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J. Korean Soc. Hazard Mitig. > Volume 19(7); 2019 > Article
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Journal of the Korean Society of Hazard Mitigation 2019;19(7):331-337.
DOI: https://doi.org/10.9798/KOSHAM.2019.19.7.331    Published online December 31, 2019.
유도가열 기반 발열양생 콘크리트의 압축강도 특성
이진복1, 김경택2, 안치형3, 백제훈4, 신현오5
1정회원, 충남대학교 지역환경토목학과 학사과정
2정회원, 충남대학교 지역환경토목학과 학사과정
3한국기술교육대학교 전기전자통신공학부 조교수
4한국기술교육대학교 전기전자통신공학부 조교수
5정회원, 충남대학교 지역환경토목학과 조교수
Compressive Strength of Heat-Cured Concrete based on Induction Heating
Jinbok Lee1, Kyeongtack Kim2, Chi-Hyung Ahn3, Jeihoon Back4, Hyun-Oh Shin5
1Member, Undergraduate Student, Department of Agricultural and Rural Engineering, Chungnam National University
2Member, Undergraduate Student, Department of Agricultural and Rural Engineering, Chungnam National University
3Assistant Professor, School of Electrical, Electronics and Communication Engineering, Korea University of Technology and Education
4Assistant Professor, School of Electrical, Electronics and Communication Engineering, Korea University of Technology and Education
5Member, Assistant Professor, Department of Agricultural and Rural Engineering, Chungnam National University
Corresponding author:  Hyun-Oh Shin, Tel: +82-42-821-5798, Fax: +82-42-821-8877, 
Email: hyunoh.shin@cnu.ac.kr
Received: 31 October 2019   • Revised: 1 November 2019   • Accepted: 6 November 2019
Abstract
A heat curing method was developed for concrete by using induction heating, which is a non-contact technique that operates on the principle of electromagnetic induction. The aim was to protect the concrete from freezing and achieve appropriate rate of strength gain in cold weather. The effects of the types and thicknesses of metallic forms, temperature variation curves, and addition of steel fibers on the compressive strength of concrete were evaluated. Test results indicated that no strength gain occurred when the concrete was kept in a low-temperature chamber at 0 °C. The concrete specimens that were cured using induction heating exhibited a strength gain ratio (122%-188% of the concrete cured at ambient temperature) that was comparable to that of the concrete specimens cured in a high-temperature chamber.
Key Words: Induction Heat Curing, Form Type, Temperature Variation Curve, Steel Fiber
요지
본 연구에서는 동절기 콘크리트의 동해를 방지하고, 강도발현 성능을 확보하기 위해 전자기 유도에 의한 비접촉식 가열방식인 유도가열을 활용한 콘크리트 발열양생 기법을 개발하였다. 거푸집 종류 및 두께, 온도이력곡선의 형태, 강섬유 혼입률에 따른 발열양생 후 압축강도 특성을 평가하였다. 실험결과 0 ˚C 저온양생 콘크리트의 15시간 압축강도는 1 MPa 미만으로 강도발현이 전혀 진행되지 않아 동절기 발열양생의 필요성을 확인하였다. 유도가열에 의한 발열양생의 경우 고온가열양생과 비슷한 수준의 강도 발현율을 보였으며, 상온양생 대비 약 122-188%의 강도 발현율을 보이는 것으로 나타났다.
핵심용어: 유도가열 양생, 거푸집 종류, 온도이력곡선, 강섬유
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