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혼화재 및 폴리프로필렌섬유의 사용에 따른 콘크리트의 품질변화에 대한 기초적 연구
김정섭,손순채,조창호,최진석,김민국 朝鮮大學校 建設技術硏究所 2001 建設技術硏究 Vol.21 No.1
This study is to identify the effect of using admixture and polypropylene fiber on the quality of concrete. The results of the changes in the quality of concrete that has not yet hardened and concrete that has hardened is as follows: 1. Depending on the proportions of admixture, the greater the fly ash content and the lower slag and silica fume, the greater the slump. Admixture and polypropylene together contributed to increased slump. 2. The more fly ash, slag and silica fume added, the less the air. 3. After 360 days of age, greater fly ash content contributed to a lower compressive strength, while greater slag added to higher compressive strength. Silica fume shows a high compressive strength when 10% of silica fume was added on the 360th day of age. 4. Tensile Strength at 360 days of age, the less fly ash and the more slag, the higher the tensile strength. Silica fume at 360 days of age increase strength when the mixing proportion was 30%. 5. The more fly ash and the less slag and silica fume that were mixed, the greater the fire resistance. When added to and polypropylene fiber, the fire resistance of concrete of no effect. 6. The more fly ash and silica fume, the more carbonation shown and when there was only 10% slag present, the neutralization was also shown.
先加力 후 補修-補强한 鐵筋콘크리트 壓縮部材의 構造特性에 관한 實驗的 硏究
신용석,최진석,김판선,조철희,손순채,김정섭 대한건축학회 2003 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.23 No.2(구조계)
This study examined the Stress and structural characteristics of reinforced concrete compressive member repair and strengthening by CFS and GFS after pre-loading. The following results were obtained. The results of compressive testing by the kind of fiber suggested that: In CFS, Specimen increased by about 26.9% and strengthening after pre-loading, by about 111.8%, compared with after strengthening, In GFS, Specimen increased by about 69.0% and repaired and models after pre-loading, by about 76.7%, compared with after strengthening. In the compressive testing, strengthen with CFS-Specimen showed a brittle fracture and strengthen with GFS-Specimen represented ductile fracture. More increasing in stress of Specimen, and repair and Strengthening specimen after pre-loading than loading specimen after strengthening suggested the strengthen effect of fiber.
최진석,조철희,신용석,고송균,손순채,김정섭 대한건축학회 2003 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.23 No.1(구조계)
As a result of separating river sand and sea sand into the corrosion increased according to the of thinnss or the coating and the Chloride Content and Corrosion of Steel Bar through the experiment, the following conclusions are obtained. 1. There was no corrosion in the case of treating the steel bar with anticorrosive among test specimens cured in the air for 60 days, corrosion was found in the test specimens not treated with anticorrosive and for 60 days of age. 2. The area of corrosion increased according to the thinnss of the coating and the chloride content wher exposed for are more than 60 days. Therefore, it was determined in general that the corrosion progressed more rapidly in water cured specimens than in air cured ones and this was due to the influence of C1_( ̄) in the sea sand.
섬유보강 콘크리트의 내화도에 따른 압축강도의 특성에 관한 연구
김민국,최진석,조철희,조창호,손순채,김정섭 대한건축학회 2001 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.21 No.2
This paper is a experimental study to understand the properties of compressive strength according to fire resistance of fiber reinforced concrete mixed with fiber reinforcement. The materials for fiber reinforcement are polypropylene fiber, steel fiber, and cellulose fiber, a natural fiber. Destructive and non-destructive test are conducted to compute the material age classified compressive strength of each reinforced fiber. Fire resistance experiment was conducted by destructive and non-destructive experiment after fire resistance experiments at 300, 600, and 900 degree on 180 days material aged specimen. The conclusions generated by the experiment of compressive strength and fiber resistance according to the material ages of the concrete which is fiber reinforced are as follows: 1) Fiber reinforced concrete presented low strength compared with non-reinforced one from destructive compressive strength test. 2) Fiber reinforced concrete except cellulose fiber generally presented a little bit low strength compared with non-reinforced one from non-destructive compressive strength test. 3) Steel fiber rose 7.8% polypropylene fiber rose 3.2% and sellulose fiber rose 30.5% compared with non-reinforced concrete at 300 degree from destructive compressive strength experiment after fire resistence experiment. Cellulose fiber reinforced concrete was appeared most excellent in fire resistence as 23.6% higher strenth than any other fiber reinforced concrete. 4) Cellylose fiber reinforced conctete rose 14.6% compared with fiber non-reinforced concrete from the non-destructive compressive strength experiment after fire resistence experiment at 300 degree.