• Title/Summary/Keyword: 배합비

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Quality Characteristics of Brown Rice Dasik using Modified Potato Starch (감자 변성 전분 배합 비율에 따른 현미다식의 품질 특성)

  • Kim, Ae-Jung;Joung, Kyung-Hee;Han, Myung-Ryun
    • The Korean Journal of Food And Nutrition
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    • v.23 no.1
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    • pp.88-93
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    • 2010
  • The principal objective of this study was to evaluate the physicochemical characteristics of brown rice Dasik prepared with different 5 levels(0, 25, 50, 75, 100%) of modified potato starch powder. We assessed the general compositions, Hunter's color values, the mechanical characteristics, and conducted a sensory evaluation analysis of brown rice Dasik at room temperature($20^{\circ}C$). The more modified potato starch powder composition was increased, the content of ash, protein and fat were significantly decreased(p<0.05). We noted that the luminance of samples were increased the more modified potato starch powder composition was increased, but in Hunter's a and b values were decreased. With regard to the mechanical properties of the Dasik samples, we noted significant differences in hardness, gumminess, chewiness but no differences in springiness, cohesiveness and adhesiveness were detected. The more modified potato starch powder composition was increased, the more the score of hardness, gumminess and chewiness were higher. The results of sensory evaluation showed that there were significant differences on the color, sweetness, mouth-feel, chewiness, overall quality of the Dasik samples(p<0.05). The score of brown rice Dasik with 50%(w/w) modified potato starch(BM2) in color, mouth-feel, chewiness, overall quality were significantly increased than those of other samples.

Case Study on the Mixing Proportions of 100 Year Life Time Concrete (내구수명 100년 해양 콘크리트의 배합사례)

  • Jang, Bong-Seok;Ahn, Jeong-Hwan
    • Proceedings of the Korea Concrete Institute Conference
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    • 2008.04a
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    • pp.1073-1076
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    • 2008
  • This study shows some results of concrete mixing design has 100 years life time. The ratios of ternary blended cement are 4 types. the ratios of blast furnace slag cement are 3 types. In this case study, 40%, 50% and 60% replacement ratio of blast furnace slag(BSF) to OPC are used, also 35:45:20, 30:35:35, 30:40:30 and 35:40:25 ratio of OPC:BSF:FA are used. The mixing design tests include slump, air content, compressive strength and thermal properties of concrete. The compressive strength tests are executed at the age of 3, 7, 28, 56, and 91 days. The coefficient of chloride diffusion is determined by NT Build 492 method. The purpose of this study is to shows the results of case studies as the ratio of blended cement varies.

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Contribution of Two-Stage Mixing Approach on Compressive Strength of Mortar Made of Recycled Fine Aggregate (2단계 배합방법이 순환잔골재 혼입 모르타르의 압축강도에 미치는 영향)

  • Kim, Yu-Jin;Kim, Gyu-Won;Chung, Chul-Woo
    • Journal of the Korean Recycled Construction Resources Institute
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    • v.8 no.4
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    • pp.490-497
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    • 2020
  • This work has been initiated to find possibility whether recycled fine aggregate can be used as a source of aggregate for structural concrete or not. Two-stage mixing approach was chosen in order to maximize strength potential from recycled fine aggregate. Moisture content of the recycled fine aggregate was changed, and two different types of two-stage mixing approaches were applied to produce cement mortar. The strength of mortar made of 100% recycled fine aggregate by two-stage mixing approaches was compared to that of mortar made of 100% washed sea sand. According to the results, the effect of moisture content on compressive strength was observed from low water cement mortar(W/C 0.3). In case of W/C 0.5 cement mortar, no clear relationship was observed between moisture content and strength development. It was found that two-stage mixing approach has a potential to increase the strength of mortar made of 100% recycled fine aggregate. In case of modified version of two-stage mixing approach which first prepares cement paste and pours recycled fine aggregate into the cement paste, was more effective to increase the strength of mortar made of 100% recycled fine aggregate.

