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스트론튬계 잠열재를 사용한 저발열 콘크리트의 현장적용 평가
길배수,윤현도,정옥란 한국구조물진단유지관리공학회 2011 한국구조물진단유지관리공학회 논문집 Vol.15 No.5
본 연구에서는 스트론튬계 잠열재를 사용한 저발열 콘크리트를 레미콘 배처플랜트에서 시험생산한 후 생산된 콘크리트의 기초성능 및 모의부재에 의한 수화온도 특성을 평가하였으며, 그 결과 스트론튬계 잠열재를 사용한 저발열 콘크리트의 현장적용 가능성을 확인하였다. 이후 스트론튬계 잠열재를 사용한 콘크리트를 실제 교각 건설현장에 적용하였으며, 적용부재에 대한 수화열 해석 및 타설 콘크리트의 성능평가 결과 수화열 및 온도균열 저감효과가 우수한 것으로 나타나, 향후 대형 매스콘크리트의 수화열 및 온도균열 저감대책으로서 활용이 기대된다. Low heat concrete using strontium hydroxide based latent heat material was manufactured in ready-mixed concrete batcher plant and its fundamental properties were tested. As a result of B/P test, its applicability to the construction site was verified. After B/P test, low heat concrete using strontium hydroxide based latent heat material was applied to the real construction site of bridge footing. Through the analysis and the actual measurement of the hydration heat of the concrete footing, the reduction effect of hydration heat and thermal crack was confirmed.
길배수,남재현 대전대학교 산업기술연구소 1998 산업기술연구소 論文集 Vol.9 No.2
The aim of this study is to compare the development of compressive strength of high-flowing concrete with maturity and to investigate the applicability of strength prediction models of concrete. An experiment was attempted on the high-flowing concrete mixes using ordinary portland cement, ordinary portland cement replaced by fly-ash 30% by cement weight, high belite cement and blast furnace slag cement, the water-binder ratios of mixes being 0.35 and the curing temperatures being 5, 10, 20, 30℃. Test results of mixes are statistically analyzed to infer the correlation coefficient between the maturity and the compressive strength of high-flowing concrete.
플라이애쉬를 혼입한 현장타설 매스콘크리트의 압축강도 추정에 관한 실험적 연구
길배수,채영석,남재현,Khil, Bae-Su,Chae, Young-Suk,Nam, Jae-Hyun 한국구조물진단유지관리공학회 1999 한국구조물진단유지관리공학회 논문집 Vol.3 No.1
The object of this study is to compare properties of massive fly-ash concrete with plain concrete. Two concrete mixtures comprising two batch each $1.0m^3$ in volume, were made from ready mixed concrete batch plant. The water-to-cementitious materials ratio was kept constant at 51.4%. Therefore, massive concrete specimen($W800{\times}D800{\times}H800mm$) was cast from ready mixed concrete to analyze history of temperature and core strength properties. Bleeding, time of slump loss and time of setting of the fresh concrete were measured. In order to estimate the properties of massive fly-ash concrete in hardened concrete, non-destructive tests such as rebound hardness, ultrasonic pulse velocity and maturity were performed and analyzed.
적산온도에 의한 콘크리트 압축강도 추정모델의 적용성 검토
길배수 ( Khil¸ Bae-su ),권영진 ( Kwon¸ Young-jin ),남재현 ( Nam¸ Jae-hyun ),김무한 ( Kim¸ Moo-han ) 한국구조물진단유지관리공학회 1999 한국구조물진단유지관리공학회 논문집 Vol.3 No.2
The major object of this study is to investigate experimentally the experimental equation by the non-destructive testing methods of ultrasonic pulse velocity, rebound number, combined method of ultrasonic pulse velocity and rebound number, maturity which are applicable to the evaluation of compressive strength of concrete at early ages. Also test result of mix are statistically analyzed to infer the correlation coefficient between the maturity and the compressive strength of concrete. The results show good application of Logistic curve for estimating strength development under various curing temperature. The relation between ultrasonic pulse velocity, rebound number, combined method of ultrasonic pulse velocity and rebound number and compressive strength of concrete have low correlation coefficient, but maturity method show good correlation coefficient.
길배수,남재현 大田大學校 産業技術硏究所 1998 산업기술연구소 論文集 Vol.9 No.1
The aim of this study is to compare the development of compressive strength of concrete with maturity and to investigate the applicability of the compressive strength prediction model of moderate strength concrete. An experiment was attempted as study on the strength of concrete produced made with ordinary portland cement under the various mixing proportions such as water-cement ratio of 0.4, 0.5, 0.6, 0.7 and curing temperature of 30, 20, 10, 5℃. Test results of mixes are statistically analyzed to infer the correlation coefficient between the maturity and the compressive strength of moderate strength concrete. Key-words : maturity, strength prediction model.