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해머형 비파괴시험장비를 이용한 콘크리트의 압축강도평가에 관한 연구
김호 ( Kim Ho ),김규용 ( Kim Guy-yong ),황의철 ( Hwang Eui-chul ),손민재 ( Son Min-jae ),백재욱 ( Baek Jae-wook ),남정수 ( Nam Jeong-soo ) 한국건축시공학회 2018 한국건축시공학회 학술발표대회 논문집 Vol.18 No.2
As a result of this study, it was possible to derive the compressive strength curves of ordinary to ultra high strength concrete using the hammer type non - destructive testing equipment. In order to obtain reliable results, it is necessary to construct additional data. In addition, if reliability is ensured through construction site evaluation, it is considered that the application is possible on construction site.
황의철 ( Hwang Eui-chul ),김규용 ( Kim Guy-yong ),손민재 ( Son Min-jae ),서동균 ( Suh Dong-kyun ),이예찬 ( Lee Yae-chan ),남정수 ( Nam Jeong-soo ) 한국건축시공학회 2021 한국건축시공학회 학술발표대회 논문집 Vol.21 No.1
This study evaluated the vapor pressure and thermal stress of high-strength concrete according to spalling type. As a result, it was confirmed that the internal temperature gradient of the concrete varies depending on the heating rate, and the vapor pressure and thermal stress of the concrete are the main factors of spalling. In addition, it was confirmed that spalling type varies depending on the vapor pressure and thermal stress of the 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.
기건양생에 따른 고강도 콘크리트의 크리프 평가 및 모델 검토
황의철 ( Hwang Eui-chul ),김규용 ( Kim Guy-yong ),손민재 ( Son Min-jae ),서동균 ( Suh Dong-kyun ),이예찬 ( Lee Yae-chan ),남정수 ( Nam Jeong-soo ) 한국건축시공학회 2020 한국건축시공학회 학술발표대회 논문집 Vol.20 No.1
In this study, creep deformation characteristics of high strength concrete under dry curing conditions were investigated. It was confirmed that the creep coefficient decreases as the compressive strength of concrete increases. In addition, a modified proposal for calculating the ultimate creep factor of the ACI 209 model can be derived using the measured values.
황의철 ( Hwang¸ Eui-chul ),김규용 ( Kim¸ Guy-yong ),손민재 ( Son¸ Min-jae ),편수정 ( Pyeon¸ Su-jeong ),( Sasui¸ Sasui ),남정수 ( Nam¸ Jeong-soo ) 한국건축시공학회 2021 한국건축시공학회 학술발표대회 논문집 Vol.21 No.2
In this study, the deterioration of concrete subjected to high temperature was evaluated using harmonics. When concrete is exposed to high temperatures, its mechanical properties deteriorate. In order to evaluate this deterioration, a method of analyzing the waveform of elastic waves was applied. As the heating temperature increased, the fundamental wave of the 50 kHz elastic wave passing through the concrete decreased. In addition, harmonics were generated at each temperature, and the higher the heating temperature, the greater the ratio of harmonics. The higher the compressive strength, the greater the amplitude of the fundamental wave, and this phenomenon is thought to be due to the internal structure 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.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.
혼화재를 혼입한 순환유리잔골재 모르타르의 역학적 특성과 ASR 거동
유하민 ( Eu Ha-min ),김규용 ( Kim Guy-yong ),박준영 ( Park Jun-young ),사수이 ( Sasui Sasui ),최병철 ( Choi Byung-cheol ),남정수 ( Nam Jeong-soo ) 한국건축시공학회 2023 한국건축시공학회 학술발표대회 논문집 Vol.23 No.1
In this study, the mechanical properties, alkali-silica reaction(ASR) expansion and residual mechanical properties after ASR of waste glass fine aggregate(GS) mortar according to mineral mixture were evaluated. As a result, it was found that the mineral mixture reduces the ASR expansion. However, mechanical properties and residual mechanical properties have decreased.
고온에 노출된 콘크리트를 투과한 100kHz 초음파의 고조파 평가
황의철 ( Hwang Eui-chul ),박기홍 ( Park Ki-hong ),편수정 ( Pyeon Su-jeong ),유하민 ( Eu Ha-min ),남정수 ( Nam Jeong-soo ),김규용 ( Kim Guy-yong ) 한국건축시공학회 2022 한국건축시공학회 학술발표대회 논문집 Vol.22 No.2
In this study, harmonics of 100 kHz ultrasonic pulse transmitted through concrete exposed to high temperature were evaluated. Concrete exposed to high temperatures deteriorates its mechanical properties. In ultrasonic pulse, the fundamental wave was attenuated by the deterioration of the concrete. In addition, it was possible to confirm the occurrence of harmonics. It is thought that the fundamental and harmonics of ultrasonic pulse greatly affected by the internal structure of concrete.