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J. Korean Soc. Hazard Mitig. > Volume 18(7); 2018 > Article
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Journal of the Korean Society of Hazard Mitigation 2018;18(7):227-232.
DOI: https://doi.org/10.9798/KOSHAM.2018.18.7.227    Published online December 31, 2018.
고온을 받은 고강도 콘크리트의 고온특성에 관한 시간-온도관계 분석
권기석1, 권오상2
1정회원, 한양대학교 건축시스템공학과 박사과정
2한국건설기술연구원 화재안전연구소 수석연구원
Time-temperature Analysis of High-strength Concrete Exposed to High Temperatures
Kiseok Kwon1, Ohsang Kweon2
1Member, Ph.D Candidate, Department of Architectural Engineering, Hanyang University
2Senior Researcher, Department of Fire Safety Research, Korea Institute of Civil engineering and building Technology
Corresponding author:  Kiseok Kwon, Tel: +82-31-369-0523, Fax: +82-31-369-0540, 
Email: kskwonn@hanyang.ac.kr
Received: 13 November 2018   • Revised: 15 November 2018   • Accepted: 21 November 2018
Abstract
After a building fire, damages suffered by the structure are evaluated to determine whether the building remains suitable for use. It is vital for fire damage evaluation to be performed quickly and precisely. In addition, it is necessary to thoroughly analyze concrete degradation, which is influenced by heating time and heating temperature. In this study, high-strength concrete was heated at 400, 500 and 600 °C for 30, 60, 90, and 120 minutes respectively, to analyze the high-temperature characteristics of high-strength concrete in relation to heating temperature and heating time. Results indicate that the residual cleavability tensile strength of the concrete decreased by 6% at 400 ~ 500 °C, and 46% at 500 ~ 600 °C. Moreover, microstructure analysis showed that the decomposition of calcium hydroxide at 600 oC increased rapidly from the 60-minute point.
Key Words: Concrete, High Temperature, Repair, Reinforcement, Fire Damage Assessment
요지
건축물에 화재가 발생하는 경우 구조체의 화재피해 정도를 조사하여 건축물의 재사용 여부를 결정하게 되는데, 화재피해 정도를 신속하고 정확하게 조사하는 것이 매우 중요하다. 또한, 고온에 의한 콘크리트의 열화는 가열온도와 가열시간의 영향을 받으며, 이에 대한 면밀한 분석이 요구된다. 본 연구에서는 고강도 콘크리트를 400, 500, 600 °C의 온도에 각각 30, 60, 90, 120분 가열하여 가열온도와 시간에 따른 고온특성 분석을 수행하였다. 그 결과, 잔존할렬인장강도는 400~500 °C에서 6%, 500~600 °C에서 46% 감소하는 것으로 나타났다. 한편, 미세성분 분석 결과 600 °C로 가열하는 경우 90분을 기점으로 수산화칼슘의 분해가 급격하게 증가하는 것으로 나타났다.
핵심용어: 콘크리트, 고온, 보수보강, 화재진단평가


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