• Title/Summary/Keyword: Surface Construction

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Mechanical and Fire Resistance Properties of Surface Preparation Mortar in Buildings Using Expanded Graphite (팽창흑연을 활용한 건축물 외단열 바탕조정재의 역학 및 연소 특성평가)

  • Ryu, Hwa-Sung;Shin, Sang-Heon;Song, Sung-Young;Kim, Deuak-Mo
    • Journal of the Korean Recycled Construction Resources Institute
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    • v.7 no.4
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    • pp.395-404
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    • 2019
  • In the case of fire, surface treatment agents used in external insulation finishing methods are substances that are vulnerable to fire due to thin finishes and the combustion of polymers. In this study, it was expected that the performance of surface preparation mortars could be improved by using expandable graphite with excellent thermal performance. Experimental results showed that the mechanical properties of surf ace preparation mortar were improved by using the fly ash and silica fume. Surface treatment materials using expanded graphite have a characteristic of expanding when a fire occurs. It has been shown that heat-swellable surface treatment materials can reduce the penetration of heat sources into the surface of synthetic insulation.

A Study on complex waterproofing Method Using Part of Joint Watertightness Improved Sheet (접합부 수밀성 향상 시트를 이용한 복합방수 공법에 관한 연구)

  • Suh Woo-Il;Kim Su-Ryon;Kwak Kyu-Sung;Oh Sang-Keun
    • Proceedings of the Korean Institute of Building Construction Conference
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    • v.y2004m10
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    • pp.1-6
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    • 2004
  • We ensure a flat and regular basic surface by using part of joint waterproofing improved sheet method applying the upper slab of a concrete structure. We solve the problem of getting loose scale the general sheet by waterproofing of the sheet and improving adhesive strength of the basic concrete. Also, waterproofing sheet union to problem of joint have solved using of insertion type method so that, it improved a watertightness. It has improved in resist impact, resist abrasion and it is the effect of shortened construction period and cutting down on construction expenses. Here are the special quality and superiority of this waterproofing research. (1) Level material has the super adhesive strength so that it makes the basic surface without the gab of waterproofing sheet and waterproofing layer with the string adhesive strength. (2) We unite the sheet with the joining part between sheets by waterproofing sheet joint using of method. (3) There is the effect of shortened construction period and cutting down on construction expenses without waterproofing of protection.

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Results Of Mathematical Modeling Of Organizational And Technological Solutions Of Effective Use Of Available Resource Of Modern Roofs

  • Arutiunian, Iryna;Mishuk, Katerina;Dankevych, Natalia;Yukhymenko, Artem;Anin, Victor;Poltavets, Maryna;Sharapova, Tetiana
    • International Journal of Computer Science & Network Security
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    • v.21 no.1
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    • pp.49-54
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    • 2021
  • Relative to the outer surface of the mastic coating, the reliability of the available waterproofing resource is determined by the ability to stabilize the structural characteristics in difficult climatic conditions. Organic components of mastic as a result of solar radiation, elevated temperatures and their alternating change, atmospheric oxidants, especially in industrial areas, have a tendency to self-polymerization and loss of low molecular weight components. This is the gradual loss of deformability and the transition to brittleness with its tendency to crack as the reasons for the gradual transition from normal to emergency operating condition.The presented mechanism of functioning of the coating surface indicates the expediency of increasing its components, able to stabilize the structure and prevent changes in deformability.Durability, hydrophobicity, water displacement, water absorption are accepted as estimating indicators. The main dependences of the influence of the lost additional components of mastic on the operational properties of the formed coating characterize the ability to provide successful resistance to environmental influences and longer stability. As a result, mastic acquires additional service life.

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.

A Study on the Surface Finish of Concrete Corresponding to Aluminum Form (알루미늄 거푸집을 이용한 모의구조체의 표면 마감성에 관한 연구)

  • Kim, Tae-Cheong;Lee, Dong-Gyu;Baek, Dae Hyun;Han, Min-Cheol;Han, Cheon-Goo
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2008.05a
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    • pp.47-50
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    • 2008
  • This study analyzed the effect of increasing the number of times using aluminum form to the surface quality of concrete through small sized test, and the result was summarized as following. At the early stage, there was no remarkable change between aluminum and coated plywood form, and the surface quality of concrete both forms slightly declined corresponding with increasing the number of times using.As void on the surface corresponding to the number of times, the voids ranged 0.1~1mm were increased corresponding to increasing the number of times using forms, and the other range voids were also increased according to increasing the number of times using forms. It was confirmed that the surface of concrete was damaged gradually. For comparison with aluminum and coated plywood form though this experimental results, there might be no difference, if release agent was used properly.

