• Proceedings of the Materials Research Society of Korea Conference
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• 1997.05a
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• pp.73-73
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• 1997

• Proceedings of the Korean Fiber Society Conference
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• 2000.04a
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• pp.229-232
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• 2000

• Proceedings of the Korea Concrete Institute Conference
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• 2009.05a
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• pp.243-244
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• 2009

Fibers reinforced concrete(FRC) has abilities to make up for brittleness fracture as one of the material characteristics of concrete. However, being mixed with steed fibers in concrete mixes could set off a "Fiber Ball". The Fiber ball formation could be one of the main reasons to decrease the quality of Fibers reinforced concrete. In order to eliminate the fiber ball formation and improve the deficient flowablitiy, The necessity of research for fiber reinforced self-compacting concrete(FRC-SCC) should be raised.

• Proceedings of the Korea Concrete Institute Conference
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• 2010.05a
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• pp.407-408
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• 2010

This study investigated fire resistance performance for ultra-high-strength concrete columns reinforced with various fibers such as polypropylene, nylon, and steel fibers. 24 small size column specimens were tested with standard heating curve of KS F 2257-1 for 3 hours. The main parameters were the aggregate types, the length of polypropylene fibers, and the content ratios of each fiber.

• Proceedings of the Korean Institute of Building Construction Conference
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• 2007.11a
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• pp.15-18
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• 2007

The purpose of this study is to suggest a reference for an extensive evaluation about effectiveness of four types of fibers to control plastic shrinkage crack of concrete. So in this study for the practical use in construction field, the plastic shrinkage cracks shown from four types of concrete reinforced by mixing four types of fibers are quantitatively evaluated in points of the workability and compressive strength. Test showed that the mixing of Cl, N, P fibers except for C2 fibers decreased fluidity of fresh concrete. Compressive strengths of four types specimens were similar. Plastic shrinkage cracks were reduced by mixing each fiber, especially C2 fibers was very effective to prevent the plastic shrinkage crack. Therefore the reinforced concrete mixed with C2 fibers exhibited superior mechanical performance than the others.

• Proceedings of the Korean Institute of Building Construction Conference
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• 2020.11a
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• pp.155-156
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• 2020

The purpose of this study is to evaluate tensile performance of cementitious composites reinforced with steel fiber. The tensile performance of steel fiber reinforced cementitious composites is related to the tensile performance of reinforced fiber, and depends on the fracture or pull-out of fiber. Therefore, the tensile performance was compared and analyzed by conducting a direct tensile test on the tensile specimens of cementitious composites reinforced with hook-type steel fiber and amorphous steel fiber.

• Journal of Korean Tunnelling and Underground Space Association
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• v.20 no.2
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• pp.469-483
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• 2018

Steel bars have been widely used as the primary reinforcement for Precast Segmental Concrete Lining for TBM Tunnels. Previously, studies have been carried out to gauge the potential for steel fiber reinforcement to replace the use of steel bar reinforcements in the segmental lining to reduce the amount of the steel bar reinforcement. Steel fiber reinforcements have been investigated and widely applied to SFRC TBM linings to improve the constructability of SFRC TBM linings worldwide. However, the steel fiber reinforcement often caused punctures to the water membranes inside tunnel lining and had long-term durability deterioration issues caused by steel corrosion, as well as cosmetic problems. Therefore, this paper sought to gauge the potential of synthetic fiber reinforcements, which have proven to be very attractive substitutes for steel fiber reinforcements. This study analyzed the performance of both steel and synthetic fiber reinforcements in segmental linings and evaluated the applicability of the fiber reinforcements to the TBM Precast Concrete Segmental Linings of TBM tunnels. As a conclusion, this study demonstrates that the potential use of steel and synthetic fibers in various combination, can substitute the rebar reinforcement in the concrete mix for segmental concrete linings.

• Journal of the Korean GEO-environmental Society
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• v.4 no.4
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• pp.85-96
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• 2003

The Geocell system is the advanced system of Geo-grids, and is one of geosynthetics used for earth reinforcement of weak soil. It is the way to increase earth strength and bearing capacity by using three dimension type of geo-composite. This paper analyzed the bearing capacity mechanism of Geocell system for earth reinforcement. Plate loading tests under the model laboratory condition were performed, and the increase of bearing capacity and the decrease of settlement with shallow foundation were evaluated.

• Proceedings of the Korea Concrete Institute Conference
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• 2010.05a
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• pp.9-10
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• 2010

In this study, the static and low velocity impact tests for two-way concrete specimens strengthening with the CFRP sheets were carried out. The specimens that had a dimension of $50{\times}350{\times}350mm$ with 40 MPa plain concrete and steel fiber reinforced concrete which had same mixture to plain concrete and 0.75% steel fibers were fabricated. The specimens reinforced with the CFRP or steel fibers showed mixed failure modes, splitting and punching, also splitting cracks and fragments were much reduced than plain concrete specimens'. Two-way concrete members reinforced with the CFRP and steel fiber simultaneously dissipated 6.8 times larger energy than not-retrofitted members' under the low-velocity impact loading.

• Proceedings of the Korean Society of Tribologists and Lubrication Engineers Conference
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• 1998.04a
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• pp.64-68
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• 1998

본 연구에서는 다양한 종류의 섬유를 일방향으로 배향시켜 제작한 복합재료의 트라이볼로지 연구를 수행하였으며 특히 섬유의 배향과 활주속도가 트라이볼로지 성질에 미치는 영향을 연구하였다. 실험에 쓰인 시편은 유리 섬유, 아라미드 섬유, 그리고 고탄성 탄소 섬유를 보강재료로 에폭시 수지를 모재로 사용한 일방향섬유 복합재료이며 각각의 시편을 스테인레스 강 상대 마찰면에 마찰시켜 마모량과 마찰 계수를 구하였다. 실험조건으로 사용한 여러 활주속도에서 탄소섬유복합재료가 모든 섬유배열방향에서 아라미드섬유복합재료와 유리섬유 복합재료보다 마모율과 마찰계수가 낮은 경향을 보였으며 특히 높은 속도에서는 탄소섬유복합재료의 특성이 뛰어남을 알 수 있었다.