The Fundamental Characteristics for Mix Proportion of Multi-Component Cement (배합비에 따른 다성분계 시멘트의 기초특성)

  • Kim, Tae-Wan;Jeon, Jae-Woo;Seo, Min-A;Jo, Hyeon-Hyeong;Bae, Su-Yeon
    • Journal of the Korea institute for structural maintenance and inspection
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    • v.20 no.3
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    • pp.66-74
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    • 2016
  • The aim of this research work is to investigate the mix proportion of multi-component cement incorporating ground granulated blast furnace(GGBFS), fly ash(FA) and silica fume(SF) as an addition to cement in ternary and quaternary combinations. The water-binder ratio was 0.45. In this study, 50% and 60% replacement ratios of mineral admixture to OPC was used, while series of combination of 20~40% GGBFS, 5~35% FA and 0~15% SF binder were used for fundamental characteristics tests. This study concern the GGBFS/FA ratio and SF contents of multi-component cement including the compressive strength, water absorptions, ultrasonic pulse velocity(UPV), drying shrinkage and X-ray diffraction(XRD) analysises. The results show that the addition of SF can reduce the water absorption and increase the compressive strength, UPV and drying shrinkage. These developments in the compressive strength, UPV and water absorption can be attributed to the fact that increase in the SF content tends basically to consume the calcium hydroxide crystals released from the hydration process leading to the formation of further CSH(calcium silicate hydrate). The strength, water absorption and UPV increases with an increase in GGBFS/FA ratios for a each SF contents. The relationship between GGBFS/FA ratios and compressive strength, water absorption, UPV is close to linear. It was found that the GGBFS/FA ratio and SF contents is the key factor governing the fundamental properties of multi-component cement.

A Fundamental Study on the Optimal Mix Proportion for Antiwashout Underwater Concrete (수중 비분리 콘크리트의 최적 배합비에 관한 기초적 연구)

  • 진치섭;김희성;한태영
    • Magazine of the Korea Concrete Institute
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    • v.7 no.6
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    • pp.224-232
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    • 1995
  • Recently, in other.view of underwater concrete construction, special admixture agent of concrete has been developed for antiwashout of concrete under water with easy carrying out method in some foreign nations. They had successful cases in experiment and construction and it trend to use in many cases with many scales. However, in domestic, there was rare record in carrying out. In this paper, reference for successful results of experiment and construction about antiwashout underwater concrete, as variable add of special admixture agent and other agents. We have carried out property tests of fresh and hardened concrete, certified the properties and made the antiwashout underwater concrete have enough strength to endure with ea.sy construction. And we have decided the optimal mix proportion for antiwashout underwater concrete under standard state.

A Study on the Protection Method of Mine Site Slope Using Mine Green Framework (식생 방틀공법을 이용한 광산사면 보호공법에 관한 연구)

  • Choi, Gwang-Su;Kim, Tae-Heok;Kwon, Hyun-Ho
    • Tunnel and Underground Space
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    • v.19 no.6
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    • pp.526-533
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    • 2009
  • This study presents Mine Green Framework(M.G.F) which can protect the slope of rock and tailings. M.G.F method provides the fiber frame which helps the growth of the plant in the barren site like mined rock slope. M.G.F system consists of the polyester fiber mat, soil, seeds and anchors for the attachment. The optimum rate of filling materials was figured out by many germination tests in order to improve the effect of filling materials and the optimum rate of filling materials was applied in four test sites individually. High rooting rate over 70% was confirmed in all field tests. Especially the moisturizer was the most important component of filling materials and it could make the better condition for the plants.

An Analysis on the Properties of Cement Mortar using Sewage Sludge Incineration Ash (하수슬러지 소각재를 이용한 시멘트 모르타르의 특성분석)

  • Ryu, Heon-Ki;Park, Jeong-Min
    • Journal of the Korean Recycled Construction Resources Institute
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    • v.5 no.3
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    • pp.55-62
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    • 2010
  • This is an experimental research in order to judge the applicability of sewage sludge incineration ash having applied the mixing proportion needed to manufacture bricks and to do plaster work with addition of hwangtoh and slaked lime as a part of the methods for utilizing the wastes produced from sewage sludge incineration ash. Based on the results from experiment and analysis, it is judged that, in case of mixing proportion of 1:2 for the purpose of plastering and masonry work, the cement mortar produced by using a 10% addition ratio of sewage sludge incineration ash with mixture of hwangtoh covering all range of addition ratio, and also the cement mortar produced by using a 20% of sewage sludge incineration ash together with 0% and 10% addition ratio of hwangtoh, was possible to be applied to the practical use. In case of mixing proportion of 1:7 for manufacture of bricks and blocks, if such brick and block products are produced with 10% and 20% addition ratio of sewage sludge incineration ash having added aggregate fines or stone dust that has been actually used in brick and block manufacturing, it is judged that these bricks and blocks could be practically used in the job sites, although strength development is a little bit lower.

