• Title/Summary/Keyword: form material

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A Study on the Applicability of Multipurpose Functional Synthetic Resin Formworks (다목적 기능 합성수지 거푸집 현장 적용성에 관한 연구)

  • Kim, Tae-Hui;Ahn, Sung-Jin;Lee, Young-Do;Choi, Suk;Nam, Kyung-Yong
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2018.11a
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    • pp.143-144
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    • 2018
  • This study the workability of synthetic resin form was examined through field application. results there was no warping or bulging of the mold during concrete placement in the field application. Also, the concrete surface finish of synthetic resin form was better than that of euro-form.

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A Study on the Characterization of Gum Vulcanizates by Strain Energy Function of Hyperelastic Material (가황 고무의 변형 에너지 함수를 통한 재료 특성화 방법에 관한 연구)

  • 박현철;윤성기
    • Transactions of the Korean Society of Mechanical Engineers
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    • v.16 no.7
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    • pp.1341-1350
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    • 1992
  • This paper addresses the practical problem of finding a useful strain energy function of the incompressible rubberlike materials. It examines methods by which the form of the functions are determined and shows how the selection of experimental data influences the resulting form of the functions. From this information, an optimal choice of the form of energy functions becomes possible. Phenomenological theories used in this paper are limited to elastic, incompressible material models. Due to the nature of the phenomenological methods, these theories are accurate only for the materials treated. However, they serve as a starting basis for the study of more complicated material behaviors.

Performance Analysis of the Flexible Manufacturing System According to the Strategy of Material Handling System Using Moment Generating Function Based Approach (모멘트 생성 함수 기법을 이용한 물류 운반 시스템 이용에 따른 유연 생산 시스템의 성능 해석)

  • 양희구;김종원
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 1995.10a
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    • pp.1186-1190
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    • 1995
  • This paper is focused on the formulation of explicit closed-form functions describing the performance measures of the general flexible manufacturing system (FMS)according to the strategy of material handling system(MHS). the performance measures such as the production rate, the production lead-time and the utilization rate of the general FMS are expressed, respectively, as the explicit closed-form functions of the part processing time, the service rate of the material handling system (MHS) and the number of machine tools in the FMS. For this, the gensral FMS is presented as a generalized stochastic Petri net model, then, the moment generating function (MGF) based approach is applied to obtain the steady-state probabity formulation. Based on the steady-state formulation, the explicit closed-form functions for performance measures of the probability FMS can be obtained. Finally, the analytical results are compared with the Petri net simulation results to verify the validity of the suggested method. The paper is of significance in the sense that it provides a comprehensive formula for performance measures of the FMS even to the industry engineers and academic reademic resuarchers who have no background on Markov chain analysis method or Petrinet modeling

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Mechanism of Apatite Formation on Bioactive Titanium Metal

  • Kim, Hyun-Min;Takadama, Hiroaki;Miyaji, Fumiaki;Kokubo, Tadashi;Nishiguchi, Shigeru;Nakamura, Takashi
    • The Korean Journal of Ceramics
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    • v.4 no.4
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    • pp.336-339
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    • 1998
  • Bioactive titanium metal can be prepared by simple 5M-NaOH treatment and subsuquent heat treatment at $600^{\circ}C$ to form an amorphous sodium titanate on its surface. In the present study, mechanism of apatite formation on the titanium metal was investigated by examining its surface compositional and structural changes in a simulated body fluid. The apatite formation on the metal was found to proceed in the sequence of 1)$Na^+$ ion release from the sodium titanate to form hydrated titania abundant in Ti-OH groups, 2) early and selective binding of calcium ions with the Ti-OH groups to form a calcium titanate, and 3) late binding of phosphate ions to make apatite nucleation and growth. This indicates that Ti-OH groups do not directly induce the apatite nucleation, but via formation of a calcium titanate.

