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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.
200㎫급 초고강도 콘크리트의 자기수축 특성에 관한 실험적 연구
하정수(Ha Jung-Soo),백민수(Paik Min-Su),손유신(Sohn Yu-Shin),이승훈(Lee Seung-Hoon),이영도(Lee Young-Do),정상진(Jung Sang-Jin) 대한건축학회 2011 大韓建築學會論文集 : 構造系 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, 193.7㎫. So, it is the appropriate combination for the 200㎫ 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.
섬유보강 초고강도 콘크리트의 강도 및 자기수축 특성에 관한 실험적 연구
이혜진(Lee, Hye-Jin),하정수(Ha, Jung-Soo),백민수(Paik, Min-Su),이영도(Lee, Young-Do),정상진(Jung, Sang-Jin) 대한건축학회 2013 大韓建築學會論文集 : 構造系 Vol.29 No.9
Ultra high-performance concrete which has recently been studied was developed to complement the brittle behaviour and dynamic uppermost limit of high strength concrete. Fiber reinforced concrete which mixed steel fiber is receiving attention as an alternative about this and is being developed to complement the disadvantages of high strength concrete including lower toughness coefficients and crack resistance and spalling in fires. Review about fiber reinforced ultra high-strength concrete that this study tries to treat includes reduction of autogenous shrinkage generated by high cement content per unit volume of concrete, evaluation of compressive and tensile strength to lower internal and external spalling resistance and fragility factors of member of framework, and flow characteristics of concrete which doesn"t harden according to steel fiber amounts and used materials. As the result, the more fiber reinforcement increases, the more compression and tensile strength increase and deformation control of cement matrix and improvement of energy absorption ability showed the great effect in shrinkage reduction.