• Title, Summary, Keyword: 프리캐스트 콘크리트 세그먼트 라이닝

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Fire Resistance Performance of Precast Segmental Concrete Lining for Shield Tunnel (쉴드 터널용 프리캐스트 세그먼트 콘크리트 라이닝의 내화성능)

  • Han, Byung-Chan;Harada, kazunori;Kwon, Young-Jin;Kim, Yun Yong
    • Journal of The Korean Society of Civil Engineers
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    • v.34 no.1
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    • pp.95-105
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    • 2014
  • Reinforced concrete (RC) shield tunnel lining must be designed for fireproof performance because the lining is sometimes exposed to very high temperature due to traffic accidents. Both experimental and numerical studies are carried out to evaluate fire resistance performance of precast RC tunnel lining systems. In the experimental studies, six full-scale precast RC tunnel segments are exposed to fire in order to examine the influence of various parameters on the fire resistance performance of precast RC tunnel lining. We used the temperature curve of the RABT criteria, which are severe conditions of fire temperatures. The fire test showed that the explosive spalling was not observed by substituting concrete to PP fiber reinforced concrete. A transient heat flow analysis was carried out in consideration of the material properties that change with temperature, and the results showed good agreement with the test results.

Structural performance evaluation of precast concrete segment using synthetic fibres (프리캐스트 콘크리트 세그먼트의 합성섬유 보강재 적용에 따른 구조적 성능 평가)

  • Lee, Hoseong;Kim, Changyong;Lee, Sean S.;Kim, Seungjun;Lee, Kyeongjin
    • Journal of Korean Tunnelling and Underground Space Association
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    • v.20 no.2
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    • pp.469-483
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    • 2018
  • Steel bars have been widely used as the primary reinforcement for Precast Segmental Concrete Lining for TBM Tunnels. Previously, studies have been carried out to gauge the potential for steel fiber reinforcement to replace the use of steel bar reinforcements in the segmental lining to reduce the amount of the steel bar reinforcement. Steel fiber reinforcements have been investigated and widely applied to SFRC TBM linings to improve the constructability of SFRC TBM linings worldwide. However, the steel fiber reinforcement often caused punctures to the water membranes inside tunnel lining and had long-term durability deterioration issues caused by steel corrosion, as well as cosmetic problems. Therefore, this paper sought to gauge the potential of synthetic fiber reinforcements, which have proven to be very attractive substitutes for steel fiber reinforcements. This study analyzed the performance of both steel and synthetic fiber reinforcements in segmental linings and evaluated the applicability of the fiber reinforcements to the TBM Precast Concrete Segmental Linings of TBM tunnels. As a conclusion, this study demonstrates that the potential use of steel and synthetic fibers in various combination, can substitute the rebar reinforcement in the concrete mix for segmental concrete linings.

A Experimental Study on the Flexural Behavior of Bundle Type Polyamide Fiber Reinforced Concrete (다발형 폴리아미드섬유 보강 콘크리트의 휨거동에 관한 실험적 연구)

  • Jeon, Chan Ki;Jeon, Joong Kyu
    • Journal of the Society of Disaster Information
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    • v.10 no.1
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    • pp.61-70
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    • 2014
  • Synthetic fiber reinforced concrete is applicable to many applications for construction material. In general, synthetic fibers have low tensile strength and elastic modulus, but they have many advantages such as high crack resistance, impact resistance, chemical resistance, flexural behavior and corrosion free in fiber reinforced concrete. Recently, fiber reinforced concrete with macro synthetic fibers has been used to improve performance of structures in tunnel shotcrete, precast segmental lining and bridge slab and precast concrete structures. This study investigated the influence of bundled type polyamide fiber reinforced concrete on the flexural behavior in accordance with ASTM C 1609 and KS F 2566 standards.