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The mold form coating material research for the exposure concrete surface control (노출콘크리트 표면처리를 위한 거푸집 코팅재료 연구)

  • Lee, Young-Do
    • Journal of the Korea Institute of Building Construction
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    • v.10 no.5
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    • pp.137-143
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    • 2010
  • This research is a comparative analysis of the surface gloss of concrete depending on the coating material added to the cast, and includes analyses of the surface gloss of specimens made of cement mortar, with and without the addition of superplasticizer. In terms of coating material, the 7th material, which is part of a liquid packaging material, was shown to have the highest gloss, and was followed by the 3rd material, which uses transparent film. As the level of gloss is shown to vary depending on the material used for the coating film, it can be interpreted that the surface gloss can differ depending on surface particles and chemical composition factors. To make a concrete surface smooth, it is more effective to use a coating material with impermeability and a highly dense surface.

An Experimental Study on the Application of Lib-lath Form (리브라스 거푸집의 적용을 위한 실험적 연구)

  • Nam, Jung-Min;Park, Moo-Young;Lee, Young-Do;Jung, Sang-Jin
    • Journal of the Korea Institute of Building Construction
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    • v.4 no.4
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    • pp.103-108
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    • 2004
  • In order for concrete as a basic material constituting reinforced concrete structure to meet the required performance, it is necessary to satisfy various requirements in concrete construction. Among them, form work has significant effects not only on the process of molding fresh concrete but also on the quality and performance of hardened concrete. Recently, the decrease and aging of form workers is becoming a great problem in the construction industry and, as a result, it is required to rationalize form works and reduce labor costs for employing form workers. Because form construction methods decide the type of form according to required performance, it is necessary to develop various form construction methods and examine their performance. Thus the present study purposed to expand the scope of application of form construction methods and, for this purpose, investigated the basic characteristics of rib- lath form and presented a system form construction method.

An Experimental Study on Development of Design-Concrete used Building Wall (건축외벽용 의장콘크리트 개발에 관한 실험적 연구)

  • 임현준;김종원;강태경;김우재;이영도;정상진
    • Proceedings of the Korea Concrete Institute Conference
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    • 2002.05a
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    • pp.985-990
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    • 2002
  • Contemporary architecture calls for a wide range of surface textures and treatments. A surface compatible with the architect's design may vary from a glass-smooth finish to one requiring special sculptured ornamentation. These surfaces require many different types of form sheathing and lining. The purpose of study development new design form and made elaborateness shape. Easy to used in field that architecture finish material not used expect effective reduce of working hours, personnel expenses, architecture finish material, cost. After this, building wall apply a variety shape in concrete surface.

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Streaming Electrification of Pressbord by Oil Path Form (유로형상에 의한 절연지의 유동대전 특성)

  • 이동훈;최창락;박재윤;이충식;고희석;이덕출
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 1995.11a
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    • pp.332-335
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    • 1995
  • Electrification pipe modeled on the oil path of the high power transformer is designed and manufactured. Distributions of oil flow velocity are simulated as spacer form in the electrification pipe. Streaming currents are investigated as each electrification pipe. The surface oil velocity of spacer is small the streaming current.

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A Study on Building Wall with Glossing Design-Concrete (건축벽체용 광택문양콘크리트의 성능평가 연구)

  • 김종원;김재은;윤상혁;양동일;조상영;정상진
    • Proceedings of the Korea Concrete Institute Conference
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    • 2003.05a
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    • pp.573-578
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    • 2003
  • Contemporary architecture calls for a wide range of surface textures and treatments. A surface compatible with the architect's design may vary from a glass-smooth finish to one requiring special sculptured ornamentation. These surfaces require many different types of form sheathing and lining. The purpose of study development new design form and made elaborateness shape. Easy to used in field that architecture finish material not used expect effective reduce of working hours, personnel expenses, architecture finish material, cost. After this, building wall apply a variety shape in concrete surface

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A Study on the Performance Evaluation of Synthetic Resin Formwork Material (합성수지 거푸집 재료성능 검증에 관한 연구)

  • Nam, Kyung-Yong;Kim, Seong-Deok;Choi, Suk;Lee, Young-Do
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2019.05a
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    • pp.151-152
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    • 2019
  • This study length variation test, shock test were conducted to evaluate the performance of synthetic resin form. Results of both thermal length variation test and shock test satisfied the KS standards. for length variation test, the result of the horizontal and vertical valuse were -0.1% in average.

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