributed to improve the nondestructive properties of concrete.

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Physical and Mechanical Properties of Concrete with Oyster Shell (패분을 혼입한 콘크리트의 물리.역학적 특성)

  • 성찬용
    • Magazine of the Korean Society of Agricultural Engineers
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    • v.41 no.4
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    • pp.86-91
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    • 1999
  • This study is performed to evaluate the physical and meanical properties of oyster shell concrete. The result shows that the unit weights of concrete with oyster shell are less by 15 ~2% than that of the normla cement concrete. The highest strengths are achieved by 2.5% oyster shell concrete , with increased compressive strength by 4% , tensile strength by 6% and bending strength by 7% than that of the normal cement concrete, respectively. The static modulusof elasticity is in the range of 290$\times$10$^3$~314 $\times$10$^3$kgf/㎤ for 2.5~7.0% oyster shell concrete,which has showed about the same compared to that of the normal cement concrete. The Poisson's number of oyster shell concrete is less than that of the normal cement concrete. Accordingly, oyster shell concrete will improve the properties of concrete.

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A study on the Calcination Characteristics and Supporter for Durability using waste shell such as Crassostrea gigas (패각의 소성 특성 및 지속성 담지체 제조에 관한 연구)

  • Kim, Yong-Ryul;Yoon, Cheol-Hun
    • Journal of the Korean Applied Science and Technology
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    • v.26 no.2
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    • pp.143-150
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    • 2009
  • Today, wastes of much quantity by fast industrialization and increase in population, population concentration etc. of modem society are increasing. Much oyster shell is breeding by character and conduct of oyster-industry for a long time among them. Oyster shell which breed by-product in oyster cultivating industry that specific gravity of domestic seashore cultivating industry is high is causing environmental problem by problem and so on hindrance, nature spectacle's waste and health hygiene on administration if it is pollution of district along the coast fishing ground, number of public ownership being stored in open area in seashore. About new material just-in-time through recycling and he of oyster shell by these problem wide that study. Go forward more and investigate special quality that is oyster shell's physical chemistry red in this research and oyster shell oyster shell which cause several environmental problems developing ability agricultural chemicals that use this encapsulating micro by ability carrier that is environmentally application possibility examine wish to.

The Characteristics of Municipal wastewater Sludge Dewatering Using Oyster Shell Powder (굴껍질을 이용한 하수슬러지의 탈수특성에 관한 기초연구)

  • 신남철;문종익;정유진;장혜정;성낙창
    • Journal of Environmental Health Sciences
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    • v.26 no.2
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    • pp.30-33
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    • 2000
  • The objective of this study is to examine the subsitiution effect of the waste oyster shell powder as the conditioning agent in municipal wasterwater sludge dewatering process. Beacuse the oyster shells have a large amount(about 38% by weight) of alkaline minerals, such as calcium and magnesium, they are thought to have the potential as a good conditioning agent. In this study, the physico-chemical properties of powdered oyster shells (75${\mu}{\textrm}{m}$ or 200 mesh) and the dewatering characteristics of municipal waste water sludge using powdered oyster shells and CaCO3 are investigated. The conclusions are as follows, 1. Oyster shell could produce calcium ions up to 14ppm at pH-7.0, and this represents that oyster shell is a potential properties as a good conditioner. 2. 100ml of wastewater sludges, conditioned with pretreated oyster shell, are dewatered to the level of 25% solid concentration. 3. Wasterwater sludges, conditioned with oyster shell and CaCO3 are dewatered to the level of 32% solid concentration. And this shows that two-stage combined conditioning process is desirable than the one-stage conditioning process.

