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고분말도 플라이애쉬를 사용한 모르타르의 공학적 특성에 관한 실험적 연구
노영섭(Rho Young-Seob),노형남(Rho Hyoung-Nam),김주상(Kim Ju-Sang),최세진(Choi Se-Jin),이상수(Lee Sang-Su),송하영(Song Ha-Young) 대한건축학회 2007 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.27 No.1
In case of using fly ash as some substitutes of cement, it is possible for us to improve durability through the improvement of liquidity and enhancement of water-tightness according to the effect by the ball bearing of mortar and concrete. It is widely used because it is very effective of decreasing the crack of concrete and improving the long-time strength through the decrease of heat of hydration, etc. However, it is severe in quality variation by the use of reckless substitutes, and it has large congelation retard, so there are disadvantages like the deterioration of performance on mortar and concrete due to the decrease of early strength. Accordingly, as a result of analyzing the strength, characteristics of congelation, and heat of hydration, etc. in order to examine the engineering properties of mortar using fly ash with high fineness in this study, this researcher could get excellent performance on the improvement of early strength and characteristics of heat of hydration according to the acceleration of congelation by the high fineness.
부순모래를 사용한 초고강도 콘크리트의 공학적 특성에 관한 연구
이상수,노형남,송하영,Lee, Sang-Soo,Rho, Hyoung-Nam,Song, Ha-Young 한국건축시공학회 2008 한국건축시공학회지 Vol.8 No.4
Recently, the demand of ultra high-rise building is on the increase in korea due to the rapidly changing movement in economic growth and the expansion of national infrastructure. At the same time, the tendency toward the amount used of concrete has greatly increased every year. In addition, as the seriousness of quantity demanded of aggregate is gathering strength, the active areas of research proceeds to do actively in every place in order to review the usability of crushed sand as a part of the countermeasures. And, it needs to establish the quality standard and service guide, etc. for the practical use. Accordingly, this study was to establish the ratio of water-binder materials as three levels like 23.5, 27.5, and 31.5%, and the replacement ratio as three levels like 0, 50, and 100% in order to define the engineering properties of ultra high-strength concrete using the crushed sand. This study was to examine it after establishing the combined condition by the substitute of the fine aggregate percentage and admixture. From the result of this research above, it may be summed up as follows. 1) The more the replacement ratio of crushed sand and the ratio of water-binder materials increased, the mon the fluidity decreased due to the decrease of irregular grain shape of sand and unit combined discretion. 2) This study found out that 100% of replacement ratio of crushed sand was almost similar level to the compressive strength of concrete using the natural sand.
High Volume Fly-ash를 사용한 모르타르의 품질특성에 관한 실험적 연구
이상수(Lee Sang-Soo),노형남(Rho Hyoung-Nam),송하영(Song Ha-Young) 대한건축학회 2008 大韓建築學會論文集 : 構造系 Vol.24 No.8
While the super high-rise building is gathering strength all over the world recently the admixture applied to the ultra high strength concrete is recognized as essential materials. In particular, the research on fly-ash, industrial waste, has been carried out actively from the past, but its usage rate is on the decrease remarkably due to the degradation of early strength and irregular changes in quantity. After all, as a result of experiment by solving such problems and determining the plan for increasing the usage rate of fly-ash, Regardless of fly-ash fineness, this study has found out that the more the replacement rate increased, the more the fluidity of mortar improved. As the fineness increased, it found out that the setting acceleration arose. In addition, as the replacement rate increased regardless of fly-ash fineness, it appeared the decreased of heat of hydration regularly. Whereas the more the replacement rate between the water-binding material ratio and fly-ash increased, the more the strength decreased. In case of water-binding material ratio 40%, when the replacement rate was 45% in the fly-ash fineness class 6000 and 8000 the strength material age 28 days was more excellent than the plain mortar. This research reaches conclusion that it can be adjustable to around 15% from the limited replacement rate(30%).