• Title, Summary, Keyword: 고인성내화모르터

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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.

An Experimental Study on the Durability and Load Carrying Capacity of RC Structure Repair System Using FR-ECC (고인성 내화보수모르터(FR-ECC)를 활용한 RC 구조물 보수공법의 내구성능 및 내하력에 관한 실험적 연구)

  • Kim, Jeong Hee;Lim, Seung Chan;Kim, Jae Hwan;Kwon, Yung Jin
    • Journal of the Korea institute for structural maintenance and inspection
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    • v.16 no.2
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    • pp.75-86
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    • 2012
  • This paper presents some research results on the shrinkage characteristics and frost resistance before and after cracking of FR-ECC(Fire Resistance-Engineered Cementitious Composite). Also, a waterstop performance and exfoliating resistance of multi-layer lining specimens using FR-ECC and flexural performance of beam member by repaired FR-ECC are estimated in this paper. Experimental results indicate that the plastic shrinkage crack and length change ratio of FR-ECC have been reduced as compared with that of the existing repair mortar, and that its crack resistance on the dry shrinkage is improved under the confining stress. As well as FR-ECC has been great in the frost resistance and its tensile properties under the cracked state have been not reduced by freezing and thawing reaction. In addition, beam member by repaired FR-ECC have been increased in the flexural properties such as initial crack moment, yeild moment, and its crack width has been controled in a stable by the frexural failure.