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플라이애시를 다량 사용한 콘크리트의 강도특성에 관한 연구
백민수,이영도,정상진,Paik, Min-Su,Lee, Young-Do,Jung, Sang-Jin 한국건축시공학회 2002 한국건축시공학회지 Vol.2 No.4
To study of binder and fine aggregate a lot of replacement fly-ash concrete, initial characteristics, standard environment of curing temperature $20^{\circ}C$, hot-weather environment, cold weather environment of curing temperature $5^{\circ}C$. Flash concrete tested slump, air contest, setting and Hardening concrete valuated setting period of form, day of age 3, 7, 28 compression strength in sealing curing. Underwater curing specimen compression strength of age 3. 7, 28day used strength change accordingly fly-ash concrete curing temperature. Purpose of study is consultation materials in field that variety of fly-ash replacement concrete mix proportion comparison and valuation. (1) Setting test result, fly-ash ratio of replacement higher delay totting time. Same volume of fly-ash ratio of replacement is lower fly-ash ratio of replacement fine aggregate delay setting time. Setting test in curing temperature $35^{\circ}C$ over twice fast setting in curing temperature $20^{\circ}C$ and all specimen setting delay in curing temperature $5^{\circ}C$. F40 specimen end of setting about 30 time. (2) Experiment result age 28day compression strength more fisher plan concrete then standard environment in curing temperature $20^{\circ}C$, cold weather environment in curing temperature $5^{\circ}C$, most strength F43 is hot-weather environment in curing temperature $35^{\circ}C$ replacement binder 25%, fine aggregate 15%. (3) Hot-weather environment replacement a mount of fly-ash is a same of plan concrete setting period of form. Age 28day compression strength replacement a mount of fly-ash more hot-weather concrete then plan concrete.
플라이애시를 대량 사용한 콘크리트의 수화열특성 및 강도특성에 관한 연구
백민수,이영도,정상진,Paik, Min-Su,Lee, Young-Do,Jung, Sang-Jin 한국건축시공학회 2003 한국건축시공학회지 Vol.3 No.3
This study is for the great quantity use of fly-ash. For the producing of high volume concrete from the use of fly-ash, the method of replacement between bonding agents and fine aggregate by fly-ash was used at the same time. It was used that the adiabatic temperature rise of concrete about the mass member which had been produced by the method that was mentioned before, and the hydration heat of the core test pieces in concrete was measured. Also the core test pieces which were replaced with fly-ash was studied by the compressive strength's comparison between standard care test pieces and core test pieces. In the case of mass test pieces, hydration heat and the time to reach the highest temperature were decreased by an increase in replaced fly-ash's amounts of concrete. In addition, among the test pieces having the same amounts of concrete, the test pieces having more replaced amounts of fly-ash's fine aggregate showed higher hydration heat and the increased time to reach the highest temperature. Compressive strength was also increased by hydration heat's decrease according to fly-ash replacement. Replacement of fly-ash was more effective in high temperature environment.
플라이애시를 多量 置換한 콘크리트의 水和熱 및 强度特性에 關한 實驗的 硏究
백민수(Paik Min-Su),이영도(Lee Young-Do),정상진(Jung Sang-Jin) 대한건축학회 2003 大韓建築學會論文集 : 構造系 Vol.19 No.9
This study is for the great quantity use of fly-ash. For the producing of high volume concrete from the use of fly-ash, the method of replacement between bonding agents and fine aggregate by fly-ash was used at the same time.<br/> It was used that the adiabatic temperature rise of concrete about the mass member which had been produced by the method that was mentioned before, and the hydration heat of the core test pieces in concrete was measured. Also the core test pieces which were replaced with fly-ash was studied by the compressive strength's comparison between standard care test pieces and core test pieces.<br/> In the case of mass test pieces, hydration heat and the time to reach the highest temperature were decreased by an increase in replaced fly-ash's amounts of concrete. In addition, among the test pieces having the same amounts of concrete, the test pieces having more replaced amounts of fly-ash's fine aggregate showed higher hydration heat and the increased time to reach the highest temperature. Compressive strength was also increased by hydration heat's decrease according to fly-ash replacement. Replacement of fly-ash was more effective in high temperature environment.
200MPa급 초고강도 콘크리트의 자기수축 특성에 관한 실험적 연구
하정수,백민수,손유신,이승훈,이영도,정상진,Ha, Jung-Soo,Paik, Min-Su,Sohn, Yu-Shin,Lee, Seung-Hoon,Lee, Young-Do,Jung, Sang-Jin 대한건축학회 2011 대한건축학회논문집 Vol.27 No.8
Low W/B ultra-high strength concrete has low porosity and discontinuous capillary tube in the cement milk. Within a few days after placement, autogenous shrinkage occur because of the quick drying from the self-desiccation. So, the possibility of cracking is higher than the normal strength concrete. In this study, the autogenous shrinkage deformation characteristics of ultra-high strength concrete that are different from the normal strength concrete were examined. A new shrinkage formula is suggested form the experiment data. The conclusion is as follows. 1) The 91days strength of the concrete combination that are W/B 12.5%, normal portland cement 55%, china silica fume 20%, GGBFS-2 20%, anhydrite 5% was the best result, 193.7MPa. So, it is the appropriate combination for the 200MPa grade ultra-high strength concrete. 2) The autogenous shrinkage deformation of W/B 20% ultra-high strength concrete can be predicted using the suggested shrinkage formula.
마이크로파 가열기법에 의한 고강도콘크리트의 조기강도추정에 관한 실험적 연구
김민석(Kim Min-Suk),정근호(Jung Keun-Ho),백민수(Paik Min-Su),김성식(Kim Sung-Sik),정재욱(Jung Jae-Wook),정상진(Jung Sang-Jin) 대한건축학회 2003 大韓建築學會論文集 : 構造系 Vol.19 No.5
Compressive strength of concrete is considered it's most valuable property among the mechanical properties of concrete. but, If 28 days passes by, there is a quality badness in concrete. That concrete building is mandatory to repair, reinforce or remove after 28days. The early strength estimation method is required on the placing time. The new early strength estimation method solved that kinds of problems is Microwave use method. In this study, it is analyzed that factors and correlation of early strength estimation using high strength concrete. This experimental study gives the fundamental data which help a efficient quality control of real construction field. The result of this study is belows. (1) Both high strength concrete and normal, Strength develops in accelerating strength as W/C goes lower and as curing time is increase, the more accelerating strength develops. (2) In case of high strength concrete, the determination coefficient that between accelerated compressive strength and 28 days strength are 0.97 and the other case of normal, it that between accelerated compressive strength and 28 days strength is 0.94. (3) The determination coefficient that between accelerated compressive strength in the job mixing proportion that is applied to concrete experiment, 7 days strength and 28 days strength are 0.87, 0.92. Above result of the experiment shows that the strength estimation method with microwave can be appied to high strength concrete. It needs a many experiments to supplement correlations. The effort to reduce the deflection and increase the accelerating strength is required that have consideration to depend on.