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Title |
Flexural and Workable Properties of High Performance Hybrid Fiber Reinforced Concrete
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Keywords |
하이브리드 섬유보강 콘크리트; 매크로/마이크로 섬유; 유동성; 파괴계수; 휨인성; hybrid fiber reinforced concrete; macro/micro fiber; workability; MOR; flexural toughness |
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Abstract |
In the present work, modulus of rupture (MOR), flexural toughness properties (I30 and W2.0) and workability (slump) of high performance hybrid fiber reinforced concrete (HPHFRC) mixed with micro-fiber (carbon fiber) and macro-fiber (steel fiber), and replaced with a fine mineral admixture such as silica fume (SF) are characterized through the analysis of variance (ANOVA). Data of MOR, I30 (or W2.0)and slump are used as the characteristic values to estimate flexural performance and workable property of HPHFRC. Specially, an experimental design was Planned according to the fractional orthogoanl nay method to reduce experimental number of times. The experimental results show that steel fiber is a considerable significant factor in MOR and I30(W2.0). Based on the significance of experimental factors about each characteristic factors, the following evaluation can be used: Experiment factors which reduce slump most remarkably are carbon fiber, steel fiber, silica fume order.; Those that improve MOR most significantly are silica fume (≒carbon fiber), steel fiber order; Those that increase flexural toughness most distinctly are silica fume, carbon fiber, steel fiber order. It is obtained that the combination of steel fiber 1.0%, carbon fiber 0.25% and silica fume 5.0% is the experimental condition that improve MOR and flexural toughness excellently with workability ensured within the experiment.
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