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조일호,성찬용,Cho, Il Ho,Sung, Chan Yong 한국농공학회 2013 한국농공학회논문집 Vol.55 No.3
This study was performed to evaluate the slump flow, air content, setting time, compressive strength, adiabatic temperature rise and diffusion coefficient of chloride used ordinary portland cement, crushed coarse aggregate, crushed sand, river sand, fly ash, limestone powder, blast furnace slag powder and superplasticizer to find optimum mix design of low carbon green concrete for structures. The performances of low carbon green concrete used fly ash, limestone powder and blast furnace slag powder were remarkably improved. This fact is expected to have economical effects in the manufacture of low carbon green concrete for structures. Accordingly, the fly ash, limestone powder and blast furnace slag powder can be used for low carbon green concrete material.
조일호,성찬용,Cho, Il Ho,Sung, Chan Yong 한국농공학회 2013 한국농공학회논문집 Vol.55 No.6
This study was performed to evaluate the chlorine ion penetration resistance, chemical resistance and freezing and thawing resistance used ordinary portland cement, crushed coarse aggregate, crushed sand, river sand, fly ash, limestone powder, blast furance slag powder and superplasticizer to find optimum mix design of low carbon green concrete for structures. The performance of low carbon green concrete used fly ash, limestone powder and blast furnace slag powder were remarkably improved. This fact is expected to have economical effects in the manufacture of low carbon green concrete for offshore structures. Accordingly, the fly ash, limestone powder and blast furnace slag powder can be used for offshore structure materials.
플라이 애시와 석회석 미분말을 혼용한 고유동 콘크리트의 유동 특성
조일호,성찬용,Cho Il-Ho,Sung Chan-Yong 한국농공학회 2006 한국농공학회논문집 Vol.48 No.4
This study is performed to evaluate flowability of high flowable concrete using ordinary portland cement, crushed coarse aggregate, crushed sand, sea sand, fly ash, lime powder and superplasticizer. The slump flow and air content are increased with increasing the content of lime powder. But, the O-type funneling time and Box-type passing are decreased with increasing the content of lime powder. The slump flow, air content, O-type funneling time, Box-type passing and L-type filling of target compressive strength 21-27 MPa and 35-42 MPa at curing age 28 days are 47-50 cm and 56-60 cm, 4.2-5.5% and 4.0-5.7%, 8-12s and 5-10s, 4.3-5.0 cm and 3.4-5.0 cm, and excellent, respectively. These concrete can be used for high flowable concrete.
조일호 ( Cho Il Ho ),성찬용 ( Sung Chan Yong ) 한국농공학회 2006 한국농공학회 학술대회초록집 Vol.2006 No.-
In this research, deals with the time dependence of fluidity and early strength of low heat mixed polycarboxylate based superplasticizer. It was measured through the curing early age 1 8~32hr and variation of slump flow and air content according to elapsed time. The test results was pump pressure of low heat concrete with slump of 22cm is higher than that of normal strength concrete with slump of 18cm by about 20~30%. The measured average 28days compressive strength of the concrete is 40MPa and the coefficient of variation is 2.3%. Also, it shows that viscosity and early strength can be increased by polycarboxirate. Heat of hydration was measured through various gages and analysis considering the steps of concrete placement were carried out.
조일호 ( Cho Il-ho ),성찬용 ( Sung Chan-yong ) 한국농공학회 2005 한국농공학회 학술대회초록집 Vol.2005 No.-
In this research, the physical properties of fresh concrete using lime stone powder as a part of cement were investigated. Fresh concrete using lime stone powder was prepared with various lime stone powder replacement(< 5~12 volume %) for cement and the quantities of sand aggregate ratio in concrete were 47.3%, 48.5% and 49.4% of ratio of sand aggregate. The workability, flowing characteristics, air content and bleeding of concrete using lime stone powder were tested and the results were compared with those of ordinary portland cement concrete. In the experiment, we acquired satisfactory results at the point of fresh concrete characteristics using lime stone powder within the replacement ratio of 8%~12% and the optimum quantity of sand aggregate ratio in concrete was found to be 48.5%~50% of ratio of sand aggregate.
조일호 ( Cho Il Ho ),민정기 ( Min Jeong Ki ),윤준노 ( Youn Joon No ),김영익 ( Kim Young Ik ),성찬용 ( Sung Chan Yong ) 한국농공학회 1999 한국농공학회 학술대회초록집 Vol.1999 No.-
This study is performed to evaluate slump, air content, compressive strength and length change ratio of non-shrinkage high strength concrete. The following conclusions are drawn; According to increase of expansive additive contain ratio, the slump is decreased and air content is increased. Highest compressive strength of non-shrinkage high strength concrete is achieved by 10% expansive additive contained. The length change ratio of non-shrinkage high strength concrete which is in water curing, shows 0.055% expansion in 10% expansive additive contained concrete and 0.308% expansion in 20% expansive additive contained concrete when it is curing 28 days.
고로슬래그 미분말과 석고를 사용한 저발열 콘크리트의 특성
조일호 ( Cho Il-ho ),김영익 ( Kim Young-ik ),성찬용 ( Sung Chan-yong ) 한국농공학회 2002 한국농공학회 학술대회초록집 Vol.2002 No.-
This study is performed to properties of low heat concrete using blast furnace slag powder and gypsum. The test result shows that the air content is in the range of 4.1% ~ 5.1%, the unit weight is in the range of 2,306kg/㎥ ~ 2,334kg/㎥. The compressive strength of concrete mixed blast furnace slag(BFS) low than ordinary portland cement(OPC) at the curing age of 7days, but it is high or same at the curing age of 28days. And the natural gypsum shows superior compressive strength than the chemical gypsum.
조일호 ( Cho Il Ho ),성찬용 ( Sung Chan Yong ) 한국농공학회 2007 한국농공학회 학술대회초록집 Vol.2007 No.-
In this research, owing to the development of industry and improvement of building techniques, concrete structures are becoming larger and higher. This study investigates the thermal properties of concrete according to several binder conditions, such as OPC, Belite rich cement, slag powder, limestone powder and flyash added cement. To investigate effects of PC type terpolymers on the hydration of cement, experiments involving FT-IR, XRD, DSC, SEM have been analysed with cement paste specimens to 1, 3, 28 day. The hydration reaction rate of cement paste was slightly delayed at 1day, due to increase in molar ratio of PC type. It is more effective to use mineral admixture. Especially, to be used blast furnace slag and fly ash added cement is more effective.
조일호 ( Cho Il-ho ),성찬용 ( Sung Chan-yong ) 한국농공학회 2008 한국농공학회논문집 Vol.50 No.2
Recently, owing to the development of industry and improvement of building techniques, concrete structures are becoming larger and higher. This study was performed to analyze hydration reation properties of concrete with binders and admixtures, such as OPC, low heat cement, belite rich cement, slag powder, lime powder and fly ash. To investigate effects of PC type superplasticizer on the hydration, experiments involving FT-IR, XRD, DSC, SEM were analyzed at the curing age 1day, 3days and 28days. The hydration reaction rate of OPC concrete slightly delayed at the curing age 1day, blast furnace slag powder and fly ash were more effective. BRC and LHC concretes can be used for concrete structures in winter season.