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석분슬러지 혼입이 시멘트 모르타르 특성에 미치는 물리적 영향
서준영,최선종,강수태,Seo, Jun-Yeong,Choi, Seon-Jong,Kang, Su-Tae 한국건설순환자원학회 2015 한국건설순환자원학회 논문집 Vol.3 No.2
본 연구에서는 잔골재의 일부 대체재로 석분슬러지의 활용가능성을 살펴보기 위해서, 석분슬러지 활용 시멘트 모르타르에서 석분슬러지 치환율 변화에 따른 굳지 않은 상태 물성과 강도 변화 실험을 수행하였다. 치환율은 0, 10, 20, 30%를 고려하였으며, 굳지 않은 상태 물성으로는 슬럼프, 공기량, 레올로지 특성을 평가하였으며, 강도는 압축강도 및 휨인장강도를 평가하였다. 그 결과, 슬럼프 및 공기량은 석분슬러지 치환율이 증가함에 따라 감소하는 것으로 나타났으며, 레올로지 특성에서는 치환율 20%까지는 항복응력 및 소성점도 모두 증가하는 것으로 나타났지만, 치환율 30%에서는 20%와 큰 차이가 나지 않았다. 항복응력의 경우 10%에서 20% 사이에서 증가율이 크게 나타났다. 압축강도 및 휨인장강도 결과에서는 석분슬러지 치환율에 따른 강도변화는 크게 나타나지 않았지만, 석분슬러지를 혼입할 경우 초기재령에서는 강도증진 효과가 명확히 나타났으며 28일 재령에서는 석분슬러지를 사용하지 않은 경우와 큰 차이가 없는 것으로 나타났다. In order to investigate the feasibility of stone dust sludge as fine aggregate, an experimental study was performed on cement mortar with stone dust sludge. fresh mortar properties and strength with various stone dust sludge replacement ratios were estimated. the replacement ratio adopted in this study was 0, 10, 20, 30%. Flow, air content, and rheological properties were considered as properties of fresh mortar. Compressive strength and flexural tensile strength were measured for strength. The results are as follows. Higher amount of stone dust sludge caused reduction in slump and air content. In the rheological properties, both yield stress and plastic viscosity increased as stone dust sludge content increased up to 20% replacement ratio, but there were no remarkable difference between 20 and 30%. Yield stress increased drastically between 10 and 20%. Compressive and flexural tensile strength results indicated that the strength variation was not significant according to stone dust sludge content, but the strength gain in the early age by adding stone dust sludge was evident. the strength at the age of 28 days however did not show noticeable effect of adding stone dust sludge.
고분자 전해질형 연료전지 기체 확산층(Gas Diffusion Layer)을 통한 물 유동 특성 가시화
진집(Jib Jin),이재석(Jae Seok Lee),최선종(Seon Jong Choi),김한상(Han-Sang Kim) 대한기계학회 2016 대한기계학회 춘추학술대회 Vol.2016 No.12
In a Polymer Electrolyte Membrane Fuel Cell (PEMFC), the effective water management is a one of the important strategies for improving fuel cell performance and efficiency gains. In this study, the improved design in the unit simulated flow field configuration was adopted to study the characteristic of water flow in the flow field channel through the gas diffusion layer (GDL). The previous design has some problems in sealing because it was assembled by four bolts and nuts. It was so difficult to distribute each pressure equally in a water inlet because of the location of water inlet. In the new design of this study, to improve the strength, the location of water inlet was moved to the center of flow field channel. Six bolts and six nuts remain at equal distance in a circular manner were used for more even pressure distribution and better sealing. Water is supplied equally by using a syringe pump with a flow rate of 10μℓ/min and the visualization of water droplet on GDL surface was recorded by a Charge Coupled Device (CCD) camera system. Through the experiment using the newly designed configuration, the appearance and growth of water droplet towards the flow channel through the GDL can be effectively investigated. This study can be used to provide the basic data for an effectual method of removing water from the flow channels of PEMFC.