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Egg Shell and Oyster Shell Powder as Alternatives for Synthetic Phosphate: Effects on the Quality of Cooked Ground Pork Products

  • Cho, Min Guk;Bae, Su Min;Jeong, Jong Youn
    • Food Science of Animal Resources
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    • v.37 no.4
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    • pp.571-578
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    • 2017
  • This study aimed to determine the optimal ratio of natural calcium powders (oyster shell and egg shell calcium) as synthetic phosphate replacers in pork products. Ground pork samples were subjected to six treatments, as follows: control (-) (no phosphate added), control (+) (0.3% phosphate blend added), treatment 1 (0.5% oyster shell calcium powder added), treatment 2 (0.3% oyster shell calcium powder and 0.2% egg shell calcium powder added), treatment 3 (0.2% oyster shell calcium powder and 0.3% egg shell calcium powder added), and treatment 4 (0.5% egg shell calcium powder added). The addition of natural calcium powders resulted in an increase in the pH values of meat products, regardless of whether they were used individually or mixed. The highest cooking loss was observed (p<0.05) in the negative control samples, whereas the cooking loss in samples with natural calcium powder added was similar (p>0.05) to that in the positive control samples. CIE $L^*$ values decreased as the amount of added egg shell calcium powder increased. CIE $a^*$ values were higher (p<0.05) in samples containing natural calcium powder (treatments 1, 2, 3, and 4) than in the positive control. The combination of oyster shell calcium powder and egg shell powder (treatment 2 or 3) was effective for the improvement of textural properties of the pork products. The findings show that the combined use of 0.2% oyster shell calcium and 0.3% egg shell calcium should enable the replacement of synthetic phosphate in the production of cooked pork products with desirable qualities.

A Study on the Estimation of Greenhouse Gas Using Oyster Shell Recycling for Paper Filler

  • Park, Seung-Chel;Seo, Ran-Sug;Kim, Sung-Hu
    • Journal of Environmental Science International
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    • v.25 no.1
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    • pp.23-29
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    • 2016
  • This study has conducted greenhouse gas emission reduction test as using Oyster-shells originated PCC paper filler compare to non-Oyster shells used PCC. This examination was estimated and calculated in accordance with both IPCC (Intergovernmental Panel on Climate Change) and World Business Council for Sustainable Development (WBSCD). The greenhouse gas emission reduction estimation result indicates that, when oyster shells are recycled and used as paper filler, it reduces $27.97tCO_2\;per\;100\;ton$ of oyster shells. It is greenhouse gas emission $44.27tCO_2$ from PCC production changed to carbon emission reduction when replaced with oyster shell. LNG greenhouse gas emission $16.3tCO_2$ in relation to the pre-treatment with oyster shell per 100 ton is also reflected. As a result, it is assumed that roughly $0.2797tCO_2/oyster\;shell{\cdot}ton$.

Evaluation of Improvement on Sediment for Practical Application in Prawn Farm (새우 양식장에 적용을 위한 저질개선 평가)

  • Kim Woo-Hang;Kim Doo Hee
    • Proceedings of KOSOMES biannual meeting
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    • pp.81-84
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    • 2004
  • Control of Sediment is very important in prawn farm due to the eruption of toxic material such as W1ionized H2S, NH3 and NO2-. In this study, column test study, column with filter media such as activated carbon, zeolite, oyster shell and iron chloride to evaluate the reduction of toxicity from sediment ammonia-N(NH3) was effectively removed by Zeolite and oyster shell. It was indicated that ammonium ion(NH4+) was removed by ion exchange of zeolite. And the ammonia in the column of oyster shell was existed as the form of NH4+, which is not toxic for prawn because oyster shell was stably kept around pH 8. Therefore, some of ammonia(NH3) was reduced by oyster shell. Hydrogen sulfide and COD were effectively removed by adsorption of activated carbon and a partial removal of hydrogen sulfide was accomplished by Oyster shell. Phosphorous was removed by activated carbon, oyster shell and iron chloride. In prawn farm, the concentration of ammonia was increased with increase of pH by algae photosynthesis in the column of activated carbon, zeolite and iron chloride, but it was revealed that pH was stably kept in the column of oyster shell.

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