초음파속도법(UPV)을 이용한 고온 노출 콘크리트 강도 추정 연구


Strength estimation of concrete exposed to high temperatures using UPV method

지희근, 김기동, 최동규, 김일헌, 최열

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There are various tests for measuring the strength of concrete structures affected by fire. Actually, one of the most reliable tests is a destructive test using the drilled concrete core samples after fire. The non-destructive testing methods (NDT) such as ultrasonic pulse velocity (UPV) method also may be apply to estimate the concrete strength, especially when there are problems related to obtaining core samples. This paper describes the strength estimation of concrete subjected to high temperatures using UPV (ultrasonic pulse velocity) method. Cylindrical concrete specimens of 18MPa, 24MPa, 27MPa and 35MPa were exposed to 2000C, 4000C, 6000C and 8000C, respectively. Compressive and splitting tensile strengths after exposure to high temperature were investigated using destructive test and non-destructive test (UPV method). Test results indicated that the obtained decreasing rates of concrete strength up to exposure of 8000C by destructive test are very similar to decreasing rates of UPV values. It can be concluded that the UPV method, non-destructive test, can be used to estimate strength of concrete subjected to high temperatures without damage of concrete structural members due to fire damaged core samples.


1. 서론
2. 실험계획 및 실험
2.1 공시체 및 배합비
2.2 고온 노출
2.3 초음파 속도법 (UPV method)
2.4 강도 시험
3. 실험결과 분석
3.1 상온에서의 압축강도 및 인장강도
3.2 고온에서의 압축강도 및 인장강도
3.3 고온하의 초음파 (UPV)값의 변화
3.4 콘크리트 강도와 UPV 값의 관계
4. 결론


  • 지희근 Ji, Heegeun. 경북대 대학원 석사과정
  • 김기동 Kim, Gidong. 경북대 대학원 석사과정
  • 최동규 Choi, Dongkyu. 경북대 대학원 석사과정
  • 김일헌 Kim, Ilheon. 경북대 대학원 박사과정
  • 최열 Choi, Yeol. 경북대 건축학부 교수, 공학박사


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