• Title, Summary, Keyword: 내화대책

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New Fire Resistant Method of Reinforced Tunnel Structures Using Engineered Cementitious Composites (터널구조물의 내화대책에 대한 ECC 적용 가능성)

  • Kim, Jung-Hee;Kwon, Young-Jin;Lee, Hye-Kyung;Kim, Jae-Jwan;Han, Byung-Chan
    • Proceedings of the Korea Institute of Fire Science and Engineering Conference
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    • pp.441-448
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    • 2009
  • 화재에 대한 안전성 확보는 ECC 등과 같은 신소재를 실제 구조물에 적용 또는 실용화하기 위해 필요한 중요한 요소 중 하나이다. 본 논문은 터널구조물에 대한 내화대책의 일환으로써 ECC의 적용가능성을 평가하고자 하는 것을 목적으로 한다. 이를 위하여 터널구조물의 화재 온도조건인 RABT 화재온도이력곡선을 적용하여 내화성능을 실험적으로 평가하였다. 또한 비정상 온도분포해석 기법을 이용하여 이를 해석적으로 묘사 검증하였으며, 실험결과를 통해 검증된 해석기법을 이용하여 터널라이닝에 대한 열전달 해석을 수행하여 ECC의 적용가능성을 고찰하였다. 실험결과 ECC는 폭렬 및 화재상태에서의 모체콘크리트에 열화가 발생하지 않았으며, 기존 콘크리트 및 내화소재와의 상대 비교에 있어서도 가장 우수한 내화성능을 나타냈다. 이를 통하여 터널구조물의 내화대책에 있어 ECC 소재가 적용가능성이 있는 것으로 판단되었다.

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Experimental evaluation of fire protection measures for the segment joint of an immersed tunnel (침매터널 세그먼트조인트의 내화 대책에 대한 실험적 평가)

  • Choi, Soon-Wook;Chang, Soo-Ho;Kim, Heung-Youl;Jo, Bong-Hyun
    • Journal of Korean Tunnelling and Underground Space Association
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    • v.13 no.3
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    • pp.177-197
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    • 2011
  • In this study, a series of fire experiments under $HC_{inc}$ and ISO834 (duration of 4 hour) fire scenarios were carried out for three different types of fire protection measures for the segment joint to evaluate their applicabilities to an immersed tunnel. The experimental results revealed that an expansion joint installed to allow relative movements between concrete element ends in an segment joint is the most vulnerable to a severe fire. For the fire protection measure where the originally designed steel plates at an expansion joint arc replaced by fire-resistant boards, the experiments showed that they cannot achieve good fireproofing performance under both $HC_{inc}$ fire scenario and ISO834 (4 hour) fire scenarios since the installation of fire-resistant boards results in the reduction of the sprayed fire insulation thickness. On the other hand, the application of modified bent steel plates replacing the original steel plates was proved to be very successful in fireproofing of the expansion joint due to more sprayed materials filled in bent steel plate than in the original design concept as well as higher adhesion between the steel plate and the sprayed fire insulation layer.

A study on the fire resistance method using FR-ECC in long tunnel (고인성내화모르터(FR-ECC)를 사용한 장대터널 내화안전대책에 관한 연구)

  • Kim, Se-Jong;Kim, Dong-Jun;Kwon, Young-Jin
    • Journal of Korean Tunnelling and Underground Space Association
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    • v.13 no.1
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    • pp.9-18
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    • 2011
  • The spalling phenomenon occurs in high-strength concrete when several factors such as sharp temperature increase, high water content, low water/cement ratio and local stress concentration in material combine in the concrete material. On the basis of the factors, the preventing methods from the spalling are known as reduction of temperature increase, preventing of concrete fragmentation and fast drying of internal moisture. In this study, the reduction of temperature increase was proposed as the most effective spalling-preventing method among the spalling-preventing methods. Engineered cementitious composite for fireproof and repair materials was developed in order to protect the new and existing RC structures form exterior deterioration factors such as fire, cloride ion, etc. This study was carried out to estimate the fire-resisting performance of high strength concrete slab or tunnel lining by repaired engineered cementitious composite (ECC) or fiber reinforcement cemetitious composite (FRCC) under fire temperature curve. and them we will descrike the result of HIDA tunnel in Japan.

