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황의철 ( Hwang Eui-chul ),김규용 ( Kim Guy-yong ),이상규 ( Lee Sang-kyu ),손민재 ( Son Min-jae ),백재욱 ( Baek Jae-wook ),남정수 ( Nam Jeong-soo ) 한국건축시공학회 2018 한국건축시공학회 학술발표대회 논문집 Vol.18 No.1
In this study, the ultrasonic pulse velocity of the concrete cooled to room temperature after heating and the concrete during heating were evaluated. Also, the ultrasonic pulse velocity and mechanical properties of concrete were compared. As a result, the ultrasonic pulse velocity decreased when the concrete degraded during heating, and the ultrasonic pulse velocity of the cooled concrete decreased significantly. Which is consistent with the deterioration of mechanical properties of concrete.
황의철 ( Hwang Eui-chul ),김규용 ( Kim Guy-yong ),이상규 ( Lee Sang-kyu ),손민재 ( Son Min-jae ),백재욱 ( Baek Jae-wook ),남정수 ( Nam Jeong-soo ) 한국건축시공학회 2018 한국건축시공학회 학술발표대회 논문집 Vol.18 No.2
In this study, surface spalling and explosive spalling of ring-type ultra-high strength concrete under rapid heating and slow heating were investigated. In rapid heating, the internal temperature difference of the concrete is large, so that continuous surface spalling occurs. However, in slow heating, the difference in the internal temperature of the concrete is small, resulting in explosive spalling at a time. Since the heating condition has a great influence on the internal temperature of the concrete, it is necessary to consider the spalling of the concrete under various heating conditions.
고온에 노출된 링형 강관 구속 콘크리트의 폭렬 및 초음파투과시간
황의철 ( Hwang Eui-chul ),김규용 ( Kim Guy-yong ),이상규 ( Lee Sang-kyu ),손민재 ( Son Min-jae ),편수정 ( Pyeon Su-jeong ),남정수 ( Nam Jeong-soo ) 한국건축시공학회 2019 한국건축시공학회 학술발표대회 논문집 Vol.19 No.1
In this study, the spalling and ultrasonic pulse transmission time of concrete were investigated according to compressive strength during heating. As a result, the higher the compressive strength of the concrete, the more the explosion occurs, which affects the cross-sectional loss and the spalling fragment size. Also, ultrasonic pulse transmission time was found to be strongly influenced by the section loss of concrete.