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콘크리트 압축강도 측정법과 공시체 내 철근이 압축강도 측정에 미치는 실험적 연구
이원홍 ( Won-hong Lee ),최상기 ( Sang-gi Choi ),이승열 ( Seuong-yeol Lee ),안진희 ( Jin-hee Ahn ),강범주 ( Beom-ju Kang ) 한국구조물진단유지관리공학회 2021 한국구조물진단유지관리공학회 논문집 Vol.25 No.6
콘크리트 구조물의 안전성 검토에서 콘크리트 압축강도 측정은 매우 중요한 요소이다. 콘크리트 압축강도 측정법에는 파괴방법과 비파괴방법이 있다. 파괴방법은 일축압축파괴방법이 있으며, 비파괴방법에는 반발경도법과 탄성파 측정법이 있다. 본 연구에는 측정법의 종류와 콘크리트 내부의 철근영향에 따른 콘크리트의의 압축강도 영향을 분석하였다. 공시체의 종류와 상관없이 3가지 실험 방법 중 탄성파 측정법에 의한 평균 압축강도가 다른 방법에 의한 평균 압축강도보다 크게 나타났다. 공시체 종류가 같을 경우 탄성파 측정법이 다른 측정법들에 비해 측정값들의 표준편차가 작게 나타났으므로 탄성파 측정법이 다른 두 측정법에 비해 측정값의 변동이 크지 않음을 알 수 있다. 각 공시체별 실험 방법에 따른 평균압축강도를 압축파괴 실험법의 평균압축 강도를 기준으로 비교하면 탄성파 측정법, 압축파괴실험, 반발경도법 순으로 평균압축강도가 높게 측정되었다. 콘크리트의 압축강도 측정방법과 콘크리트 내부 철근 유무에 따라 콘크리트 압축강도 측정값이 상이하므로 추후 피복두께의 영향 등을 고려한 연구가 필요할 것이다 Measuring the compressive strength of concrete is a very important factor in the safety review of concrete structures. Concrete compressive strength measurement methods include destructive and non-destructive methods. The destructive method includes the uniaxial compression failure method, and the non-destructive method includes the rebound hardness method and the elastic wave measurement method. In this study, the type of measurement method and the effect of reinforcing bars inside the concrete were tested to examine the relationship between them. Regardless of the type of specimen, the average compressive strength by the elastic wave measurement method among the three experimental methods was greater than the average compressive strength by the other methods. When the specimen type is the same, the standard deviation of the measured values of the elastic wave measurement method is smaller than that of the other measurement methods, so it can be seen that the elastic wave measurement method does not show large variance in the measured values compared to the other two measurement methods. When the average compressive strength according to the test method for each specimen was compared with the average compressive strength of the compressive failure test method, the average compressive strength was measured to be high in the order of the elastic wave measurement method, the compression failure test, and the rebound hardness method. Since the measured values of the compressive strength of concrete are different depending on the method of measuring the compressive strength of concrete and the presence or absence of reinforcing bars inside the concrete, further research is required considering the effect of various concrete covers.
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건식 옹벽 블록의 시멘트 혼입량 감소를 위한 혼화제 개발
이원홍(Won-Hong Lee),오홍섭(Hong-Seob Oh),이승열(Seuong-Yeol Lee),강욱중(Wook-Jung Kang),정재홍(Jae-Hong Jung),장낙섭(Nag-Seop Jang) 한국산학기술학회 2024 한국산학기술학회논문지 Vol.25 No.1
The admixture was developed to improve short and long age strength of concrete by replacing ferronickel slag, solid waste produced in the industrial ferronickel alloys smelting process, with fine aggregate. It was mixed into concrete and the estimated strength was evaluated through compressive strength and rebound hardness tests of retaining wall blocks. The fine aggregate replacement rate of ferronickel slag was fixed at 52%, and tests were conducted on concrete with 5 ~ 15% reduction in cement compared to fine aggregate depending on the amount of admixture mixed. In concrete using the developed admixture, the amount of cement mixed was reduced, but the compressive strength at 7 days actually increased. Therefore, it was evaluated as suitable for developing early strength. The developed retaining wall block was designed with a mix design that reduced cement by 10% by fixing the fine aggregate replacement rate of ferronickel slag at 52% and mixing the developed admixture. The compressive strength of the retaining wall block through the dry process was evaluated through the rebound hardness test method, and it was confirmed that the compressive strength performance of the product could be maintained even if the amount of cement was reduced.
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