Comparative study on Steel fibre reinforced Cum control concrete under flexural and deflection
Fibre reinforced concrete, a composition of concrete and fibres is being prominently used for various important applications. The hook tain steel fibres assist in controlling the propagation of micro-cracks present in the matrix, first by improving the overall cracking resistance the matrix and later by bridging across even smaller cracks formed after the application of load on to the member thereby preventing there widening into major cracks. In the present paper, the effect of steel fibre reinforcement with different percentage of fibre 0, 1%, 2% and 3% by volume for M-40 grade of concrete with aspect ratio 50, 60 and 67 are studied. The beam is tested for flexural strength. The percentage increase through utilization of steel fibers is reported. A relationship between aspect ratio vs. flexural strength represented graphically.
Flexural behaviour of steel fiber reinforced high strength rice husk ash cement concrete simply supported beams
The experimental programme was designed to study the flexural behaviour of simply supported beams cast with steel fiber reinforced high strength rice husk ash cement concrete. The variables in the study are Volume of steel fibers and longitudinal reinforcement. Twelve rectangular reinforced concrete beams are cast and tested under two-point loading. Moments and curvatures are calculated from the experimental data and the Moment-curvature diagrams are presented in this paper. From the experimental data, it is observed that the addition of steel fibers made the RC sections to behave in a ductile manner even if the sections are over reinforced.
Shear Strength of Beams with Deformed Steel Fibers
(ACI 318-052) requires minimum shear reinforcement in the form of stirrups or hoops in beams when the factored shear force Vu exceeds 0.5φVc. Here, φ is the strength reduction factor for shear and Vc is the nominal shear strength provided by concrete. In most cases, Vc is taken as 0.17 √ f ′ c bwd (2 √ f ′ c bwd ), where d is the effective depth of the beam. Besides providing shear strength through truss action Vs, the addition of minimum shear reinforcement helps control diagonal crack widths and fosters a more uniform distribution of diagonal cracks in the beam webs. Thus, for a given average state of strain, members with minimum shear reinforcement exhibit smaller crack widths and an increase in shear resistance provided by aggregate interlock compared to members without web reinforcement. This is particularly important in large members, where the so-called “size effect” might lead to shear strengths lower than the concrete contribution given in ACI 318.3 Although shear reinforcement in beams typically consists of steel bars bent in the form of stirrups or hoops, the addition of deformed steel fibers to the concrete has also