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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):265-274.
DOI: https://doi.org/10.9798/KOSHAM.2019.19.1.265    Published online February 28, 2019.
제강슬래그 및 강섬유 혼입 콘크리트의 자기센싱 특성평가
최의균1, 원천봉2, 이진영3, 윤영수4
1정회원, 고려대학교 건축사회환경공학부 석사과정
2정회원, 고려대학교 건축사회환경공학부 박사과정
3정회원, 맥길대학교 토목공학과 박사 후 연구원
4정회원, 고려대학교 건축사회환경공학부 교수
Self-sensing Properties of Concrete with Electric Arc Furnace Slag and Steel Fiber
Euikyun Choi1, Tianfeng Yuan2, Jinyoung Lee3, Youngsoo Yoon4
1Member, Master’s Course, Department of Civil, Environment and Architectural Engineering, Korea University
2Member, Ph.D Candidate, Department of Civil, Environment and Architectural Engineering, Korea University
3Member, Postdoctoral Researcher, Department of Civil Engineering and Applied Mechanics, McGill University
4Member, Professor, Department of Civil, Environment and Architectural Engineering, Korea University
Corresponding author:  Youngsoo Yoon, Tel: +82-2-3290-3320, Fax: +82-2-928-7656, 
Email: ysyoon@korea.ac.kr
Received: 23 November 2018   • Revised: 28 November 2018   • Accepted: 4 December 2018
Abstract
In this study, 20 wt.% electric arc furnace slag (EAS) and 0.75 vol.% hooked steel fiber (SF) were used to improve the electrical conductivity and investigate the self-sensing properties of concrete. In addition, electrical and material properties were evaluated. Test results showed that the setting time was delayed and strength properties were diminished compared with those of plain ordinary Portland cement (OPC) specimens when using EAS. However, the compressive strength was similar to that of OPC, and ductility was increased by adding SF. The electrical resistivity of concrete was considerably reduced when incorporating SF and EAS. In addition, the combined use of EAS and SF resulted in good self-sensing performance in terms of the fractional change in resistivity (FCR). Moreover, the FCR was slightly decreased when using EAS or SF. Finally, the linear relationships between the FCR and compressive strain were observed, and the EAS-SF combination resulted in the highest gauge factor at approximately 97.2 when compared to other specimens.
Key Words: Electric Arc Furnace Slag, Steel Fiber, Electrical Resistivity, Fractional Change in Resistivity, Self-sensing
요지
본 연구에서는 콘크리트의 전기전도성을 증진시키고, 하중변화에 따른 자기센싱 특성을 평가하고자 전도성 재료로써 20 wt.%의 제강슬래그(EAS), 0.75 vol.%의 후크형강섬유(SF)를 혼입하였으며 전기적 특성 및 재료특성을 평가하였다. 실험결과 제강슬래그 혼입 시 플레인 변수(OPC)에 비하여 응결이 지연되었으며, 낮은 강도특성을 보였다. 하지만 강섬유와 제강슬래그를 함께 혼입 시 플레인 변수(OPC)와 유사한 압축강도를 보였으며, 연성이 증대되었다. 비저항 특성 실험결과 제강슬래그와 강섬유를 혼입함으로써 OPC의 비저항이 감소하였으며, 하중변화에 따른 비저항 변화율(FCR)을 비교하였을 때 제강슬래그와 강섬유를 함께 혼입한 변수에서 가장 좋은 자기센싱 성능을 보였다. 제강슬래그 강섬유를 독립적으로 혼입한 변수에서는 이보다 낮은 비저항 변화율(FCR)을 보였다. 최종적으로 비저항 변화율(FCR)과 변형률 사이의 선형관계를 확인하였으며, 제강슬래그와 강섬유를 함께 혼입한 변수에서 97.2의 가장 높은 게이지 팩터(Gauge factor)를 나타냈다.
핵심용어: 제강슬래그, 강섬유, 비저항, 저항변화율, 자기센싱


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