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- 저자 : 노성열(No Seong-Ryeol) (검색결과 6 건)
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섬유 혼입 순환골재 콘크리트의 역학적 특성에 관한 연구
노성열(No Seong-Ryeol),신용석(Shin Yong-Seok),김대성(Kim Dae-Seong),유명환(Yoo Myung-Hwan),김정섭(Kim Jeong-Sup) 대한건축학회 2009 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.29 No.1(구조계)
The rate of recycling using recycled concrete which occupies most of construction wastes is increasing. But, negative recognition from inferior quality of recycled aggregates and lower grade of compressive strength, bending strength, frost resistance and ductility make application of recycled aggregates to structure insufficient. Therefore, this study conducted material and member experiments by mixing fiber for the purpose of improving the properties of recycled aggregate concrete and the results of the study are suggested. To synthesize the experimental results, it was found that the specimen with 30% of steel fiber admixture had compressive strength, tensile strength and frost resistance equivalent to or higher than the standard specimen and 30% of replacement of recycled aggregates is applicable to actual structure. But the specimen of 60% recycled aggregate with fiber admixture didn't achieve improvement of brittle destruction in shear test unlike 30% specimen and it is difficult for it to apply to actual structure. Also sustaining study on the replacement of 40% or more of recycled aggregate is necessary.
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전통 목구조 팔작지붕 추녀부재의 구조적 보강 특성에 관한 연구
조철희(Cho Cheol-Hee),신용석(Shin Yong-Seok),조윤희(Cho Youn-Hee),노성열(No Seong-Ryeol),김정섭(Kim Jeong-Sup) 대한건축학회 2010 大韓建築學會論文集 : 構造系 Vol.26 No.3
These studies experimentally investigates structural behavior and reinforcing effects by strengthening the Carbon Fiber Bar overhanging length ratio of hip rafter in hipped-and-gabled roof house as follows. 1) As a result of hip rafter member test, it is found that reinforced specimen shows increased yield load by 4.1%~45.8%, and ultimate load than non-reinforced standard specimen depending on the ratio of overhanging length by 0.6%~47.7%. Also, in yield load, based on the ratio of overhanging length increases, load shows decrease of 6.7%~32.2% in standard specimen and of 5.1%~19.7% in reinforced specimen. 2) As a result of comparing standard specimen to reinforced specimen according to the ratio of overhanging length of hip rafter, Ductile Coefficient shows increase in reinforced specimen of Ⅰ-Type (1:1.0) by 17%~26%, but Ductile Coefficient of standard specimen and reinforced specimen in Ⅱ-Type (1:1.2) and Ⅲ-Type (1:1.4) were similar. As a result of experiments and analysis with hip rafter member in traditional wooden structure, proposed retrofitting method with encased Carbon Fiber Bar is more rational than existing reinforcement methods such as slide installation, steel band reinforcement, plastering mud on the ceiling and core load adjustment and putting stone in the inside considering archetype preservation, structural safety and durability of cultural properties.
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반발경도법에 의한 혼화재 및 섬유사용 콘크리트의 압축강도 추정
김정섭,신용석,노성열,김정훈 朝鮮大學校 建設技術硏究所 2007 建設技術硏究 Vol.27 No.2
This study aims to estimate strength approximate to actual concrete strength by presenting appropriate rebound method strength estimation expression with admixtures (fly ash, blast furnace slag, silica fume) which are used as cement substitute and polypropylene fiber and steel fiber and owing to their s of cement owing to their equal conditions to blending characteristics of concrete used for domestic structures and their recyclable properties. In case of rebound hammering, equation by Japanese Architecture Society was estimated 26~40% higher than destructive strength and remaining suggested equation was estimated 2%~18% lower. In case of ultrasound velocity, equation by Japanese Architecture Society was estimated 4%~11% higher than destructive strength till 60 days of age, but as age progresses, is estimated to 15% lower than destructive strength and remaining suggested equation was estimated 3%~27% lower than destructive strength in almost age. In case of complex methods, all suggested equations were estimated to 24%~94% higher than destructive strength. Since application of existing expression of normal concrete against concrete using admixtures and fiber causes error rate, this study suggests the following estimation expression depending on the kind of admixtures and fiber of concrete using them and position of non-destructive experiment. C-N f_(cu)=1.6R-25.43(R²=0.90), C-FA f_(cu) = 1.07R-8.76 (R²=0.82), C-BF f_(cu)=1.46R-23.09(R²=0.92) C-SF f_(cu) = 1.55R-22.96(R²=0.89), C-PP f_(cu) = 1.16R-12.24(R²=0.73), C-S f_(cu)=0.99R-8.07(R²=0.86)
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순환골재를 사용한 콘크리트 보의 구조적 특성에 관한 연구
김정섭,신용석,노성열 朝鮮大學校 建設技術硏究所 2007 建設技術硏究 Vol.27 No.1
This study identified materials and dynamic characteristics of reclaimed aggregates affecting reinforced concrete through materials and supplementary tests to use broken red bricks and waste concrete as substitutes of concrete and obtained the following results. As a result of the bending specimen test according to types of reclaimed aggregates, it was found that when normal concrete was compared with reclaimed concrete. RBA 30% specimen showed 99-104% of yield load and RCA 30% specimen showed 102-104% of yield load, which were the yield load and the largest yield load of normal concrete. Therefore, it is believed that RBA 30% and RCA 30% specimens has almost similar bending strength to ormal concrete. To sum up the results of material and supplementary tests, the mixed aggregates showed almost the same compressive strength and bending strength compared to that of normal concrete when 30% of broken red bricks and waste concrete were mixed. So this study suggests that they can be applied as thick aggregates.
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초음파속도법을 이용한 혼화재 및 섬유 사용 콘크리트의 압축강도 추정에 관한 연구
김정섭,신용석,노성열 朝鮮大學校 建設技術硏究所 2007 建設技術硏究 Vol.27 No.1
This study aims to estimate strength approximate to actual concrete strength by presenting appropriate non-destructive strength estimation expression with admixtures such as fly ash, blast furnace slag and silica fume which are used as cement substitute and polypropylene fiber and steel fiber and owing to their s of cement owing to their equal conditions to blending characteristics of concrete used for domestic structures and their recyclable properties. In case of ultrasound velocity, equation by Japanese Architecture Society was estimated 4%~11% higher than destructive strength till 60 days of age, but as age progresses, i is estimated to 15% lower than destructive strength and remaining suggested equation was estimated 3%~27% lower than destructive strength in almost age. As a result of comparing error rates between conventional suggested equations and this estimation equations, there are a little differences by age, but error rate of this study was reduced to 0.6%~18.6% by ultrasound velocity method and it is judged that it is desirable to be used for concrete using admixture and fiber
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