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J. Korean Soc. Hazard Mitig. > Volume 19(1); 2019 > Article
시설물방재
Journal of the Korean Society of Hazard Mitigation 2019;19(1):275-287.
DOI: https://doi.org/10.9798/KOSHAM.2019.19.1.275    Published online February 28, 2019.
초고성능 콘크리트를 활용한 LNG 탱크의 안전성 및 내구성 향상
김순호1, 김민재2, 김재진3, 전부기4, 류두열5
1정회원, 한양대학교 건축공학부 석⋅박사통합과정
2정회원, 한양대학교 건축공학부 석⋅박사통합과정
3한양대학교 건축공학부 석사과정
4한양대학교 건축공학부 석사과정
5정회원, 한양대학교 건축공학부 조교수
Improvement of Safety and Durability of LNG Storage Tank Using Ultra-High-Performance Concrete
Soonho Kim1, Min-Jae Kim2, Jae-Jin Kim3, Booki Chun4, Doo-Yoel Yoo5
1Member, Graduate Student, Department of Architectural Engineering, Hanyang University
2Member, Graduate Student, Department of Architectural Engineering, Hanyang University
3Graduate Student, Department of Architectural Engineering, Hanyang University
4Graduate Student, Department of Architectural Engineering, Hanyang University
5Member, Assistant Professor, Department of Architectural Engineering, Hanyang University
Corresponding author:  Doo-Yoel Yoo, Tel: +82-2-2220-2373, Fax: +82-2-2220-1945, 
Email: dyyoo@hanynag.ac.kr
Received: 31 August 2018   • Revised: 27 October 2018   • Accepted: 27 November 2018
Abstract
This study investigated the feasibility of applying ultra-high-performance concrete (UHPC) on the outer containment of a liquefied natural gas storage tank to improve its safety and durability. For this purpose, normal concrete (NC) and UHPC with three different straight steel fiber specimens (i.e., S65, S97.5, and S100) were fabricated and tested under a four-point bending load at three different conditions (i.e., ambient, cryogenic-AC, and cryogenic-WC) before and after cryogenic exposure to evaluate the effect of cryogenic temperature. Microscopic observation and scanning electron microscopy-energy dispersive X-ray spectroscopy (SEM-EDX) analysis were performed to determine cracking and self-healing behavior. The test results indicated that UHPC provided better resistance to crack formation than NC at cryogenic temperature. Moreover, UHPC with the S65 fiber showed the best performance at cryogenic temperature in terms of flexural performance and self-healing capacity. The SEM-EDX analysis confirmed that, after 28 days of water curing, the crack-filling materials were calcium carbonate (CaCO3).
Key Words: Ultra-High-Performance Concrete, Cryogenic, Self-healing, Flexural Performance, LNG Containment
요지
본 연구에서는 LNG 저장탱크의 안전성 및 내구성을 향상시키기 위해 일반 콘크리트로 건설되는 외조에 초고성능 콘크리트(UHPC, Ultra-High-Performance Concrete)를 적용하기 위한 연구를 진행하였다. 이를 위해 일반 콘크리트와 초고성능 콘크리트를 제작하였으며, 초고성능 콘크리트의 강섬유 종류에 따른 차이를 평가하기 위해 세 종류의 일자형 강섬유(S65, S97.5, S100)를 사용하였다. 초저온 노출에 따른 균열거동 및 휨 성능, 자기치유 특성을 평가하기 위해 4점 휨 실험 및 광학현미경 관찰, SEM-EDX 분석을 실시하였다. 주된 결과로 초고성능 콘크리트의 초저온 노출에 따른 균열저항성능이 뛰어남을 확인하였으며, 초저온 노출로 인한 손상은 최대 28일의 수중양생을 통해 회복될 수 있음을 확인하였다. 또한 수중양생을 통한 자기치유 물질은 탄산칼슘(CaCO3) 임을 확인하였다.
핵심용어: 초고성능 콘크리트, 초저온, 자기치유, 휨 성능, LNG 저장탱크


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