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폐유지류가 혼화재 다량 치환 콘크리트의 내구성에 미치는 영향
한민철,우대훈,Han, Min-Cheol,Woo, Dae-Hoon 한국건설순환자원학회 2013 한국건설순환자원학회 논문집 Vol.1 No.3
본 연구에서는 폐유지류가 혼화재 다량 치환콘크리트의 내구성에 미치는 영향을 실험적으로 고찰하고자 한다. 플라이애시 30% 및 고로슬래그 60% 치환한 콘크리트를 대상으로 기초적 물성과, 탄산화저항성, 동결융해저항성, 염해 저항성 및 황산염 침투저항성을 고찰하고 세공구조를 측정하였다. 본 연구에 사용된 폐유지류는 유동성 저하를 방지하기 위하여 유화처리된 폐유지류(ERCO)를 사용하였고, 혼입률은 1.0%까지로 결정하였다. 연구결과에 따르면, 슬럼프 및 공기량은 ERCO 혼입에 따라 감소하는 경향을 보였고, 압축강도는 ERCO혼입에 따라 28일강도는 다소 저하하나 180일 강도의 경우 ERCO혼입과 동등이상의 값을 보였다. 또한, ERCO 혼입에 따른 내염해, 탄산화, 황산염 및 동결융해 저항성에 대하여 분석한 결과로는 염화물 침투저항성 및 탄산화 침투 저항성은 ERCO 혼입률 증가에 따라 저항성이 향상되나, 동결융해 저항성은 저하되는 것으로 나타났다. This paper is to investigate an effect of waste cooking oil(WCO) on the engineering properties and durability of high volume admixture concrete. Fly ash with 30% and blast furnace slag with 60% were incorporated in OPC to fabricate high volume admixture concrete with 0.5 of W/B. Emulsified refining cooking oil(ERCO) was made by mixing WCO and emulsifying agent to improve fluidity. ERCO was replaced by cement from 0.25 to 1.0%. As results, the increase of ERCO resulted in decrease of slump and air contents. For compressive strength, the use of ERCO led to decrease the compressive strength at 28 days, while it had similar strength or much higher strength than plain concrete at 180 days. Resistance to carbonation and chloride penetration was improved with the increase of ERCO contents due to decreased pore distribution by saponification between ERCO and concrete, while freeze-thaw resistance was degraded due to air loss.
유화처리 정제식용유가 혼화재 다량치환 콘크리트의 공학적 특성에 미치는 영향
한민철(Han, Min-Cheol),우대훈(Woo, Dae-Hun) 대한건축학회 2013 大韓建築學會論文集 : 構造系 Vol.29 No.9
This paper is to investigate experimentally the effect of the use of waste refined cooking oil(ERCO) on the engineering properties of the high volume admixture concrete. Fly ash and blast furnace slag were replaced by cement by as much as 30% and 60%, respectively. Fresh properties, strength development, accelerated carbonation and porosity by mercury intrusion penetration methods were tested under various dosages of ERCO. It showed that an increase of ERCO resulted in reduction of slump and air contents, and compressive strength also showed declining tendency. Test results also indicated that the incorporation of ERCO led to enhance the carbonation resistance of the high volume admixture concrete due to saponification reaction between fat acid in ERCO and Ca(OH)₂. Based on MIP observation, the use of ERCO can fill the capillary pore, which contributes to reduce the amount of total pore volume.
내구성 증진용 혼화제(DIA) 치환율 변화에 따른 보통 콘크리트의 기초적 특성
김영희(Kim Young-Hee),한상윤(Han Sang-Yoon),우대훈(Woo Dae-Hun),전충근(Jeon Chung-Keun),한민철(Han Min-Cheol),한천구(Han Cheon-Goo) 대한건축학회 2011 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.31 No.2(구조계)
The aim of this study is to investigate the fundamental properties of concrete containing chemical admixture for the improvement of concrete durability (DIA). Results showed that increasing the addition of DIA contents slightly decreased the slump and compressive strength of concrete, but greatly resisted the carbonation of concrete. Hence, it can be concluded that the use of DIA can improve not only the reduction of autogeneous shrinkage of high-performance concrete but also durability of ordinary concrete.