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Monitoring on Recipe of Old Pumpkin Extract Drink (늙은 호박 추출물 음료 배합비의 모니터링)

  • 윤선주;김경은;정용진
    • Food Science and Preservation
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    • v.10 no.3
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    • pp.308-313
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    • 2003
  • In the present study, we investigated the optimum recipe of the pumpkin drink using old pumpkin extract. Response surface methodology (RSM) was applied to optimize and monitor the drink recipe with pumpkin extract. The polynomial equation for color, flavor, taste, mouth feel, overall palatability, pH, brix and viscometer showed 0.7682, 0.9046, 0.9364, 0.9110, 0.8456, 0.9264, 0.7135 and 0.9906 of R$^2$, respectively and flavor, taste, mouth feel, overall palatability, pH and viscometer showed 5~10% of significance level. The optimum ranges of recipe on organoleptic properties of pumpkin pouch drink were estimated on 86.5~87.5% of the old pumpkin extract, 0.36~0.42% of xanthan gum and 9% of vinegar.

Strength Characteristics of Mortar Mixture Soil with Oyster shell (굴패각을 혼입한 모르타르 혼합토의 강도특성 연구)

  • 윤길림;김병탁;김준형;채영수;서승남;심재설
    • Journal of the Korean Geotechnical Society
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    • v.17 no.5
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    • pp.51-60
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    • 2001
  • 연안역 굴양식장에서 발생하여 폐기물로 분류되어 불법으로 버려지는 굴패각을 파쇄하여 혼합한 모르타르 혼합토의 특성을 규명하고자 압축강도 시험을 포함한 다양한 실내시험을 수행하였다. 압축강도시험을 위하여 준비한 모르타르 공시체는 시멘트, 물, 모래 및 굴패각을 다양한 배합비로 혼합하여 제작하였다. 강도시험결과에 따르면 분쇄한 굴패각의 비율이 최대 모래중량의 40%까지 혼합한 경우에도 굴패각을 섞지 않은 일반 모르타르 혼합토에 비하여 압축강도가 크게 감소하지 않았다. 본 연구에서 수행한 압축강도실험을 분석한 결과, 다양한 크기로 파쇄한 굴패각을 적절한 혼합비의 모래 및 시멘트와 배합하여 사용한다면 건설재료로서의 재활용 가능성이 충분한 것으로 판단되었다.

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Optimum Mix Design of Concrete Incorporating Waste Foundry Sand (폐주물사를 혼입한 콘크리트의 적정배합설계)

  • 박제선;윤경구;김태경;백민경
    • Magazine of the Korea Concrete Institute
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    • v.9 no.6
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    • pp.195-206
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    • 1997
  • 산업폐기물인 폐주물사를 재활용하여 에너지절감과 환경오염방지효과를 얻을 수 있다. 반요인실험법을 사용하여 폐주물사를 잔골재에 일정비율 치환한 콘크리트의 적정배합설계제시를 위한 예비실험에서 물-시멘트비, 폐주물사의 잔골재치환율, 잔골재율, 슬럼프와 같은 주요변수와 변수사이의 2차상호작용을 파악하였다. 예비실험결과 폐주물사의 잔골재치환율 70%까지 실시하였을 때 폐주물사를 혼입한 콘크리트의 강도 발현에 가장 중요한 변수는 물-시멘트비로 분석되었고 폐주물사의 잔골재치환율은 거의 영향이 없는 것으로 분석되어 폐주물사를 콘크리트의 잔골재로 대체할 수 있음을 알 수 있었다. 각 변수의 2차상호작용에서는 폐주물사의 잔골재치환율과 잔골재율의 상관관계가 콘크리트의 강도발현에 가장 큰 영향을 미치는 것으로 나타났다. 목표압축강도에 대한 적정배합조건을 폐주물사의 잔골재 치환율에 따라 물-시멘트비, 잔골재율에 대해 제시하였다.