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.
MECHANICAL PROPERTIES OF STEEL FIBER REINFORCED RAPID-SET MATERIALS
This paper presents an experimental program designed to study the mechanical properties of rapid-set materials reinforced with steel fibers. The primary variables of this study are: (a) rapid-set cementing materials; (b) fiber type; and (c) fiber content. Three commercially available rapid-set materials were investigated. Four fiber types made of low-carbon steel were incorporated in this study. Two were hooked at the ends, one was crimmped at the ends, and one was crimped throughout the length. Steel fibers were added in the quantitites of 50, 75, and 100 lb/cu yd. The findings show that steel fibers can be successfully mixed with rapid set materials up to a quantity of 75 lb/cu yd. The mechanical properties enhancement depends on the fiber shape, aspect ratio, and content.
Behavior of Reinforced Fiber Concrete Deep Beams in Shear
The complete load-deformation response of reinforced fiber concrete deep beams in investigated both analytically and experimentally. The softened truss model theory for nonfibrous concrete has been modified using new stress-strain relationships for fiber concrete, and a series fo tests was carried out to generate relevant information. Test results indicate that including discrete fibers in concrete significantly improves the strength and deformation characteristis of deep beams. A comparison of test results with theoretical predictions of the load-deformation response shows very good agreement for the entire range of loading.