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Title |
Effect of Reinforcing Fiber Types on Lap Splice Performance of High Performance Fiber Reinforced Cementitious Composite(HPFRCC)
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Keywords |
겹침이음 ; 고인성 시멘트 복합체 ; 하이브리드 섬유 ; 미세균열 ; 가교작용 lap splice ; high performance fiber reinforced cementitious composite(HPFRCC) ; hybrid fiber ; multiple crack ; bridging |
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Abstract |
This paper investigates the lap splice performance of structural steel bars embedded in high performance fiber reinforced cementitious composite(HPFRCC) with various matrix ductilities. Matrix ductility is governed fiber type and fiber volume fraction. Fiber types were polypropylene(PP), polyethylene(PE) and hybrid fiber[polyethylene fiber + steel cord(PE + SC)]. The lap splice length(ld) was calculated according to the relevant ACI code requirements for reinforcing bars in normal concrete. As the result of tests, lap splice strength of HPFRCC using PE1.5 and hybrid fiber increased by up to 82~91 percent more than that of concrete. Splice strength and energy absorption capacity of PE0.75 + SC0.75 or PE1.5(fiber volume fraction 1.5%) specimen increased more than that of P2.0(fiber volume fraction 2.0%) specimen. Therefore lap splice performance depends on fiber tensile strength and Young's modulus more than fiber volume fraction. Also, HPFRCC appear multiple crack and ductile postpeak behavior due to bridging of fiber in cementitious composite
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