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Title |
Effects of Replacement Ratio and Fineness of GGBFS on the Hydration and Pozzolanic Reaction of High-Strength High-Volume GGBFS Blended Cement Pastes
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Authors |
김상희(Sang-Hee Kim) ; 홍성걸(Sung-Gul Hong) ; 윤현도(Hyun-Do Yun) ; 김규용(Gyu-Yong Kim) ; 강현구(Thomas H.-K. Kang) |
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DOI |
http://dx.doi.org/10.4334/JKCI.2015.27.2.103 |
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Keywords |
고속충격하중 ; 강섬유 ; 와이어매쉬 ; 내충격성 ; 쪼갬부착파괴 high velocity impact load, steel fiber, wire mesh, impact resistance, splitting bond failure |
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Abstract |
High-Velocity Impact Experiment on Impact Resistance of Steel Fiber-Reinforced Concrete Panels with Wire Mesh This paper studies impact performance of wire-mesh and steel fiber-reinforced concrete based on high-velocity impact experiments using hard spherical balls. In this experimental study, panel specimens were tested with various parameters such as steel fiber volume fraction, presence/absence of wire mesh, panel thickness, impact velocity, and aggregate size for the comparison of impact resistance performance for each specimen. While improvement of the impact resistance for reducing the penetration depth is barely affected with steel fiber volume fraction, the impact resistance to scabbing and perforation is improved substantially. This was due to the fact that the steel fiber had bridging effects in concrete matrix. The wire mesh helped minimizing the crater diameter of front and back face and enhanced the impact resistance to scabbing and perforation; however, the wire mesh did not affect the penetration depth. The wire mesh also reduced the bending deformation of the specimen with wire mesh, though some specimens had splitting bond failure on the rear face. Additionally, use of 20 mm aggregates is superior to 8 mm aggregates in terms of penetration depth, but for reducing the crater diameter on front and back faces, the use of 8 mm aggregates would be more efficient.
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