Characterization of High Strength Steel Fiber Reinforced Concrete and Self- Consolidating Concrete Mixtures with Various Steel Volume Fractions for Infrastructures

摘要

The intent of the study is to incorporate discrete, short, mechanically deformed, small diameter steel fibers into high strength concrete (f' c > 69 MPa) in an attempt to eliminate or reduce the need for steel rebar in concrete construction. This paper presents the rheological properties and behavior of high strength steel fiber reinforced (SFR) / self-consolidating (SFRSC) concrete mixture with different dosages of steel fibers, ranging from zero to 2% by volume in 1% increments. The effect of high range water reducing agent (HRWR) and viscosity modifying agent (VMA) on the fresh properties of SFRC/SCC are studied. Concrete mixtures include fly ash and silica fume. The fresh properties studied are: the flow-ability (spread diameter), the pass-ability (J-Ring and U-Box test) and fill-ability (V-Funnel test). The study shows that, the addition of steel fibers to the mixture results in the reduction of flow-ability, pass-ability, fill-ability and workability, which was mitigated through the adjustment of HRWR and VMA dosage.