Assessment of Self-Consolidation Concrete Produced with Micro Steel and Macro Synthetic Polyolefin Fibers

Abstract

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.