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J. Korean Soc. Hazard Mitig. > Volume 18(7); 2018 > Article
시설물방재
Journal of the Korean Society of Hazard Mitigation 2018;18(7):307-314.
DOI: https://doi.org/10.9798/KOSHAM.2018.18.7.307    Published online December 31, 2018.
고로슬래그 60%를 혼입한 고강도 콘크리트의 강도발현 특성 및 내구성 평가
원천봉1, 양준모2, 김기돈3, 윤영수4
1정회원, 고려대학교 건축사회환경공학부 박사과정
2정회원, 계명대학교 토목공학과 조교수
3고려대학교 초대형구조기술연구소 연구원
4정회원, 고려대학교 건축사회환경공학부 교수
Evaluating Strength Development and Durability of High-Strength Concrete with 60% of Ground-Granulated Blast Furnace Slag
Tianfeng Yuan1, Jun-Mo Yang2, Ki-Don Kim3, Young-Soo Yoon4
1Member, Ph.D Candidate, School of Environment and Architectural Engineering, Korea University
2Member, Assistant Professor, Department of Civil Engineering, Keimyung University
3Researcher, Research Institute for Mega Construction, Korea University
4Member, Professor, School of Environment and Architectural Engineering, Korea University
Corresponding author:  Young-Soo Yoon, Tel: +82-2-3290-3320, Fax: +82-2-928-7656, 
Email: ysyoon@korea.ac.kr
Received: 29 October 2018   • Revised: 31 October 2018   • Accepted: 12 November 2018
Abstract
This experimental study investigates material properties and durability of high-strength concrete (HSC) using ground-granulated blast-furnace slag (BS) and hooked steel fiber. The test results indicated that the compressive and flexural strengths of the BS-blended concretes are higher than those of ordinary Portland cement up to 28-day aging after steam curing. The porosity decreased with the usage of the BS, and thus, the matrix became dense. Therefore, the BS-blended HSC is highly impermeable to water, regardless of whether it undergoes cracking, and some negative effects on the resistance against freezing and thawing actions. In addition, it has low resistance to carbonation despite low amounts of calcium hydroxide. However, it was confirmed that used as structural materials can be resistant to carbonation in long-term durability.
Key Words: High-strength Concrete, Ground Granulated Blast Furnace Slag (BS), Strength Characteristic, Water Permeability, Durability
요지
본 연구에서는 고로슬래그 미분말과 후크형 강섬유를 사용한 고강도 콘크리트의 재료특성과 내구성을 평가하였다. 실험결과, 증기양생 후 고로슬래그 미분말을 혼입한 변수들(BS60, BS60-SF)은 재령 28일까지 OPC변수보다 상대적으로 우수한 압축 및 휨 인장강도 발현을 나타냈다. 고로슬래그 미분말의 혼입으로 공극율이 감소하고 매트릭스의 구조를 더 치밀하여 균열 유무에 관계없이 우수한 투수저항성을 나타내는 반면, 고로슬래그 미분말을 다량 혼입으로 인하여 상대적으로 동결융해 저항성능이 다소 감소한 거동을 나타냈다. 또한 수산화칼슘을 감소함으로써 OPC변수보다 상대적으로 중성화 저항성능이 감소하는 것을 나타냈으나, 실구조체에 적용할 경우 중성화에 대한 장기내구성능 확보가 가능함을 확인하였다.
핵심용어: 고강도 콘크리트, 고로슬래그 미분말, 강도특성, 투수성, 내구성


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