Development of Light-weight Fire Protection Materials Using Fly Ash and Light-weight Aggregate (플라이애시 및 경량골재를 활용한 경량 내화성 마감재료 개발)

  • Song, Hun;Chu, Yong-Sik;Lee, Jong-Kyu;Lee, Sea-Hyun
    • Journal of the Korean Recycled Construction Resources Institute
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    • v.6 no.4
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    • pp.95-102
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    • 2012
  • The serious issue of tall building is to ensure the fire resistance of high strength concrete. Therefore, Solving methods are required to control the explosive spalling. The fire resistant finishing method is installed by applying a fire resistant material as a light-weight material to structural steel and concrete surface. This method can reduce the temperature increase of the reinforcement embedded in structural steel and concrete at high temperature due to the installation thickness control. This study is interested in identifying the effectiveness of light-weight fire protection material compounds including the inorganic admixture such as fly ash, meta-kaolin and light-weight aggregate as the fire resistant finishing materials through the analysis of fire resistance and components properties at high temperature. Also, this paper is concerned with change in microstructure and dehydration of the light-weight fire protection materials at high temperatures. The testing methods of fire protection materials in high temperature properties are make use of SEM and XRD. The study results show that the light-weight fire resistant finishing material composed of fly ash, meta-kaolin and light-weight aggregate has the thermal stability of the slight decrease of compressive strength at high temperature. These thermal stability is caused by the ceramic binding capacity induced by alkali activation reaction by the reason of the thermal analysis result not showing the decomposition of calcium hydrate. Developed light-weight fire protection materials showed good stability in high Temperatures. Thus, the results indicate that it is possible to fireproof panels, fire protection of materials.

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Fireproofing Method for High Strength Concrete using Densified Spray Resistive Materials and Gypsum Board (고밀도 내화뿜칠재와 석고보드를 이용한 고강도 콘크리트 내화공법)

  • Song, Young-Chan;Kim, Yong-Ro;Oh, Jae-Keun;Kim, Ook-Jong
    • Proceedings of the Korea Concrete Institute Conference
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    • pp.471-472
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    • 2009
  • Recently, UH-PH SC (Ultra High PH Strength Concrete) used in High rise building is the material increases in tendency. Thus, the results indicate that it is possible to fireproof panels, fire protection of materials.

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Trends of Research and Practical Use on Explosive Spalling Properties and Performance Based of Structural Design of the High-Strength Concrete (고강도콘크리트의 폭렬대책공법에 대한 국내외 현황과 성능적 구조내화설계를 위한 과제)

  • Kwon, Young-Jin
    • Proceedings of the Korea Concrete Institute Conference
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    • pp.935-940
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    • 2008
  • When reinforced concrete is subjected to high temperature as in fire, there is deterioration in its properties of particular importance are loss in compressive strength, cracking and spalling of concrete, destruction of the bond between the cement paste and the aggregates and the gradual deterioration of the hardend cement paste. Assessment of fire-damaged concrete usually starts with visual observation of color change, cracking and spalling of the surface. In this paper, it was reported the trends of research and practical use on the Explosive Spalling Properties and Performance Based of Structural Design of the High-Strength Concrete.

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A Study on the Development Composite Fireproof Board Type for Fire Resistance Improvement of High Strength Concrete One Side Simplicity Heating Furnace Type - One Side Simplicity Heating Furnace Type - (고강도 콘크리트의 내화성능향상을 위한 합성내화보드 개발에 관한 연구 - 1 면 간이가열로 방식 -)

  • Shin, Jae-Kyung;Choi, Jin-Man;Lee, Sung-Chan;Moon, Hyung-Jae;Kim, Jeong-Jin;Park, Soon-Jeon
    • Proceedings of the Korea Concrete Institute Conference
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    • pp.233-234
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    • 2009
  • This study investigates the possibility of development of composite fireproof board type that is to improve the resistance of fireproof material and the problem of a conventional fire proof covering methods to prevent spalling failure of high strength concrete members.

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