In the field of precast concrete, the utilize of fiber reinforced self-consolidation concrete (SCC) has big potential as it can be supplied directly into the molds without any effort for vibration or compacting. Likewise, depending on the design requirements, it has the potential to supplant conventional steel reinforcement. The using of one type of fiber in producing of SCC has been usual. Fiber reinforced self-consolidation concrete (FSCC) contains two type or more of fiber can improve the mechanical properties and may cause performance synergies. This paper investigates the combination of fibers, often referred to as hybridization, for a cementitious matrix. Control, single, two hybrid fibers were cast using different steel and macro synthetic fibers ratios. Fresh behavior, such as the ability to flow and fill and the tendency to segregate, was evaluated by a special SCC test based on its specifications. Moreover, compressive strength, splitting tensile strength, flexural strength, ductility, toughness, and the load - deflection relationship were determined to assess the hardened behavior. The results showed that the compressive strength of hybrid fiber mixes slightly improved. The increment in splitting and flexural strength for hybrid mixes was (60 and 58) % respectively. Also, these hybrid fiber mixes represent a more ductile failure further, the high toughness index, which reaches to 45% of control mix.
Slurry infiltrated fibrous concrete (SIFCON) is a form of superior performance fiber reinforced concrete made by penetrating steel fiber bed with an exceptionally designed slurry of cement-based. Researches have demonstrated that SIFCON is an imaginative building material having both extensive ductility and high strength. In the current study, the use of SIFCON has been investigated as a strengthening layer for conventional concrete section. The effects of the SIFCON layer position (bottom, top & bottom, and jacket), thickness (1.5, 2.5, and 3.5) cm, and steel fiber volume fraction (6, 7.5, and 9) % on the flexural strength, toughness, and ductility of hybrid prisms were reported. The results showed that the increase in thickness of the SIFCON layer and the steel fiber volume fraction improves load bearing capacity, toughness, and ductility of the composite sections. The maximum ductility and load carrying capacity achieved from the jacketing case. Also, the toughness enhanced greatly in the case of jacketing composite section, it was 23 times higher than that of control prisms.
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