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탄소중립 확보를 위한 친환경 동절기 대체 열원 성능 검증
조만기 ( Jo¸ Man-ki ),김상균 ( Kim¸ Sang-kyun ),홍성민 ( Hong¸ Seong-min ),박종훈 ( Park¸ Jong-hun ) 한국건축시공학회 2021 한국건축시공학회 학술발표대회 논문집 Vol.21 No.2
Recently, the need to strengthen the Air Environment Conservation Act and secure alternative heat sources during the winter by carbon neutrality policies has been raised. Accordingly, winter construction, which has safety and quality measures, is emerging as an essential factor. It is believed that eco-friendly tropical type electric hot air heaters will be able to solve most of the problems of winter construction at construction sites, especially prevention of suffocation and fire accidents. In addition, as a result of on-site performance verification, it has secured more than the same performance as the existing curing method, and the curing technology can create an eco-friendly and pleasant working environment while considering safety and construction.
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.
유지류를 중심으로 한 수축저감제 종류 변화가 고강도 콘크리트의 기초물성 및 자기수축에 미치는 영향
조만기(Jo, Man-Ki),한천구(Han, Cheon-Goo) 대한건축학회 2016 大韓建築學會論文集 : 構造系 Vol.32 No.10
In this research, the fundamental properties and autogenous shrinkage behaviors of high strength concrete of 0.30 water-to-binder ratio was evaluated depending on the various shrinkage compensating admixtures such as soybean oil (BO), wasted cooking oil (WO), and emulsified refined cooking oil (ERCO) comparing to commercial shrinkage reducing admixture (SR), and expanding admixture (EA). According to the experiment results, the workability of the concrete mixture showed decreased when it contained BO, and WO rather than Plain. In the case of ERCO, due to the water dispersing effect caused by emulsification, similar workability was obtained to Plain. For compressive strength, the concrete mixtures with BO, and WO decreased compressive strength rather than Plain concrete mixture, while the concrete mixture with ERCO showed decreased compressive strength at early age and recovered strength at later age. Regarding the autogenous shrinakge reducing performance, the oil-based admixtures of BO, WO, and ERCO showed better performance than SR and EA; it is considered that the saponification, the hydrolyzed reaction of fatty-acid from oils by calcium hydroxide, the hydration product of cement paste, contributes on filling the capillary pores of the concrete matrix, and thus it decreases the shrinkage. eventually, workability, strength, autogenous shrinkage reducing of 30~40 %, and economical aspects, it can be state that using ERCO may be an efficient solution for autogenous shrinkage of high strength concrete.
에너지 절감형 전기히터를 활용한 동절기 양생품질 관리방안
조만기 ( Jo Man-ki ),홍성민 ( Hong Sung-min ),박종훈 ( Park Jong-hun ),김진식 ( Kim Jin-sik ),이동현 ( Lee Dong-hyun ),조성준 ( Cho Seong-jun ) 한국건축시공학회 2020 한국건축시공학회 학술발표대회 논문집 Vol.20 No.2
In This study, we tried to review an efficient curing method in consideration of safety and constructability among the problems of winter construction. In other words, as a result of the mock-up test, the measured value of carbon monoxide was 0 ppm in the case of an electric hot air fan. Since there is no carbon monoxide, problems such as suffocation are expected to be solved. In terms of temperature characteristics, electric hot air fans exhibited high thermal efficiency performance with a slight difference in upper/lower temperatures compared to the existing ones. In the future, we plan to conduct thermal efficiency evaluation through actual site performance verification. We will propose an efficient curing method through applicability evaluation.