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SECOND CHERN NUMBERS OF VECTOR BUNDLES AND HIGHER ADELES

  • Osipov, Denis V.
    • Bulletin of the Korean Mathematical Society
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    • v.54 no.5
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    • pp.1699-1718
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    • 2017
  • We give a construction of the second Chern number of a vector bundle over a smooth projective surface by means of adelic transition matrices for the vector bundle. The construction does not use an algebraic K-theory and depends on the canonical ${\mathbb{Z}}-torsor$ of a locally linearly compact k-vector space. Analogs of certain auxiliary results for the case of an arithmetic surface are also discussed.

An Experimental Study for Basic Performance Evaluation According to the Glossing Surface Design Concrete (문양콘크리트의 광택화를 위한 기초적 성능평가에 관한 실험적 연구)

  • 김재은;김우상;조상영;김성식;임남기;정상진
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2004.05a
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    • pp.109-112
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    • 2004
  • Contemporary, architecture calls for a wide range of surface textures and treatments. A surface compatible with the architecture'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, through this study, we have figured out the best mix proportion for durability and glossability of glossing exposure concrete.

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Evaluation on Crack in Self-leveling Material and Investigation about Influence of Specimen Size - Evaluation Method about Surface Layer Quality of Concrete Floor Groundwork Corresponding to Defect in Self-leveling Material (Part I) - (콘크리트 바닥 시험체의 크기가 SL재의 균열에 미치는 영향 - SL재의 하자 발생에 영향을 미치는 콘크리트 표층부의 품질 평가방법(I) -)

  • Kim, Doo-Ho;Choi, Soo-Kyung
    • Journal of the Korea Institute of Building Construction
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    • v.7 no.2 s.24
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    • pp.99-106
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    • 2007
  • The purpose of this study presents in Relations between cracks in self-leveling material and quality of floor groundwork surface are experimentally examined. As the first stage, the experiment to observe cracks in self-leveling material constructed on floor groundwork made from various kinds of concrete was carried. As a result, following basic findings were obtained. First, observation of cracks should be continued until an increase in width of cracks stop, without constructing any finishing material. Second, degree of cracks may be indicated quantitatively by the product of length and width. Finally, Cracks and separation is not be influenced by specimen size. Based on these findings, the method of predicting cracks by evaluating surface layer quality of floor groundwork will be established.

Development and Performance Evaluation of Floor Level Joint System (다목적 바닥 레벨조인트 공법의 개발 및 성능평가에 관한 연구)

  • 최윤철;서수연;지남용;이리형
    • Proceedings of the Korea Concrete Institute Conference
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    • 2002.05a
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    • pp.953-958
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    • 2002
  • The finishing method of concrete floor using automatic surface finisher is one of new technologies in concrete floor construction. The development of high technologies in construction will increase in order to satisfy the demand to construct high quality building. Using this method, it is possible to increase the quality of building as well as to reduce the labor work in site. In this paper, a system which can be used to finish the concrete floor using automatic surface finisher, is presented and its structural capacities are evaluated. The system is composed of rail which guides the surface vibrator and absorbs the volume change of concrete, and a device supporting the rail. From the experimental work for these devices, it was shown that the support and rail had suitable strength to resist the automatic surface finisher. For design purpose, also, effective span of supports was tabulated.

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Improvement of Surface Glossing of Exposed Concrete Applying Flowing Concrete Method -Focused on the Construction of the Service Training Institure (유동화 공법에 의한 제치장 콘크리트의 표면광택도 향상 -청주대학교 대천 수련원 공사를 중심으로-)

  • Jeon, Chung-Keun;Kim, Hyo-Goo;Oh, Sun-Kyo;Bahn, Ho-Yong;Han, Cheon-Goo
    • Proceedings of the Korea Concrete Institute Conference
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    • 2000.04a
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    • pp.85-88
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    • 2000
  • This paper is dealt with the ways of the improvement of the surface glossing of exposed concrete through the construction field test. The field applied in this test is located at Daechon, Chungnam province where the service training institute of Chongju university has been built. The flowing method is applied. According to the test results, as water to cement ratio, or slump increase after flowed, surface glossing tends to be improved. As for the effects of the forms typer, following orders, which is shown to be better surface glossing values, are given; Acryle > fancy wood forms > steel forms > plywood forms.

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