| Popis: |
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. |
