Journal of the Architectural Institute of Korea (대한건축학회논문집)

Architectural Institute of Korea (대한건축학회)
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Prediction of form demolding strength of concrete mixed with non-sintered hwangto using ultrasonic pulse velocity method

초음파 속도법에 의한 비소성 황토를 혼합한 콘크리트의 거푸집 탈형강도 예측

  • Nam, Young-Jin (Department of Fire and Disaster Prevention, Semyung University) ;
  • Kim, Won-Chang (Department of Fire and Disaster Prevention, Semyung University) ;
  • Choi, Hyeong-Gil (School of Architecture, Kyungpook National University) ;
  • Lee, Tae-Gyu (Department of Fire and Disaster Prevention, Semyung University)
  • Received : 2024.04.11
  • Accepted : 2024.06.05
  • Published : 2024.06.30
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Abstract

This study presented a trend equation derived from regression analysis of compressive strength and ultrasonic velocity to predict the form demolding time for concrete mixed with Non-sintered Hwangto (NHT) at various replacement rates. The experimental results showed that compressive strength decreased as the NHT substitution ratio increased. Regarding ultrasonic speed, the speed difference widened as age increased until one day old but decreased when measured up to 28 days. Regression analysis revealed that plain concrete had a lower ultrasonic velocity than HC at the same compressive strength. Additionally, plain concrete reached the time for vertical, single-layer, and multi-layer horizontal form demolding faster than HC. An error test comparing the trend formula from this study with previous studies showed that this empirical formula had an average error value close to zero, indicating high reliability for predicting demolding time.

Keywords

Acknowledgement

이 연구는 2024년도 한국연구재단 ICT 초음파 분석기법을 활용한 철근콘크리트 구조물의 화재손상 정량화 평가 모델 개발 연구비 지원에 의한 결과의 일부임. 과제번호: 2022R1F1A1073333 이 연구는 2024년도 중소기업기술정보진흥원 하천/호수 수질 개선을 위한 녹색전환형 저탄소 결합재 기반 조립식 생태여울둑 실용화 기술 개발 연구비 지원에 의한 결과의 일부임. 과제번호: S3270705

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