• Title/Summary/Keyword: Jang suk-sun

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A Fundamental Study on the Properties of Crushed Aggregates Produced in Busan Suburbs (부산근교에서 생산된 부순골재의 특성에 관한 기초적 연구)

  • Bae Won Mahn;Youm Chi Sun;Lee Hwan Woo;Jang Hui suk;Kim Jong Soo;Kim Myung Sik
    • Proceedings of the Korea Concrete Institute Conference
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    • 2004.05a
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    • pp.376-379
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    • 2004

  • The objective of in this study makes investigation into the characteristics of concrete as to properties and blended ratio of crushed aggregates through experimental researches. In this study, river sand is blended with crushed sand as to investigate the quality change and characteristics of concrete with variation of blend ratio of crushed sand(50, 60, 70, 80, 90, $100\%$). Measured the air contents and slump to investigate properties of fresh concrete, and unit weight and compressive strength in age of 7, 28days to investigate properties of hardened concrete. The experimental results of crushed aggregates' qualities were all satisfied with Korea Standard's values.

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The behavior of breakwaters utilizing buoyancy for soft ground (부력을 이용한 연약지반용 방파제의 거동분석)

  • Yun, Hee-Suk;Jang, In-Sung;Kwon, O-Soon;Lee, Sun-Jae
    • Proceedings of the Korean Geotechical Society Conference
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    • 2008.03a
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    • pp.300-310
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    • 2008

  • A series of numerical simulations on the several types of breakwaters on the foundation systems utilizing buoyancy were carried out in plane-strain conditions using the modified Cam-Clay model and the Biot's consolidation theory. Improved foundation system by the replacement of original ground with light weighted material, expandable poly-styrene (called below EPS) and several foundation systems with buoyant cells were used. From the results of numerical simulations we found that the foundation systems utilizing buoyancy are efficient to reduce the maximum consolidation settlements without reducing lateral safety.

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Mixing and Flexural Strength Characteristics of HPFRCCs using Steel Cord and Carbon Fiber (강섬유와 탄소섬유를 사용한 고인성 시멘트 복합체의 비빔 및 휨강도 특성)

  • Lee, Won-Suk;Byun, Jang-Bae;Yun, Hyun-Do;Kim, Sun-Woo;Jeon, Esther
    • Proceedings of the Korea Concrete Institute Conference
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    • 2006.05b
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    • pp.377-380
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    • 2006

  • HPFRCCs(High performance fiber reinforced cementitious composites) is a class of FRCCs(Fiber reinforced cementitious composites) exhibit multiple crack. Multiple crack lead to improvement in ductility, toughness, and deformation capacity under compressive and tensile stress. These properties of HPFRCCs are affected by type of fiber, water cement ratio, type of admixture and rate of substitution. Furthermore these influence dispersion of fiber, mixing performance and fluidity of mixture. In this paper, HPFRCCs made of steel cord and carbon fiber were tested with water cement ratio, type of admixture and rate of substitution to evaluate characteristics of mixing and flexural strength.

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Experimental Study on the Properties of High Performance Fiber Reinforced Cementitious Composite with PP and PE Fiber (PP섬유와 PE섬유를 혼입한 고인성 섬유보강 시멘트 복합체의 특성에 관한 실험적 연구)

  • Byun, Jang-Bae;Lee, Won-Suk;Jeon, Esther;Kim, Sun-Woo;Yun, Hyun-Do
    • Proceedings of the Korea Concrete Institute Conference
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    • 2006.05b
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    • pp.381-384
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    • 2006

  • Fibers are increasingly being used for the reinforcement of cementitious matrix to enhance the toughness and energy absorption capacity and to reduce the cracking sensitivity of the matrix. In the past decade, high performance fiber reinforced cementitious composite(HPFRCC) have evolved with intensified research. HPFRCC for structural applications has been developed under the performance driven design approach. It is the aim of this study to obtain development of hybrid-HPFRCC using polypropylene fibers and polyethylene fibers. It was targeted the requirement of economical mixing and application to structure member.

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