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수화발열량차 공법을 이용한 매트기초 매스콘크리트 균열저감 및 현장적용
조만기 ( Man Ki Jo ),김준호 ( Jun Ho Kim ),허영선 ( Young Sun Heo ),한민철 ( Min Cheol Han ),한천구 ( Cheon Goo Han ) 한국건축시공학회 2012 한국건축시공학회 학술발표대회 논문집 Vol.12 No.2
In this study, the field applicability on reducing the heat of hydration of mass concrete by using the hydration heat difference method is analyzed with the following summary. As a result of applying the hydration heat difference method by using low heating combination, the temperature difference between the central part and the surface part of mass material was reduced, and as a result of visual observation, there was no showing of cracks by the hydration heat on the upper surface part. Therefore, the cracking index of the field to apply this method was shown to be approximately 1.57 with very little crack occurrence probability of less than 3%.
국내 남부지역의 골재원 변화에 따른 보통콘크리트의 기초 및 강도특성
조만기 ( Man Ki Jo ),송원루 ( Yuan Lou Song ),박용준 ( Young Jun Park ),이홍규 ( Hong Kyu Lee ),한민철 ( Min Cheol Han ),한천구 ( Cheon Goo Han ) 한국건축시공학회 2015 한국건축시공학회 학술발표대회 논문집 Vol.15 No.2
When using non KS aggregate muck pile in general, compared to when using KS aggregate, when obtaining an identical slump a high unit quantity of water was confirmed, and when designing the concrete mix the compressive strength of concrete decreased due to an increase in W/B. Therefore because the use of non KS aggregate decreases the liquidity, strength and durability etc. qualities of concrete from an overall performance point of view, there is a need for the used of KS aggregate and when using aggregate that does not adhere to KS standards, it is determined there is a need for appropriate concrete mix design and care.
유화처리 정제식용유를 사용한 고성능 콘크리트의 자기수축 Mock-up 실험
조만기(Man-Ki Jo),한천구(Cheon-Goo Han) 한국건설순환자원학회 2016 한국건설순환자원학회 논문집 Vol.4 No.3
본 연구에서는 CFT에 사용하는 70 및 100MPa급 고강도 콘크리트의 ERCO 적용 유무에 따른 기초적 물성 및 강도특성을 분석하고, Mock-up 시험을 통해 자기수축 저감성능 및 활용성을 검토하고자 하였는데, 그 결과 굳지않은 콘크리트의 유동특성으로 ERCO를 사용함에 따라 슬럼프 플로는 약간 저하하는 경향을 나타내었으나, 슬럼프는 증가하였고, 재료분리 저항성(EIS)은 2.5이하로 양호하게 나타났다. 공기량의 경우는 모두 목표범위를 만족하는 것으로 나타났는데, 단위용적질량은 증가하였으며, 응결시간은 약간 지연되는 것으로 나타났다. 강도 특성의 경우 ERCO를 0.5% 사용함에 따라 호칭강도 별 모든 배합에서 ERCO 0%에 비해 약 5~10%정도의 높은 압축강도 발현율을 나타내었다. 자기수축 특성은 전반적으로 ERCO를 사용한 배합의 경우 사용하지 않은 배합에 비해 20~30%정도 높은 자기수축저감 성능을 나타내었는데, 이는 ERCO의 주성분인 지방산(C₃H5(OCOR)₃)이 콘크리트 경화체중 수화생성물인 수산화칼슘(Ca(OH)₂)에 가수분해 되어 지방산칼슘(2RCOOCa), 즉 비누입자를 생성시켜, 콘크리트 경화체 내부의 모세관 공극을 충전함으로써 자기수축이 저감된 것으로 분석된다. 종합적으로 ERCO를 사용한 70 및 100MPa 고성능 콘크리트는 유동성 및 강도를 충분히 확보하였고, 자기수축 저감에도 효과적인 것으로 나타나, 이를 CFT 실구조체에 타설하는 것으로 결정하였다. The aim of this research is analyzing the fundamental properties and autogenous shrinkage reducing performance of 70 and 100MPa grade high performance concrete including emusified refined cooking oil(ERCO) under the mock-up conditions. As a results of experiment, the mixture contained 0.5% of ERCO showed slightly decreased slump flow while the slump was increased and segregation resistance performance was improved as 2.5 of EIS. For air content, all mixtures satisfied target air content with increased unit weight and delayed setting time with ERCO addition. In the case of compressive strength, when ERCO was added 0.5%, the result of approximately 5 to 10% of increased compressive strength was observed. For the autogenous shrinkage, ERCO contributed on 20-30% of shrinkage reducing performance comparing to Plain mixture without ERCO. It is considered that capillary pore filling action of soap particles occurred by the reaction of ERCO in cement paste between fatty aicd and calcium hydroxide contributed the shrinkage reducing performance. Based on these mock-up test results, application of the high performance concrete mixture with ERCO on CFT actual structure was decided.
저발열 배합 및 수화발열량차 공법을 이용한 매스콘크리트의 온도제어 및 수화열해석
조만기 ( Man Ki Jo ),김민호 ( Min Ho Kim ),장덕배 ( Duk Bae Jang ),양성환 ( Seong Hwan Yang ),한민철 ( Min Cheol Han ),한천구 ( Cheon Goo Han ) 한국건축시공학회 2015 한국건축시공학회 학술발표대회 논문집 Vol.15 No.1
In this study, we test the 3 properties low hydrated heat as binder, and also utilized the hydrated heat disparity construction method to decrease the cracks of the mass concrete caused by hydrated heat. The result showed by using the two methods narrowly decreased the cracks. And we ensured that during the mass concrete pouring, the cracks caused by hydrated heat could be reduced by utilizing the new construction method.